eChapters

Abstract

The unique characteristics of mare’s milk help to prevent many chronic diseases. The health beneficial properties of this milk is even acknowledged since ancient time and this milk is being successfully used as medicated food against a wide range of chronic diseases. The merits of mare’s milk has also been noted by the cosmetic and pharmacy industries. Lastly, considering many health beneficial effects of this milk, attempt should be made to augment the production and popularization of mare’s milk. In this chapter different aspects of mare’s milk has been pointed out in different sections and subsections.

Introduction

Globally, 16.9% of milk consumed by humans comes from species other than cattle. Non-cattle milk is linked more to territories than cows’ milk: sheep in the Mediterranean basin, horse in Central Asia, yak in Himalayas, camel in desert regions. The domestic equid species (horse and donkey) belong to the taxonomic order Perissodactyla, family Equidae and genus Equus. The nutritional and therapeutic properties of horse (Equus caballus) milk have been known since ancient times according to the historian Erodoto (V century BC). Although horses are of minor importance for milk production in comparison with cows, buffalo, sheep and goats, they have been traditionally important dairy animals in Mongolia and in the southern states of the former Soviet Union, e.g., Kazakhstan, Kyrgyzstan and Tajikistan. Aristotle (322 BC) reported the existence of a dairy product in Mongolia that processed mare’s milk to transform it into a fermented product with an alcohol content of 3% and Herodotus also reported something very similar performed by the Scythians;

Abstract

The milk from non-bovine species is gaining considerable attention mainly due to the fact that it is consumed by sensitive consumers (infants and elderly). Donkey milk possesses various health benefits, namely, anti-microbial activity, immunomodulation, hypoallergenicity, prevention of cardiovascular diseases which are elaborated in details here. Similarity in nutrition profile among donkey and human milk is discussed in detail. The donkey milk’s yield, its milking technique, effect of lactation on chemical composition and the microbial aspect is also described. As, availability of donkey milk is limited, therefore its processing becomes essential for its usage over a long period of time. Preparation of various donkey milk products like yoghurt, ice cream and cheese are also described here.

Abstract

Sheep milk is one of the superior quality of dairy foods and it is also considered as nutritional powerhouse. The beneficial role of sheep milk results from its fatty acid, immunoglobulin and non-immune protein contents. Apart from different dairy products and functional foods; this milk is used in anti-ageing and cosmetic soap preparations. In India Sheep make a valuable contribution to the livelihood of the economically weaker sections of the society. In our country the major portion of sheep milk is consumed as fluid milk and in certain areas converted into ghee and dahi.

Abstract

From the vedic time itself goat is popularly known as a poor man’s cow in India. It has the proven potential to make significant contribution to the poor man’s economy thus livelihood with minimal requirement of care. It can be easily managed by women and children in spare time as it is small-sized animal. Other maintenance requirement like feeding, milking and care of goats do not require much equipment and hard work. Capital investment and feeding costs are also quite low. It not only supplies nutritious and easily digestible milk but goat meat has high demand and price in the market thus can act as regular source of additional income for poor and landless or marginal farmers. Also the role of women in goat keeping is very significant in the poor rural families and goat is the most important means through which rural women are able to contribute meaningfully to the cash needs for their family members. Thus, goat rearing can play very important role in balanced socio-economic development of the country as there is a close relationship between the status of women and the socioeconomic development of any country (Alam, 2001 and Ahmed, 2017).

Abstract

Goat farming was the important part from the economy point of the view; especially in the Mediterranean and Middle East region where goat is also called as “Cow of poor man”. Goat milk have unique compositional characteristics like, lower ethanol stability, higher content of short- and medium-chain fatty acids. It is a rich source of calcium, phosphorous, chlorine, and vitamins. It is highly digestible and has a mild laxative effect. Along with these, who are suffering from anemia, osteoporosis and malabsorption, they should consume Goat milk. Goat milk is a functional and nutraceutical property as it both nutritional and additional health benefit such as easily digestible, boost immunity and metabolism, anti-inflammatory and anti-carcinogenic to consumer this lead to increasing demand for goat milk and derived dairy products. Goat milk can be used to manufacture a wide variety of products, including fluid, fermented, frozen, acid coagulated, and dehydrated milk products.

The aim of this chapter is to highlight the physical and chemical properties, nutritional and health benefit of Goat milk. Goat milk based some popular products are also discussed in order to provide some basic information regarding the value addition of Goat milk.

Abstract

Camel milk has been known in Asia and Africa for 5000years for its benefits for human health. It is the closest to human mother’s milk and safe for children. Research studies around the world have confirmed that camel milk has better nutritional value as it exhibits many unique and amazing health-promoting properties as compared to cow milk. This milk is considered as a complete food and can be consumed exclusively while meeting all nutritional requirements. Many studies have reported that camel milk contains very high concentrations of mono- and polyunsaturated fatty acids, low fats, cholesterol, and lactose. It also contains higher amounts of minerals (calcium, iron, magnesium, copper, zinc, and potassium), vitamins B2 and C as compared to cow milk. It does not contains beta lactoglobulin and beta casein that are present in cow milk and that are the main cause of allergy in certain human population. Furthermore, camel milk contains various protective proteins that exert antibacterial, antiviral, and immunological properties. It possesses unique, powerful immune system–boosting components that would exert potential health benefits. It is an alternative for people suffering from cow milk allergy. So camel milk can be considered as next generation super food.

Abstract

Buffalo is the second major source of milk supply in the world. India, Pakistan, China, Egypt, Nepal, Myanmar, Italy, Sri Lanka, Iran, and Turkey are the top ten countries of highest buffalo milk production. In Asian countries, Riverine buffalo is mostly used milk purpose breed. Buffalo milk is a plentiful source of nutrients including fat, protein, essential fatty acids, essential amino acids, lactose and beneficial oligosaccharides, indispensable fat and water soluble vitamins, vital minerals. It contains more total solids, fat, protein, lactose and calcium as compared to cow milk. Buffalo milk possesses wide potential to be used in the production of a range of dairy products. On account of the differences in physico-chemical and biochemical properties between buffalo and cow milk, conventional processing technology and equipment for cow milk may not be suitable for buffalo milk processing. Changes and modifications must be considered for making certain products. This chapter aims to highlight the nutritional profile including amino acid profile, lipid profile and mineral composition; physico-chemical properties and potential of buffalo milk in the dairy sector.

Abstract

Rhizobia are soil bacteria that fix atmospheric dinitrogen after establishing symbiotic relationship inside the root nodules of legumes (Fabaceae). Plant Growth Promoting Rhizobacteria are the group of bacteria which thrive in the rhizosphere region and enhance the plant growth through direct & indirect mechanisms. Pulses are being inoculated with specific rhizobial strains to have better nodulation in India. The native rhizobial strains from the root nodules of legumes from different agroclimatic zones of Odisha was isolated, characterised and screened for PGP activities. Out of all eleven isolates showed similar characteristics with the family Rhizobiacae. Among them six isolates contained nif-gene and PGPR activity (B2, B4, B5, B6, B7 and B8) were applied to seeds, that helped in faster germination and better elongation of root and shoot. The observations were statistically significant.

Abstract

Phosphorus is the second important key element after nitrogen as a mineral nutrient in terms of quantitative plant requirement. Although abundant in soils, in both organic and inorganic forms, its availability is restricted as it occurs mostly in insoluble forms. The dynamics of phosphorus in soil is closely related to the dynamics of the biological cycle in which microorganisms play a central role. They also participate in the cycles of the most important macro and microelements such as phosphorus besides their major role in the decomposition of plant residues, creation of humus and maintenance of stable soil structure. Microorganisms affect the amount of phosphorus accessible to plants by means of mineralization of organic phosphorus compounds, immobilization of available phosphorus and solubilization of non-soluble phosphorus minerals such as tricalcium phosphate. Mineralization is catalyzed by microbiological enzymes phosphatases secreted by a diverse group of bacteria, fungi and other groups of microorganisms. Organic phosphorus mineralization in soil depends on several soil and environmental factors such as temperature, pH, soil moisture, degree of aeration. In this chapter the major emphasis is given on the transformation of P through microbiologically involving different enzymes and also the microorganisms involved in the process. Emphasis is also given on the factors that have profound influence on the microbial transformation of P in soil and ultimately making it available for plant uptake. This chapter also focuses on the mechanism of P solubilization, role of various phosphatases, impact of various factors on P solubilization and potential for application of this knowledge in managing a sustainable environmental system.

Abstract

Agriculture provides food, feed, fiber and many other desired products for survival of human beings in the world. Modern agriculture emphasizes on use of hybrid seeds, high yielding varieties and chemical fertilizer to increase the crop productivity within a short period. Indiscriminate use of synthetic fertilizers has led to environmental pollution and deterioration of soil health, which results in depletion of essential plant nutrients and organic matter in soil. On account of the environmental hazard and soil infertility, biofertilizer concept was developed. Biofertilizer are natural fertilizers including bacteria, fungi and algae alone or in combination that augment availability of nutrients to the plants. However, due to its short shelf life period it may not be a suitable candidate for modern agriculture. Thus, it is the need of the hour to develop an economic and eco-friendly nano-biofertilizer for sustainable agriculture.

Abstract

Potassium (K) is the third most essential macronutrient element for plants. More than 98% of K in agricultural soils are remained as insoluble organic and inorganic compounds or complexes that are unavailable for plant uptake. Nutrition of crop plants are heavily relied on application of expensive inorganic chemical fertilizers, which is a potential cause of environmental pollution. An eco-friendly alternative strategy for plant K nutrition could be the application of K solubilizing bacteria (KSB) as biofertilizer. Plant and soil-associated bacteria from diverse taxonomic genera such as Bacillus, Pseudomonas, Acidithiobacillus, Paenibacillus, Flectobacillus, Arthrobacter, Enterobacter, Sphingomonas, Paraburkholderia etc. have shown high K solubilizing activities and promote plant nutrition in K deficient soils. The mechanisms involved in their activities include acidolysis, chelation, exchange reactions, and enzymatic degradation of insoluble K minerals and other K complexes. However, inconsistency in the efficiency of KSB-based biofertilizer for crop production in diverse ecological settings is still a big challenge. Recent genomics, post-genomics and CRISPR-Cas genome editing approaches seem to be useful for a better understanding the underlying mechanisms of KSB and development of highly efficient K fertilizers for promoting sustainable agriculture. This chapter comprehensively reviews current updates of KSB-based biofertilizer and their potentials for promoting sustainable crop production. The role of genomics and post-genomics approaches for better understanding of the mechanisms of the functions of applied KSB-based biofertilizers in the crop field and mitigation of the existing inconsistency in the efficiency of KSB-based fertilizers are also discussed.

Abstract

Potassium is a very essential nutrient element that is required for proper health, growth, functioning and productivity of plants. However, up to 98% of this very important mineral is held up in insoluble, unavailable forms in the soil and with only approximately 2% soluble form available for plant use. Biofertilizers add nutrients to the soil for plant use by some mechanisms like the breakdown of phosphorus, potassium, fixing nitrogen, and also synthesizing some substances which in turn enhance plant growth. These processes take place naturally. Microorganisms that solubilize potassium have demonstrated an increased potassium uptake by plants when added as bio-inoculants consequently resulting in increased yield by these plants. This article reviewed the methods of isolation of potassium solubilizing bacteria and fungi and their use as biofertilizers. Data are presented showing summary of researches conducted on potassium solubilizing microorganisms and their findings. Figures on production efforts of biofertilizers in India per year and by states are also added.

Abstract

Nitrogen (N₂) is an essential nutrient for every organisms. It is the building block of many biological molecules. Atmosphere contains 79% of N₂ gas which cannot be used by plants directly as it is chemically inert. Many diazotrophs like bacteria and cyanobacteria have the capability to convert atmospheric dinitrogen into a usable form by means of Biological nitrogen fixation (BNF). N₂ fixation is generally three types i.e. Asymbiotic, Associative and Symbiotic. Asymbiotic N₂-fixation also known as free living N₂-fixation is under taken by some bacteria and cyanobacteria. In associative N₂-fixation, some bacteria fix nitrogen in association with root of some grasses and cereal plants. In symbiotic nitrogen fixation, Rhizobium form root nodule in legumes and fix atmospheric N₂ and convert it into the ammonia (NH₃) by the help of Nitrogenase enzyme. This oxygen sensitive enzyme consist of two components i.e. di-nitrogenase (MoFe protein) and di-nitrogenase reductase (Fe protein) which are highly conserve in sequence and structure. The N₂ fixing genes e.g. nod gene (nodulation gene) and the nif gene (nitrogen-fixing gene) are located in the plasmid which is also called mega plasmid. Symbiotic association between legume and rhizobium have agronomic importantance and reduce the use of N-fertilizers or even avoided. The long term use of the nitrogenous biofertilizer in the agricultural field is a promising approach to develop and fulfil N₂ demand of the growing crop without causing any environmental hazard.

Abstract

Sustainable agriculture is vital in today’s world as it offers the potential to meet our agricultural needs, something that conventional agriculture fails to do. Current soil management strategies are mainly dependent on inorganic chemical fertilizers, which caused a serious threat to human health and environment. To overcome the ecological problems resulting from the loss of plant nutrients and to increase crop yields in the absence of resources for obtaining costly fertilizers, microscopic organisms that allow more efficient nutrient use or increase nutrient availability can provide sustainable solutions for the present and future agricultural practices. Microbial populations are instrumental to fundamental processes that drive stability and productivity of agro-ecosystems. Several investigations addressed at improving understanding of the diversity, dynamics and importance of soil microbial communities and their beneficial and cooperative roles in agricultural productivity. Thus the technique, which uses microscopic organism as biofertilizer, is environment friendly and ensures safe and healthy agricultural products. In this chapter we aim to provide a brief overview of potential use of biofertilizer for attaining sustainability of agro-ecosystem.

Abstract

In recent years, significant studies have been carried out on Plant growth promoting rizhobacteria (PGPR) to replace the usage of pesticides and fertilizers to improve the plant health. Plant growth promoting rizhobacteria (PGPR) is a group of rhizosphere bacteria, which are symbionts to plants and influence their growth by providing plant growth promoting substances. Different bacterial genera act as plant growth promoting rizhobacteria (PGPR): Pseudomonas sp., Rhizobium sp., Azotobacter sp., Bacillus sp. Pseudomonads are gram negative rods, aerobic, fluorescent, motile and are able to produce siderophores which influence plant growth. There are multiple potential traits offered to the plants by plant growth promoting (PGP) Pseudomonas sp. are (1) Biocontrol agent against plant pathogens (2) Induced systemic resistance, which is a defense mechanisms in plants preceding to pathogenic attack (3) Influence of plant growth promoting (PGP) Pseudomonas sp.on agricultural crops (4) Siderophores, which are low molecular, high affinity iron chelating compounds which benefits the plants to acquire iron molecules (5) Nitrogen fixation (6) Phytoremediation of heavy metals (7) Solubilization of inorganic phosphates (8) Secretion of plant hormones (9) Bacteriocins(10) Antifungal factors (11) Antibiosis traits and (12) Endophytic PGP Pseudomonas sp.

Abstract

Soil salinity is one of the major environmental stresses affecting crop productivity and soil health drastically, particularly in arid and semi-arid areas. Most of the vegetable crops being salt sensitive, grow poorly in saline and alkaline soils. Soil salinity affects crops mainly due to the osmotic stress and excessive accumulation of toxic ions (Na⁺, Cl^-, and SO₄ ^2-), whereas alkali soils are generally characterized by poor physical conditions due to high concentrations of bicarbonate (HCO₃ ^-) and carbonate (CO₃ ^2-) as well as high exchangeable Na⁺. Excessive concentrations of sodium chloride (NaCl) in soil or irrigation water can induce several morphological, physiological, and biochemical responses in plants leading to stunted growth and yield. This is due to osmotic (i.e., water deficit) and ionic (i.e., Na⁺ and Cl^-) effects on nutrient uptake/translocation and metabolic processes such as nitrogen assimilation, photosynthesis, and protein synthesis. Plant growth promoting microbes (PGPMs) are considered as promising tools to overcome the limitations of salinity on crop growth and productivity. Many PGPMs can enhance tolerance of crops to salt stress by increasing nutrient uptake through better solubilization of nutrients like phosphorus and zinc, and also by production of small peptides, volatiles and metabolites with hormone activities such as indole-3-acetic acid or auxin analogs in the rhizosphere. This chapter discusses the benefits of PGPMs in plant adaptations to salt stress conditions.

Abstract

Agriculture is one of the most important factors contributing to the economic growth of India. Out of the 329 million hectares of India’s geographical area, about 114 million hectares are under cultivation. There are 17 essential elements required for proper plant growth. Of the mineral elements, the primary macronutrients (nitrogen, phosphorous, and potassium) are needed in the greatest quantities and are most likely to be in short supply in agricultural soils. Secondary macronutrients are needed in smaller quantities, and are typically found in sufficient quantities in agricultural soil, and therefore do not often limit crop growth. Micronutrients, or trace nutrients, are needed in very small amounts and can be toxic to plants in excess. Silicon (Si) and sodium (Na) are sometimes considered essential plant nutrients, due to their ubiquitous presence in soils.

The economy of India thrives on agriculture, the most practiced occupation in the country. Agricultural fertilizers are essential to enhance proper growth of plants and crop yield. Recently, farmers have been using chemical fertilizers for quicker and better yield. But these fertilizers endanger ecosystems, soil, plants, human and animal lives. In contrast, naturally grown biofertilizers not only give a better yield, but are also harmless to humans. This chapter aims to study the biofertilizers play a key role for enhancing economic development of sustainable agriculture (EDSA) in comparison to chemical fertilizers. Biofertilizers improve the crop yields, plant resistance, soil health, profit to farmers, and the benefit to cost ratio of biofertilizers were higher than chemical fertilizer, proved that the biofertilizers would lead to better sustainable economic development for the farmers and their country.

Abstract

The concern of global food security is growing day by day as the agriculturally available land is reducing each day with the expansion of industrialization and urbanization. During the course of urban and industrial development, crop production is greatly affected by global warming, contamination of hazardous materials, salinity and drought. To combat against such adversities, scientists have taken several additives measurement like development of transgenic crops, application of indigenous plant growth promoting microbes etc. for sustainable agriculture. Use of plant growth promoting microbes is getting popular day-by-day as they occupy a privilege niche with the autochthonous flora of specific environment. For the expanse of food and shelter, the microbes supply a wide range of plant regulators (e.g. auxins, cytokinins, gibberellins, ABA, phenols, NH₃ etc.), antibiotics, alkaloids, steroids, terpenoids, diterpenes, enzymes (e.g. cellulases, lipases, proteinase, esterases etc.) etc. for overall development of the plant. Apart from growth promotion, it also protects the plants against pathogenic invasion creating a competition with pathogens for nutrition and habitat. In near future, formulation of different plant growth promoting bacteria (like alpha- Azorhizobium, Azospirillum, Ancylobacter, Rhizobium, Bradyrhizobium, Sinorhizobium, Novosphingobium sp., beta- Burkholderia sp., gamma- Acinetobacter, Aeromonas, Azotobacter, Enterobacter, Klebsiella, Pantoea, Pseudomonas, Stenotrophomonas sp. Proteobacteria, Bacillus sp., Paenibacillus sp. and Actinobacteria- Microbacterium sp. etc.) and fungus (Aspergillus, Trichoderma, Penicillium etc.) may reduce the use of pesticides and chemical fertilizer to promote greener ways of crop production.

Abstract

Microbes are ubiquitously found in the environment. Their interaction with other living organisms could either be pathogenic or beneficial in nature. Soil as a rich source of microbes, researchers have extensively studied the plant-microbe interactions. The soil microbes supply the nutrients deficit plants with essential growth elements such as nitrogen, phosphorous, potassium, etc. and improve the texture and quality of the soil. Due to the destructive nature of chemical fertilizers to soil and environment, it was required to generate a more ecofriendly means of increasing the soil fertility. This led to the development of microbes based biofertilizers. The primary benefit of biofertilizers is to promote a healthy soil environment along with supplying essential nutrients to the plant. Again, biofertilizers can be tailor-made according to the specific plant or the climatic conditions. Fungal and bacteria based biofertilizers, either alone or in combinations are formulated for the plants. Lately, liquid fertilizers are increasingly finding their use in the biofertilizer industry due to their ease in manufacture and prolonged effect on plant growth. The scope of this chapter lays on the currently popular biofertilizers and recent trends in the biofertilizer industry.

10.1 Introduction

The agriculture sector is also transforming through technological intervention and advancements drastically to improve several processes and crop and livestock production systems. These advancements have resulted in minimizing operation and production costs, reduction of environmental impact and optimization overall production cycle. The major issue in the agriculture sector is human-intensive operation and non-availability of sufficient labor on time. The on-field task like fruit harvesting, intra-row weed control which is supposed to be more difficult to perform by the traditional machinery and manually. This has made to think to introduce the autonomous tractors and robotics platform in field operation. Timely activities and treatment play an important role in agriculture and agriculture production. The farmers generally face many problems in performing the task on the field due to various limitations. The cost is one of the main parameters which need to keep the farmer in a competitive market and reduce the cost of operation as low as possible. Also, the growing population demand more and more food which put pressure on the agriculture sector to raise crop production. In this situation, agriculture robots can play an important role to address the challenges in the farms. A robot can professionally perform the task and can automate the tasks which are difficult for manual labor. These are used in the agricultural lands and they are also completely autonomous. These robots are used in several applications in agriculture and can also work autonomously.

The robotic system has been widely used in industrial production and warehouses in an almost controlled environment. In the early 1960s, the agriculture and forestry sector initiated research into driverless vehicles with a focus on automatic steered system and autonomous tractors. Robotics has made an impact on agriculture and forestry since past few years. The purpose of minimizing the damage to the growing zone of soil tends to cater to the application of automatic vehicle guidance. The interest in the development of robotics system in agriculture has led many experts to explore the possibilities to develop more rational and adaptable vehicles based on a behavioural approach.

9.1 Introduction

The increase in world’s population and respective food demand has brought the global concern. The climate change alone has put a tremendous burden on the farming communities, and has become the major challenge to feed the burgeoning population. It has been estimated that by the end of the year 2050, the global population will be around 10 billion, meanwhile, the food demand will also be increased by 70-100 %. The traditional method of agricultural practices are not sufficient enough to meet the rising food demand. Therefore, to meet the increasing food demand, agriculture is intensified by the use of chemical fertilizer, pesticides, herbicides, which deteriorat the soil health. Thus, new automated/ mechanised systems have been introduced into the agriculture sector to ensure precision farming. These systems are quick in action, and satisfing the requirements along with generation of billions of employment worldwide. In a developing country like India, 65-70 per cent of the total population resides in rural areas, of which, most of the households are dependent on agriculture. The agriculture sector in India accounts for 18 per cent of the country’s GDP, and provide employment to 50 per cent of the total work force. The agriculture sector is one of the most sensitive sectors of Indian economy which supports all other sectors, and spreading its benefit to the far-reaching areas. Therefore, it becomes important for the developing country like India to develop agriculture sector to boost-up the rural economy.

With the advent of technology, a rapid transformation has been occurred in various industries, while agriculture remains the least digitized. Though, the application of aircraft/ drones in agriculture for fertilizer/ pesticides applications, image capturing, access to real-time quality data has adopted in some developed countries like Australia, USA, Japan, and some of the European countries. Moreover, these unmanned aerial vehicles could provide data of soil health, monitor crop health, assist in irrigation scheduling, yield estimation, and weather data analysis too. However, such development in agriculture is still lacking in developing countries. The agriculture development in the modern era could be done by taking the biological information and agricultural knowledge through integration of modern agriculture information technology with traditional agricultural practices. These knowledge integrations with mobile internet, cloud computing, and machine learning could enable to control the agricultural production system over stressed climate condition easily. Thus, Artificial Intelligence (AI), which is a sort of machine intelligence, an inbuilt set of programme and algorithms similar to the human brain in the current world is gaining more attention in agricultural application for precision farming.

8.1 Introduction

In the modern world, the most elementary desire of every common man is to have sufficient food and mental peace. With the increasing world population, pressure on both peace and availability of food are continuously increasing. Advancing agricultural research can explore a possibility to feed to all living beings. Agricultural crops are highly susceptible to climatic conditions and crop productivity which are mainly influenced by extreme weather conditions; including temperature and water availability. In open field conditions, during long dry weather condition, soil moisture reduces and increases the transpiration.

Plants are very important to all forms of life on the earth because they consume carbon dioxide from the atmosphere and produce oxygen. In addition, plants make up the base of the food web. Basically, plants need five things in order to grow and these are: sunlight, proper temperature, moisture, air and nutrients. These five things should be provided by the natural or artificial environments where the plants live. If any of these elements are missing, they can limit plant growth. If any environmental factor is less than ideal, it limits the plant›s growth. People began putting plants indoor to avoid the damage from cold weather and this practice led to development of greenhouse. With the improvement in living standard and upgradation in agricultural technologies, off seasoned cultivation is also possible by providing desired artificial environmental conditions. The environmental stress weakens a plant and makes it more susceptible to disease or insect attack. In the modern engineering era, plant production systems have become more sophisticated. The desired climatic condition to grow plants and its control have changed from manual to automated digital operations and control computers have become faster and more capable.

Environmental control techniques are essential for protected cultivation and are not only for greenhouse’s cultivation but are also applicable to tissue culture and space farming as well. Environmental control in the present protected crop cultivation practices has been profusely supported by computer and sensor developments which is sometimes aslo called controlled environment agriculture.

7.1 Introduction

Agriculture is the backbone of Indian economy and almost 70 per cent of the total population depends on it. After independence, India achieved self-sufficiency in primary agriculture like food grains, fruits, vegetables and milk, etc. Now it is time to think and focus on secondary agriculture. It is assumed that with the adaption of secondary agriculture, India can achieve the goal of doubling the income of farmers. The secondary agriculture can be defined as, value addition to agricultural products, generating basic facilities for primary processing and add value to the basic agro commodities to allow farmers to get better revenues from their farm produce. It also has job creation opportunity in the rural sector to grow rural economy, which is purely based on agriculture. Further, it can also be elaborated that secondary agriculture as a production activity and invented strategy which includes sustainability of production, monetisation of farmer’s produce, straightening of extension service and recognising agriculture as an enterprise. Secondary agriculture can help drive growth of primary agriculture in the three areas i.e. (i) value addition to primary agriculture production, (ii) farmer – industrial linked and (iii) effective utilization of crop residues of primary agriculture.

The value addition to a primary agriculture production can be achieved by establishing direct linkage of farmers with market through grading of agricultural produce, cluster farming, marketing skill and financial literacy. The farmer – industrial linkage is closely associated with rural off-farm activities such as bee keeping, livestock production, etc. it can be promoted as a part of an integrated farming system. The crop residues effectively can be utilized for energy generation. There is scope of establishing rural based agricultural entrepreneurship in the field of biofuel. Agribusiness incubation can help farming community and provide reliable market linkages to improve farmer’s realisations.

6.1 Introduction

Aquaponics represents the relationship between water, aquatic life, bacteria, nutrient dynamics and plants, which grow together in waterways all over the world. Taking cues from nature, aquaponics harnesses the power of bio-integrating these individual components: exchanging the waste by-product from the fish as a food for the bacteria, to be converted into a perfect fertilizer for the plants, to return the water in a clean and safe form to the fish. Just like mother nature does in every aquatic ecosystem.

Aquaponics is basically a combination of aquaculture and hydroponics plant production in a close-loop water system where both vegetables and fish grow simultaneously. This is a closed-loop system and considered as highly efficient, produce more food compared to the traditional farming system. Importantly, it has virtually no waste and with double purpose, aquaponics farming might be an economical viable solution to the low provision of fish and vegetable in some countries. In many cases, aquaponics is advertised as a form of sustainable agriculture because it is water efficient, and has fewer environmental impacts than some forms of aquaculture. That is why, aquaponics is considered as super sustainable and highly efficient because of the healthy symbiotic relationships among the plants, fish and nitrogen-fixing bacteria as illustrated in Fig 6.1. As fish excrete into the water, the water is then pumped up to the plant beds, and bacteria break down the fish excrement so the plants can absorb it.

Aquaponics farming is quite different than hydroponics farming. As discussed in previous chapter, hydroponics is the process of growing plants in a soilless medium where nutrients are added to the water for the plants to absorb. Such systems are not as sustainable and viable as aquaponics because they require the addition of other supplemental nutrients to get desired plants growth. The quality of water decline with time and require proper disposal otherwise, it will contaminate water streams and other water sources. On the other hand, aquaponics incorporates fish to provide the natural fertilizers and nutrients plants need. This simple addition, eliminates the need to add “food” for plants. Best of all, aquaponics has a built in self-cleaning and filtration system that returns clean water to the fish. Aquaponics farming system can be more productive and economically feasible where land and water are limited. No doubt, aquaponics is complicated and requires considerable start-up costs. The production of fish and vegetables is the most visible output of aquaponics farming units. It is essential to understand that aquaponics is the management of a complete ecosystem that includes three major groups of organisms: fish, plants and bacteria.

5.1 Introduction

Hydroponics is a method of growing plants in a nutrient solution rather than in soil. Terrestrial plants may be grown with only their roots exposed to the nutritious liquid.

Traditionally, the soil supports the crop’s roots by helping them remain upright and ensuring the delivery of water and essential nutrients. In hydroponics farming, crops are supported by an inert medium such as perlite, gravel, or other substrates. Therefore, the nutrients are supplied by using various practices that bring mineral nutrient solutions to the crops. In the present situation there excessive use of chemical fertilizers, affecting fertility of soil is badly affected. The fertility of the soil is falling that affects the plants growth but in hydroponics, the plant remains unaffected. Plants grow faster than in soil. Produce better quality of plants and higher yields. It use less water. It is possible to use hydroponics on outdoor crops, but most of the hydroponics production is in greenhouse. Hydroponic farming system has the potential to reduce the problem associated with traditional crop production. Therefore, it could serve to be a turning point in feeding the global population. The greenhouse and its environment control system are the same whether plants are grown conventionally or with hydroponics. The difference comes from the support system and the method of supplying water and nutrients.

The hydroponic farming has been successfully demonstrated by the commercial growers for fast-growing crops such as tomatoes, cucumbers, spinaches, lettuce, radishes, strawberries, bens, spring onions, coriander, and ornamentals. Indeed, hydroponics technology enables a more precise control of micro climatic conditions. In this technique, the vigorous development of a root system is taking place, which enable the uptake of essential nutrients from nutrient solution for better crop yield. The initial investment in hydroponics farming is high and required constant energy input. Owing to this, hydroponics farming is recommended for growing high value crops in developed countries such as the United States, Canada, Europe and Japan.

4.1 Introduction

In the modern era, agricultural productivity seems to have reached a maximum production due to the easy availability of fertilizers and pesticides/insecticide, which are used to improve crop productivity. Excess uses of these products and unawareness about field constraints can decrease the crop productivity and endanger the environmental balance in the cultivation area. Therefore, there is an urgent need to improve agricultural system and efficient utilization of these resources for profitable and environmentally sustainable agriculture.

Government has also an emphasis on effective and efficient use of available resources and farmers are also adopting more scientific approach during crop production such as remote sensing, global positioning system, and new equipment to make their agricultural operation more precise.

Precision agriculture is one of the many advanced farming approaches that make production more efficient. It is basically an approach of farm management with the help of information technology to confirm that the cultivated crops and soil receive desire input for optimum health and productivity. In other words, precision agriculture utilizes different tools and technologies to identify infield soil and crop variability for improving farming practices and optimizing agronomic inputs. To reduce dependency on excessive use of chemical inputs in agriculture, several technologies have been applied to make agricultural products safer and to lower their adverse impacts on the environment and human beings, a goal that is consistent with sustainable agriculture. Precision agriculture has emerged as a valuable component of the framework to achieve this goal. Further, Pierce and Nowak define the precision farming that, the application of technologies and principles to manage spatial and temporal variability associated with all aspects of agricultural production for improving crop performance and environmental quality. Precision agriculture is the combination of many different elements working together in a synchronised way with the help of Geographic Information System (GIS) as shown in Fig 4.1. Precision agriculture is basically an information technology based agricultural management system. In this modern management system, Geography information system (GIS) based analysis is extensively used to get land and crop related data accurately and timely, which help farming community to take correct decision .

3.1 Introduction

The world population will grow by another 2 billion people by 2025 and feeding them will be a big challenge. Rapid industrial development and fast urbanization, the arable lands are continuously shrinking. Many scientists and researchers reported that the Earth had lost a third of its arable lands over the last 40 years¹. In the current scenario, the most challenging task for agricultural sciences is to ensure for continuous and enough supply of food to growing human civilization. Presently, all available arable land on the earth are using extensive pesticides and fertilizers in various ways that are not sustainable as well as harmful to the environment.

There is an urgent need to think about sustainable farming options as arable land for farming is continuously reducing to fulfil the food material demand of growing population. Vertical farming can produce more food from fewer land and water resources. Though it takes out many of the risks inherent in outdoor crop production. With the control of light exposure, indoor temperature, relative humidity and watering levels, growers can grow food very efficiently. Vertical farming has the potential to produce food with less energy, less water, less waste and in less space than traditional methods. It also negates the need for harmful chemical fertilizers and pesticides. Developing and installing vertical farm in those areas where people need good quality healthy food, tackle the shortage of nutritive food material at a local level. Vertical farming can be defined as it is the practice of growing crops in vertically stacked layers where controlled-environment agriculture practices usually incorporated with the aims to optimize plant growth. The soilless farming techniques such as hydroponics, aquaponics, and aeroponics also incorporated in vertical farming as shown in Fig. 3.1. Vertical farming is a very old idea, and indigenous peoples used vertically layered growing techniques like the rice terraces of East Asia. The term vertical farming was coined by American geologist Gilbert Ellis Bailey in 1915. In 1999, Dickson Despommier, a professor at New York’s Columbia University, popularized the modern idea of vertical farming, building upon the idea together with his students.

2.1 Introduction

The great impact of increase in population as well as rapid economic growth has given us cause for concern about the future situation of the earth in recent years. Desertification as well as deforestation is continuously changing the landscape. Irrigated areas are being damaged by salinization. The effect to increase arable lands cannot match with the speed of these deteriorating processes. Weather is also being changed gradually by urbanization. In the new millennium, the challenges in the agricultural sector are very different from those met in the previous decades. The enormous pressure to produce more food from less land with shrinking natural resources is a tough task for the farmers. This calls for special effort to manage the key input without eroding the ecological assets and sound knowledge base to sustain agricultural productivity and profitability.

The maximum crop response depends on the level of the balanced environmental parameters. The natural environment and input availability may not be optimum for a given crop. The environmental factors which affect plant growth includes air temperature, relative humidity, carbon dioxide concentration soil temperature and moisture content to the soil. The micro-climate can be artificially controlled by means of plastic covering structure like greenhouse. The plastic covered greenhouse is the only mechanism, which transmits the useful wavelengths of the light spectrum for photosynthetic activity. Further, it also reduces the air movement, which is of great importance for the plant growth and often used to control the spread of plant diseases.

As far as plant propagation is concerned sunlight provides the primary energy for photosynthesis, the food chain and all human nutrition. The expansion of crop and flower production in various types of greenhouse during the recent years has enabled the growth of agricultural products throughout the year. An agricultural greenhouse consists of frames of metallic or wooden structure covered with a transparent material preferably plastic which provide a suitable environment for the intensive production of various crops. A greenhouse is essentially an enclosed structure, which traps the short wavelength solar radiation and convert and finally stores the long wavelength thermal radiation to create a favorable microclimate for higher productivity. Open field agricultural farming has no control on the environmental parameters such as sunlight, air composition and temperature that influence the plant escalation. Hence, a large number of winter vegetables, flowers and other horticultural crops have to be transported from distant places. Future greenhouse systems in moderate climates will have to be energy efficient. Greenhouses will have decreased transmission for long-wave length radiation and increased transmission for short-wave-radiation compared with common shelters.

1.1 General

Food is basic necessity for the survival of human beings. It is derived from agriculture which traps and transfers solar energy in chemical energy in the form of biomass and end products are processed and utilized for food, feed, fibre, fertilizer, and fuel. Indian’s economic security continues to be foreseen upon agricultural sector. Agriculture supports 52 per cent of population, as against about 75 per cent at the time of dependence. Despite the focus on industrialization, agriculture remains a dominant sector of the Indian economy both in terms of contribution to Gross Domestic Product (GDP) as well as a source of employment to millions across the country. India occupies a leading position in global trade of agricultural products. However, its total agricultural export basket accounts for a little over 2.15 per cent of the world agricultural trade. The major export destinations are USA, Saudi Arabia, Iran, Nepal and Bangladesh. Among agricultural commodities, basmati rice, spices, oil meals, sugar, cotton and castor oil have been leading export commodities.

Agriculture is an essential ingredient in overall development of India economic. The history of Indian agriculture in dates back to Indus Valley Civilization and even before that in some places of Southern India. India ranks second worldwide in farm outputs.

On the eve of Independence, 70 per cent of India’s nation income was from agricultural sector. Before 1947, over 85 per cent of country’s population lives in villages where livelihood completely depended on agriculture, which contributed over 95per cent of country’s income. Agricultural sector was most important sector in Indian economy facing massive stagnation and continuous determination. In the present context, around 60 – 70 per cent of Indian population directly or indirectly depends upon the agricultural sector and currently it contributes to 16 per cent of the Indian gross domestic product.

Hazard Analysis Critical Control Points (HACCP) is an internationally recognized method of identifying and managing food safety related risk and, when central to an active food safety program, can provide customers, the public and regulatory agencies assurance that a food safety program is well managed. HACCP is a management system in which food safety is addressed through the analysis and control of biological, chemical, and physical hazards from raw material production, procurement and handling, to manufacturing, distribution and consumption of the finished product. (FAO, 2003)

Mycotoxin hazard analysis and identification of possible control measures

I. Hazard Analysis

a) Identification of mycotoxin hazard

For a given commodity system in a particular location, the HACCP team need to first consider which, if any, of the mycotoxins known to constitute a food safety hazard are likely to be present. Over 300 mycotoxins are known, but only a relatively few of these are widely accepted as presenting a significant food or animal feed safety risk.

The following mycotoxins have regulatory limits set by one or more countries: the aflatoxins (including aflatoxin M₁), ochratoxin A, zearalenone, patulin, ergot alkaloids, and deoxynivalenol. Guideline limits exist for fumonisin B₁ and regulatory limits are likely to be set in the near future. The regulatory limits are taken as the target levels and should be included in the Product Description table. Mycotoxin limits can also be set by the customer in specific contracts and it is possible that these may include mycotoxins not subject to regulatory limits.

The economic loss in livestock arising due to mycotoxicosis is enormous apart from being a health risk. Indian economy is heavily affected by mycotoxins. It was estimated that 10 million dollars were lost in India’s export within a decade due to groundnut contamination with mycotoxins (Vasanthi and Bhat, 1998). Many developing countries have realized that reducing mycotoxin contamination in foods will not only improve the health and production in animal, but also increase the raw material exports (international trade) to other countries. The following strategies are to be adhered strictly to reduce the mycotoxins contamination of crops in the field.

1. Early harvesting

Early harvesting reduces the fungal infection of crop in the field. Early harvesting and threshing of groundnuts results in lower aflatoxin levels and higher gross returns of 27% than in delayed harvesting (Rachaputi et al., 2002).

Mycotoxins are toxic secondary metabolites produced by different types of moulds which are present in soil, plant and feed ingredients. Ingestion of toxins will result in reduced growth and production performance due to reduced nutrient utilization, illness or death of animals. Analysing the presence of mycotoxin and its concentration in grain and feeds is necessary to eliminate the adverse health effects of mycotoxins in animals. Estimation of mycotoxin in feed ingredients is a challenging task because the concentration of toxin is at µg/kg or parts-per billion levels. At the same time, analysing inappropriate samples is a waste of resources. Mycotoxins are not evenly distributed in feeds or grains. If the specimen collected for analysis includes contaminated grain, the mycotoxin will be detected. If not, the mycotoxin will not be detected.

Sample collection for mycotoxin analysis

The objective of sample collection is to collect the specimen samples from as many parts of the feed lot as possible. The size of the collected specimen depends on the size of the load received. Sample collecting probes can be used to collect the samples from bags.

Different type of mycotoxins commonly present in different feed and fodder crops are produced by mould during cultivation and storage and are specific to certain region according to climatic and environmental conditions. Most of the toxins produced in crops are consumed when fed to animals. Among the mycotoxins, aflatoxin B-1 is present in highest concentration which enters rumen following ingestion of aflatoxin contaminated feed stuffs. In the rumen, AFB-1 is degraded into aflatoxicol and the remaining portion of the aflatoxin is absorbed in the digestive tract by passive diffusion and metabolized in the liver into aflatoxin M-1 (Kuilman et al., 1998). AFM-1 circulates in the blood as a stable compound until excreted in milk, urine and bile. The following are the sources of AFM-1 contamination in milk and milk products and it occurs through two modes of contamination viz., indirect contamination and direct contamination.

Mould growth in raw materials or finished feeds result in production of mycotoxins. Mycotoxins are a large group of toxic chemicals causing wide range of pathological and physiological effects in animals. Symptoms depend on the amount of toxin present in the feed, the period for which the feed is ingested, the nutritional status of the feed and the susceptibility of the animal. Feed efficiency, growth rate and production are affected in animals consuming sub-acute doses.

Ruminants are generally considered less susceptible to mycotoxins than monogastric animals because of degradation of mycotoxin in rumen by rumen microorganism. However, certain mycotoxins resist rumen degradation and cause clinical mycotoxicosis. In high yielding dairy animals, during transition period, animals who are in negative energy balance (NEB), low body condition score and decreased resistance to infectious agents cause adverse effects in animal health with exposure of mycotoxins present in animal diet.

Effect of mycotoxin in ruminants

In cattle during metabolism, mycotoxin present in stored or ensiled feeds produce microbial volatile organic compounds (MVOCs) which are responsible for mouldy odour, reduced feed intake and increased feeding times. This insufficient feed intake further produces negative energy balance (NEB).

The ingestion of mycotoxin-contaminated feedstuffs by animals leads to adverse effect on animal health and the effects are more serious in monogastric animals depending on the species and the susceptibility to toxins within the species. Ruminants are less susceptible to mycotoxins than monogastric animals because of biotransformation of mycotoxins to non-toxic metabolites in rumen by rumen microbiota (Fink-Gremmels, 2008).

Various physical, chemical and biological factors interdependently affect the fungal colonization or production of the mycotoxin. Physical factors such as temperature, relative humidity and insect infestations create ideal environment for fungal colonization and mycotoxin production. Stresses such as drought, an increase in temperature, and an increase in relative humidity may selectively alter colonization and metabolism of mycotoxigenic fungi and thus alter mycotoxin production (Russell et al., 1991). Cool and damp weather favours the germination of the sclerotia and thus ergot alkaloid formation in fescue and ryegrass.

Biological factors are categorized into intrinsic factor such as fungal species, strain specificity, strain variation and instability of toxigenic properties. Interaction between the toxigenic fungal species and substrate affect the fungal colonization and mycotoxin production. Some plant species are more susceptible to colonization and some resistant plant species may also get infestation due to favourable environmental conditions.

Mycotoxins are the secondary metabolites produced by moulds, which grow on food and feedstuffs causing pathological or physiological changes to humans and animals. They are toxic to vertebrates in low concentrations. Symptoms depend on the amount of toxin in the feed, the period for which the infested feed is ingested, the nutritional status of the feed and the susceptibility of the animal species. Toxic effects of chronic consumption of mycotoxins in human are carcinogenicity, hepatotoxicity, oestrogenicity, genotoxicity, nephrotoxicity, immunosuppression, reproductive disorders and dermal irritation (Anfossi et al., 2010). The most extensively studied mycotoxins viz., Aflatoxins, ochratoxins, deoxynivalenol (DON, vomitoxin), T-2 toxin, zearalenone, fumoninsins, mycophenolic acid, cyclopiazonic acid and ergot toxins are produced by the moulds Aspergillus, Fusarium, Pennicillium and Claviceps (Iqbal et al., 2015).

The Fertilizer (Control) Order

The Fertilizer (Control) Order (FCO) is a set of legally enforceable executive orders issued by the Govt. of India under the Essential Commodities Act, 1955 passed by the Parliament. This order came into force in 1957, essentially to regulate the sale, price and quality of fertilizers in India. Amendments are made from time to time as per the exigencies and need of the hour and therefore a large number of amendments were made over a period of time. Consequently, after an overall review of the various provisions of the order, a revised Fertilizer (Control) Order 1985, was issued, which came into effect on September 25, 1985. The FCO consists of five Schedules comprising of different activities as mentioned in Figure 8.1, besides forms of registrations and appendices.

Schedule I comprises Part A and B. While Part A contains the specifications of different fertilizers (e.g. minimum nutrient content, maximum moisture content, range of physical parameters, maximum levels of impurities/ contaminants, etc.), that can be marketed in India (no material not performs the specifications as in the FCO cannot be sold as fertilizer), Part B lists the tolerance limits in plant nutrients and physical parameters for various fertilizers. Schedule II encompasses again two parts, with Part A describing the procedures for drawal of samples of fertilizers, and Part B describing detailed methods of analysis of fertilizers.

Schedule III encompasses four parts namely, Part-A, Part-B, Part-C and Part-D. While Part-A contains specifications of different biofertilizers, Part-B contains tolerance limits of biofertilizers, Part-C describes the procedures for drawal of sample of biofertilizers, Part-D describes the methods of analysis of biofertilizers. Schedule IV also encompasses four parts. Part-A contains specifications of organic fertilizers, Part-B contains tolerance limits of organic fertilizers, Part-C describes the procedures for drawal of sample of organic fertilizers, and Part-D describes the methods of analysis of organic fertilizers. Schedule V also contains of four parts. Part-A contains specifications of non-edible de-oiled cake fertilizers, Part-B contains tolerance limits of non-edible de-oiled cake fertilizers, Part-C describes the procedures for drawal of sample of non-edible de-oiled cake fertilizers, and Part-D describes the methods of analysis of non-edible de-oiled cake fertilizers.

Fertilizers have played a pivotal role in enhancing food grain production in India especially after the introduction of high yielding and fertilizer responsive crop varieties during the green revolution era. However, there are certain problems associated with fertilizers because of their relatively low nutrient use efficiency (NUE) or nutrient uptake by crops. The fertilizer use efficiency is 30-50% for N, 15-20% for P, 70-80% for K and 8-10% for S. In case of micronutrients, the use efficiency is only 1-2%. The low NUE is typically the result of higher release rate of fertilizers than the absorption rate by plants, and/or transformation of fertilizers/ nutrients to forms that are not bioavailable to crops.

Application of N and P fertilizers at levels exceeding plant requirements due to low acquisition efficiency leads to significant environmental consequences in many parts of the world due to losses, such as nitrate (NO₃^-) leaching, NH₃ volatilization, and nitrous oxide (N₂O) emission. Excessive use of fertilizer N affects the groundwater. Similarly, excessive use of N and P fertilizers leads to surface runoff which in turn causes eutrophication in aquatic ecosystems. These negative environmental consequences associated with fertilizer inputs further emphasize the need of technological approaches to improve nutrient management in modern agriculture. As such, there is great need in developing innovative fertilizers to minimize the losses of nutrients and increase their efficiencies.

In addition, current agricultural activities contribute up to 20-30% to the annual atmospheric emissions of greenhouse gases (GHGs), such as methane (CH₄) and carbon dioxide (CO₂). Even higher contribution is being noted for N₂O (about 60%), which is a potent GHG and catalyst for stratospheric ozone depletion, with more than 300 times the global warming potential than CO₂. Its emission is closely related to mineral fertilizer input. High fertilization rates lead to N and P losses with negative impacts on atmospheric GHGs concentrations and water quality.

There is an urgent need to improve NUE in agricultural systems, and to manage biogeochemical cycles in a sustainable way. This includes the development and application of modern technology as alternatives to conventional fertilization. There is a need to reduce the use of fertilizers/nutrients in agricultural systems by increasing NUE. The recent development in smart fertilizer delivery systems including nanofertilizers or the new generation fertilizers is a good alternative to commercially available fertilizers to improve the NUE and enhance resource utilization. Smart fertilizers may be a solution to enhance food production and environmental quality.

Iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), nickel (Ni), boron (B), molybdenum (Mo) and chloride (Cl) elements are known as micronutrients. The micronutrients are also called as trace elements or minor elements as they are required very small quantities by plants. The elements Fe, Zn, Cu, Mn and Ni are known as micronutrient cations and B, Mo and Cl are known as micronutrient anions and they behave accordingly in soils. Among these elements, Fe content in soil as well as plant is the highest and sometimes higher than phosphorus (P) and sulphur (S). In plant, the concentration of micronutrients often found up to 100 mg kg^-1, except that of Fe and Mn which may go up to 500 mg kg^-1 (dry weight basis). Another element, cobalt (Co) is also regarded to be essential for the growth of certain higher plants and animals, and likely to be included in the list of micronutrients. The importance of micronutrients has been realized during the past four decades when micronutrient deficiencies were observed in most of the soils in our country, where intensive agriculture is practiced.

5.1. Importance of Secondary Nutrients in Agriculture

Secondary nutrients such as sulphur (S), calcium (Ca) and magnesium (Mg) are the macronutrients that are required in relatively large amounts for crop growth. Among the secondary nutrients, Ca is the 5^th most abundant element in the earth’s crust while, Mg and S are ranked 8^th and 13^th, respectively. The average S content of the earth’s crust ranges from 0.06 to 0.10%; whereas, Ca in soil solution of temperate region soils is 30 to 300 ppm and soils of tropical areas is 8 to 45 ppm (Tisdale et al., 1997). In case of Mg, its’ concentration ranges from 5-50 in temperate region and 120-2400 ppm in tropical region. The Ca and Mg are the most abundant cations occupying the exchange sites of the soil colloids. Thus, most soils with the possible exception of highly weathered, leached acid soils, contain enough Ca and Mg for crop growth. In soils, occurrence and reactions of S are different from those of Ca and Mg. The plant available S is SO₄^2- ion which is relatively mobile in soil solution. Like nitrogen (N), S is also subjected to chemical and biological oxidation-reduction reactions. On the other hand, Ca and Mg are much more stable and they exist in soil as Ca²⁺ and Mg²⁺ cations and present in association with soil colloidal fraction similar to that of K. In general, Ca and Mg are the most abundant cations occupying in the exchange site.

Secondary nutrients in soils may be lost due to several reasons such as (i) crop removal, (ii) leaching, (iii) erosion, and (iv) volatilization. The amount of Ca and Mg attain importance in areas where soils are either strongly alkaline or acidic. These soils are often deficient in Ca and Mg. The Ca deficiency is most widespread in acidic soils. The alluvial soils of the Indo-Gangetic Plains (IGP), being neutral to moderately alkaline in reaction, have sufficient bases on their exchange complex and Ca deficiency is, therefore, rarely found in these soils. However, alkali soils may contain inadequate quantities of Ca due to dominance of Na⁺ on the exchange complex. Magnesium deficiency is found in sandy soils with low exchangeable Mg²⁺, acid soils and those with high in native or applied K. Alkali soils have high exchangeable Na⁺. The Ca²⁺ is a suitable ion to replace this Na⁺ from the exchange complex when Ca²⁺ is supplied through gypsum (CaSO₄.2H₂O). The replaced Na⁺ forms Na₂SO₄ which is then leached down to remove the salt away from the root zone of the crops. Gypsum also reacts with Na₂CO₃ to form CaCO₃ and Na₂SO₄ which is leached down the profile. A thorough leaching of the soil with irrigation water should be done after application of gypsum to free it from Na₂SO₄.

Potassium is the third important essential nutrient element after nitrogen (N) and phosphorus (P) required by all living organisms, including plants and animals. Potassium is essential for many metabolic activities like carbohydrate metabolism, nitrogen metabolism. It is required for the activation of over 60 enzymes in plants. It controls/regulates the activities of various essential nutrients. It is vital to photosynthesis, and synthesis of carbohydrates, starch and proteins in plants. It plays vital role in controlling the opening and closing of stomata in photosynthesis. It also helps in controlling water use by plants by regulating the osmotic pressure of guard cells during transpiration. It plays a major role in transport of water and nutrients throughout the plant in xylem. Potassium improves crop yield and quality of flowers, fruits, vegetables and other field crops in terms of size, shape, colour, taste, shelf-life, and fibre quality. Potassium stimulates the growth of strong stems and provides strength to the plant against some disease by promoting thickness of the outer cell walls. It is required for translocation of assimilates. Under reduced K supply, translocation of NO₃^-, PO₄^3-, Ca²⁺, Mg²⁺ and amino acids is hampered. It also imparts resistance against environmental stresses such as drought, cold and frost. Adequate K can reduce moisture loss from growing plants, thereby giving some drought resistance. It reduces lodging of crops and enhances their winter-hardiness.

It is taken up by the plants as K⁺. Being a basic element, it takes part in neutralization of the acidity in plants caused by several organic acids produced. It does not form organic compounds in the plant system. It is the most mobile element in the plant. Thus, it can move through all the plant system due to osmotic pressure. When any plant sample is dipped into water, some K comes out. This shows that it is highly mobile.

Potassium is also required for animal nutrition and human beings. Potassium is essential for many metabolic functions. It maintains salt balance between cells and body fluids. Adequate K is essential for nerve function and preventing muscle cramps. It is routinely added to many animal feeds. Since K⁺ is not stored in the human body, dietary replacement is required on a regular basis. Government agencies state that diets containing foods that are good sources of K and low in Na may reduce the risk of high blood pressure and stroke.

Phosphorus (P) is the second most important essential nutrient limiting crop/ plant growth, next only to nitrogen (N). Phosphorus is an important component of nucleic acid like deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). It is needed for energy storage and transfer, which is the single most important essential function of P. Phosphate compounds act as “energy currency” within plants. The most important common P energy currency is adenosine diphosphate (ADP) and adenosine triphosphate (ATP). The ATP transfers energy for synthesis of ADP. Life is not possible without P. It is the source of energy that powers practically all energy-requiring biological processes in plants. Phosphorus is present in plant as phospholipid such as lecithin and cephalin which appears to be involved in the structural framework of protoplasm. Phosphorus is involved in many important processes such as photosynthesis, cell division, tissue development, and growth in plant. Requirement of P by the crops is less, compared to N and potassium (K). It is present in plant tissues. It is reported that for 5-6 t ha^-1 of wheat grain yield, it removes about 100-120 kg N, 20-30 kg P₂O₅ and 150-180 kg K₂O from soil.

Phosphorus is 11^th most abundant element on the earth crust. However, it is the least mobile element among the major plant nutrients. Its complex chemistry in soil makes it highly deficient nutrient element in most of the arable soils across the globe. Only 0.1% of the total P in the soil is available for uptake by plants because of its fixation as various insoluble compounds depending upon the soil pH. About 43% of the world’s arable soil is P deficient which limits crop growth and production (Roy et al., 2018). In the Indian context, about 80% of the soils are reported to have low to medium available P content (Muralidharudu et al., 2011). Thus, application of P-fertilizers to maintain the soil fertility and sustain crop productivity becomes imperative in today’s input intensive agriculture.

Nitrogen (N) is an essential element for all forms of life because it is a major component of amino acids, which are the building blocks of proteins, nucleic acids such as deoxyribonucleic acid (DNA) and other cellular constituents. It is a structural component of chlorophyll in plants, which is used in photosynthesis to make their food. Nitrogen ranks first among the essential nutrient elements required for plants. Its careful management is very important for crop production.

Nitrogen exists as two main stable isotopes (isotopes of a given element have the same number of protons but different numbers of neutrons in each atom) namely, ¹⁴₇N (abundance 99.63%) and ¹⁵₇N (abundance 0.37%). These can be separated by chemical exchange or by thermal diffusion. Both ¹⁴₇N and ¹⁵₇N isotopes of N are stable isotope which do not disintegrate as in case of other radioactive isotope like ³² ₁₅P. There are four other isotopes of N viz. ¹²₇N, ¹³₇N, ¹⁶₇N and ¹⁷₇N, mostly are radioactive having very short half-life and not used in agriculture. The ¹³₇N has a half-life of about 10 min, while other three have half-life of only few sec. The ¹⁵₇N (tracer) isotope is used as a tool for determination of pathways of transformation of N in soil or plant or animal.

The major part of N comes from atmosphere (air). On the basis of volume by volume (v/v), air contains about 78-79% N₂, 20-21% oxygen (O₂) and 0.03% carbon dioxide (CO₂). Most living organisms cannot utilize N₂ gas present in the atmosphere directly because it is present as di-nitrogen form or di-atomic form (N≡N). It is called as an inert gas. Therefore, to break this triple bond, huge amount of energy is required. After breaking of triple bond of N₂ molecules, it combines with other element particularly with O₂ or hydrogen (H) to form oxides of N (NO, NO₂, NO₃ and N₂O) or ammonia (NH₃). Thus, breaking of triple bond is must for forming NH₃ which further can be used as the key material for almost all fertilizers. Therefore, the fixation of N₂ is vital for production of all nitrogenous and complex fertilizers like NP/NPK and nitrophosphates.

Plant absorbs large number of elements from the soil and other sources during their growth and development. But all these elements are not essential for plant growth. Seventeen mineral elements are known to be essential for the growth and development of all plants. A list of essential nutrients, their source and forms by which they are absorbed by plants are presented in Table 1.1.

Except carbon (C), hydrogen (H) and oxygen (O), all the other nutrients are obtained by plants largely from soils, fertilizers or manures. It has been seen that the number of nutrients obtained from soil is about 5 times the number of nutrients obtained from air and water. However, most of the plant tissue, in general, from 74 to 99.5% is made up of C, H and O i.e. nutrients obtained from air and water and only 0.5 to 26% of the plant tissue is synthesized from soil constituents. In ordinary (normal) conditions of agriculture, except drought, C, O and H are not limited for plant growth. It is the remaining 14 elements from soil that are usually limiting plant development and hence considerable emphasis is placed on the improvement of soil in respect of greater availability of these 14 nutrients. It may be borne in mind that all nutrients are essential for all crops even though their requirements differ from crop to crop and even among varieties of a given crop. Secondly, all nutrients are equally essential regardless of amounts required. For example, to produce one tonne of grain, wheat may absorb 25, 9, 33, 3.7, 5.3 and 4.7 kg of nitrogen (N), phosphorus (P), potassium (K), sulphur (S), calcium (Ca) and magnesium (Mg), respectively and 56, 624, 70, 24, 48 and 2 g of zinc (Zn), iron (Fe), manganese (Mn), copper (Cu), boron (B) and molybdenum (Mo), respectively. If the crop (any crop) does not get the smallest amounts of micronutrients needed, it cannot make the best use of abundant NPK.

According to Liebig’s Law of minimum which he enunciated in 1855, the growth of a plant is limited by that nutrient which is in shortest supply. This law in fact lays the ground rules for balanced crop nutrition.

Introduction

Over the years, processed food industry has become the largest growing industry in the world. The convenience food industry with the state of the art technology has been proved very successful in reaching every household and have started replacing fresh and healthy foods with the processed ones (Srinivasan and Shende, 2016).

Demand for processed and convenience foods are constantly on rise and convenience food segment is rising by leaps and bounds. Changing life style, food habits, displacement of rural population to urban centres, insufficient time to prepare healthy food and changing socio economic needs have led to the industrialization of the food supply and resulted in the development of convenience foods and today a great variety of the same are available for sale to the consumer throughout the world (Tillotson, 2003).

These convenience foods are available readily, convenient, inexpensive with pleasing organoleptic quality, requires minimal or no preparation before consumption. Varieties of convenience foods which are available in the market play a prominent role in the food choice of today’s consumer, and they include frozen and canned vegetables, bakery products, soups, sauces, prepared meat and fish, chilled and frozen dairy products as well as ready to eat and shelf stable products (Tillotson, 2003).

Rapid switchover of the consumer from the traditional dining practices to fast food centres, generally feed on quick and easily made products called fast foods, often termed as unhealthy junk foods. These foods are rich in saturated fatty acids, several refined components, high carbohydrates etc., which ultimately lead to the negative impact on physical and mental health of the consumer, contributing to several chronic diseases such as cardiovascular complications, cancer, atherosclerosis, liver disease, type 11 diabetes (Veggie et al., 2018) etc.

Therefore, focussing much about the health of the consumer, there is a great need for a healthy and a balanced diet to meet the basic needs of the human body (Mendes et al 2013) with an appealing organoleptic properties and appearance.

Introduction

Recent advances in food technology have made our lives virtually easier and efficient. Changing lifestyle has led to the emergence of packaged food that provides convenience to the consumers. The authentic packaging of food implements consumers with the role of communication, containment, convenience, and protection. Any typical food package provides us with the information about the product and its nutritional fact, thus an efficient way of marketing/ branding. It protects the food product from the external environment and adulteration, thus keeps it safe. It allows the consumers to relish the food as per their convenience (reheating and direct consumption) and holds the product of any size, shape and restrains during handling and transportation (Robertson, 2006).

Food packages can be altered or modified according to one’s requirement with features like single-serving dishes and portability. However, traditional packaging is lacking adequacy to meet unending consumer demands and product intricacies. Therefore, a contemporary concept of packaging with higher proficiency is needed to meet various consumer requirements. For instance, a packaging that can - enhance product’s shelf-life with lesser or no preservatives, that maintains freshness, that meets permissible regulatory requisites and enables tracking throughout the product life-cycle. Emerging technologies like smart packaging have the expertise to invigilate a product and its milieu and pursue any modifications into these. Moreover, smart packaging helps in gaining global market recognition, and meets international food safety standards. In recent years, there has been rapid development in food packaging that includes active packaging, intelligent packaging, or smart packaging. These are the technologies that deal with the packaging of food, beverages, cosmetics, and pharmaceutical products. Moreover, these terminologies are apparently identical but, each has a different function to deal with and is as follows:

Introduction

Biotechnology is defined as the ‘application of scientific and engineering principles to the processing of material by biological agents to provide goods and services’. The term ‘biotechnology’ is also used when a technique involving live organisms are employed to make or modify a product, improve plants or animals or develop microorganisms for specific uses. According to the definition of the Codex Alimentarius Commission (CAC 2001), modern biotechnology is defined as the application of (i) in vitro nucleic acid techniques, including recombinant deoxyribonucleic acid (DNA) and direct injection of nucleic acid into cells or organelles, or (ii) fusion of cells beyond the taxonomic family, that overcome natural physiological reproductive or recombination barriers, and that are not techniques used in traditional breeding and selection. Scientific developments of present world owe to processes and products of the field of biotechnology. Modern biotechnological advancements have played a major role in important branches of science such as agriculture, food processing, medicine and veterinary applications. Biotechnological interventions of the downstream processing applications include primary production areas namely breeding of crops and livestock, production of additives for food and feed and pharmaceuticals along with diagnostic tools. Inputs for food processing applications from biotechnology include biocatalysts such as enzymes, tracing food ingredients such as Genetically modified (GM) ingredients in end products of food and feed and food quality testing applications for food borne pathogens. Applications of modern biotechnology in form of genetically modified organisms have gained much importance in comparison to the downstream applications during food processing and food safety (Zhu, 2017). Food processing operations include transformation of harvested crop or animal produce into produce which are marketable with long shelf life and minimises waste and losses of raw produce in food chain and ensure their continuous availability in super market shelves. Food safety is an important area which assures of the food being safe for consumption. Food technological applications of modern biotechnology includes food enzymes that are important in various food processing applications in reactions involving lipids, carbohydrates and proteins, food fermentations to improve properties such as taste, flavour, texture, nutritional and shelf stability, food additives in form of bio preservatives, flavours, fragrances, genetically modified starter cultures, genetically modified crops, modern rapid diagnostic kits for food safety are discussed in detail.

Weaning foods

Introduction

Breast milk is natural and best for the growth and development of newborn babies. Although breast milk is adequate to provide an optimum nutrient till the age of six months but after that it is not sufficient to sustain optimum growth and fulfill their nutritional requirements. Various nutrients are required to supplement milk until child is ready to eat adult meal. This additional food along with the breast milk is referred as “complementary Food”. With adequate amount of complementary feeding breast-feeding continues up to two years of age and beyond so, referred as complementary feeding period.

Appropriate and adequate amount of complementary feeding helps in preventing malnutrition stunting and promoting growth. Introduction of this complementary food is called as weaning.

Weaning is the process of introducing adult food and beverage to the infant to support their growth and development. This is very crucial period in infant’s life. This is a period for diet transition as the nutrition requirements for growth and brain development is quite high. Introduction of various taste and texture promotes biting and chewing skills (Guthrie, 1975). Most six-month age children start eating semisolid foods. Weaning homogenized infant foods play a major role in the nutrition of infants (Martinez, 2004).As infants grow, their nutritional requirements also increase. To keep up this growing demand WHO recommends that infants start eating solid, semi-solid or soft foods at the age of 6 months to ensure sufficient nutrient intake.

Introduction

Oils and fats are utilized both for their food applications as well as for industrial purpose. As a food product, oils and fats are consumed in a variety of forms such as shortening, ghee, butter, margarine, cooking oil, salad oil, etc. Other uses include their usage in the form of lubricants, greases, soaps, cosmetics, paints as well as animal feed and biofuels. Among the Asian countries, Indonesia leads as the prime producer with more than fifty percent of the total palm oil production in the world. As a second-best producer of oils and fats, China was the major manufacturer of rapeseed as well as soybean oil in year of 2018. In general, Asian countries contributed to more than fifty percent of the total fat and oil manufacturing in the world in 2018 (Kushairi et al., 2018). Even though fats and oils are primarily utilized for food applications, there has been an increased interest in their industrial utility for the manufacture of biofuels. Fats manufactured from various animal sources like tallow or lard also contribute to a considerable quantity and compete with vegetable oils for the production of biofuels.

The resources for producing oils and fats are diverse depending on their end use, yet they are obtained from two major sources: animal sources and plant sources. Oils and fats are used as starting materials for the preparation of shortenings, margarines, and other tailored products that further act as functional ingredients in food products prepared by food processors, restaurants, and in home. They have been used for food and other variety of applications since the prehistoric times, due to their easy availability. For example, fatty tissues from animals liberate free-floating fats on being boiled, whereas oil can be pressed out from oil fruits and oilseeds.

The role of dietary oils and fats in human nutrition is also one of the important areas of interest. Over the time, oil and fat industry has provided significant contributions toward nutritional improvement of various products. With the growing concern linked between cardiovascular diseases and consumption of oil and fat products, low-calorie variants of different foods, free or low in cholesterol are also available now. Excessive fat consumption among the populations of developed countries and consequences of obesity has led to the development of reduced-fat and very-low-fat variants of foods.