eChapters

Soil is a major source of nutrients needed by plants for growth. The three main nutrients are nitrogen (N), phosphorus (P) and potassium (K). Together they make up the trio known as NPK. Other important nutrients are calcium, magnesium and sulfur. Plants also need small quantities of iron, manganese, zinc, copper, nickel, chlorine, boron and molybdenum, known as trace elements because only traces are needed by the plant. The primary nutrients are nitrogen, phosphorus and potassium, because they are required in larger quantities than other nutrients. These three elements form the basis of the N-P-K label on commercial fertilizer bags. As a result, the management of these nutrients is very important. However, the primary nutrients are no more important than the other essential elements since all essential elements are required for plant growth. Remember that the ‘Law of the Minimum’ tells us that if deficient, any essential nutrient can become the controlling force in crop yield.

Plants require altogether 17 essential elements to nourish themselves and to complete their reproduction and life cycle. Among them nine elements are required in large amounts for their growth, the so called macro nutrients like C, H, O, N, P, K, Ca Mg and S.  The former three elements (C, H and O) are available to the plants through air and water over which we have relatively little control either in their application rates or uptake into plant system.

Salt affected soils occupy 962.2 m ha globally which accounts for 33% of the arable land. In India 8.373 m ha is affected with salts. Of which 2.359 m ha are alkali soils, 3.829 m ha are saline soils and 2.185 m ha coastal saline soils. Reclamation of these soils provides additional area for food grains production and employment.

Soil is the fundamental resource in the agricultural production systems and monitoring its fertility is critical to the sustainability of agriculture. Plant nutrients undergo different transformation processes through which they are converted from unavailable to available forms. Nutrient cycling thus involves the transformation and availability of nutrients and is mediated by microbial action. Understanding the dynamics of nutrient and soil organic matter transformations requires an understanding of the biological, chemical, and physical processes involved.

7.1. Soil Nitrogen

Introduction

India is emerging as a major stake holder in the global horticulture scenario. More emphasis is given to underutilized fruits due to their high nutritive and medicinal value in addition to being resistant/tolerant to many biotic / abiotic stresses. Jamun (Syzygium cuminii Skeels), fruits are used as an effective medicine against diabetes, heart and liver trouble (Singh and Singh, 2012). The powder of seeds has high value being useful in the treatment of diabetes. Therefore, the jamun fruits are having high value in terms of therapeutic and nutrition. Fruits and seeds of tamarind have tremendous potential for industrial use. Mahua (Bassia latifolia) is a boon for tribal farmers of Gujarat. The corolla commonly called as mahua flowers is a rich source of sugar containing appreciable amount of vitamins and minerals. Flowers (fresh and dried) and spent flowers (after fermentation) are also used as feed for livestock. Fruits are eaten as raw or cooked. Seeds are good source of oil. The oil obtained from Mahua kernel is used for edible purpose and permitted for preparation of vegetable oil. Mahua oil is used in manufacture of soap, lubricating grease, fatty alcohols and candles. Chironji (Buchanania lanzan Spreng) is excellent tree of agro forestry and social forestry. The flesh of ripe fruit is very palatable and the oily kernels are good source of protein (28-30%) and are used in preparation of sweets. Kernel oil can be used to substitute olive and almond oil. Khirni (Manilkara hexandra) thrives well on rocky, gravelly, saline and sodic soils and is good source of sugars and antioxidants. It is being used commercially as rootstock for sapota. Tamarind has tremendous potential under semi arid conditions (Singh and Singh, 2013). The medicinal properties of the bael (Aegle marmelos Correa) fruit are due to high marmelosin content. The pulp of mature bael fruit is very effective to cure dysentery and diarrhoea Varieties on jamun (Goma Priyanka and Thar Kranti), bael (Goma Yashi, Thar Divya and Thar Neelkanth), tamarind (Goma Prateek) and chironji (Thar Priya) have been developed. These varieties are precocious bearer with good yield and quality attributes and suitable for high density planting. These minor fruits have potential in secondary agriculture through value addition. Minor fruits have been conserved at the station and it has great potential under semi-arid regions of western India.

Successful orchard establishment requires careful planning of site, climate, soil, water, planting material, spacing, and crop architecture. This chapter explains principles of orchard planning and establishment, including site evaluation, land preparation, layout, pit preparation, planting systems, and selection of suitable cultivars and rootstocks. Traditional and modern planting systems, including high-density and ultra-high-density systems, are discussed in relation to light interception, productivity, mechanization, and efficient resource use. Proper orchard design also facilitates irrigation, fertigation, pruning, harvesting, and plant protection. The chapter emphasizes long-term planning because perennial horticultural crops remain productive for many years and early establishment decisions strongly influence future orchard performance.

Introduction

Organic farming is a comprehensive approach to production management that promotes and improves Agro-health, ecosystems including biodiversity, biological cycles, and soil biological activity. It prioritizes management approaches above off-farm inputs, and agronomic, biological, and mechanical farming procedures are used rather than synthetic resources (Ajibade, Ayinde, and Abdoulaye 2020). The term “organic farming” refers to a production technique that excludes the use of artificially formulated fertilizers, pesticides, or growth regulators for agronomic practices or the use of different chemicals for livestock production, i.e., feed additives, growth promoters and antibiotics, etc. (M. Singh 2021).

The terms such as organic, natural, biological, biodynamic, altemative and sustainable farming have entered the agriculture vocabulary. Inspite of these differences in terminology, basically identical ideologies, ideas and technologies are reflected. The common objectives of all the system are to develop farming methods to restore, maintain or build-up soil productivity, to protect the environment instead of causing pollution, produce safe and healthy food, and preserve or help the small farmer.

In Japan, the farmers study the nature, learn from it and apply the knowledge on their farms. For instances growing plots should also be mulched with straw or plant residues, this imitates the conditions in natural forest where ground is never bare. Instead of using pesticides, strong herbs or plants can be grown around vegetable plots to ward off the insects. To keep the soil health natural, organic fertilizers are used. Soil microorganisms and earthworms take care of the processes involved in decomposition and mineralization of the organic substances, fix atmospheric nitrogen, solubilise insoluble forms of phosphate and produce natural growth promoting substances and antibiotics,

The concept of sustainable agriculture is gaining acceptance and momentum because of rapid degradation of natural resources, increase in the cost of production in conventional agriculture system and deterioration in the quality of rural life caused by environmental pollution. Moreover it is risky and uneconomical to practise conventional agriculture in over 70 percent of the cultivated area in India which is presently under rainfed farming. Much of the know how to practice organic farming models has rested on the individual farmers till now. They however do not have the benefit of appropriate technology and scientific information and also institutional support to ensure success of the new farming system.

The organic constituents of soils or soil organic matter is the most essential components of soil consisting of plant and animal residues at various stages of decomposition, cells and tissues of living or nonliving organisms and the substances synthesized by their decomposition. Soil organic matter exerts profound effect on soil productivity as it acts as source and sink of plant nutrients especially nitrogen and sulphur. It also involves in major biochemical processes to transform or release of plant nutrients into their available forms. Thus, it plays vital role in soil fertility maintenance, through increasing cation exchange capacity and improving soil physical properties, such as bulk density, aggregation, water retention capacity and also supports all kinds of biological activities in soil. The soil organic matter mostly concerns only with dead organic fractions formed from the decomposition of original plant and animal residues using as a source of food and energy by the soil microorganisms. It can be distinguished into –

Word manure derived from French word ‘Manoeuvrer, means to manipulate, to work, to produce crop.

2.1. Sources of organic wastes

Cattle shed wastes-dung, urine and slurry from biogas plants.

Human habitation wastes-night soil, human urine, town refuse, sewage, sludge and sullage.

Poultry litter, droppings of sheep and goat.

Slaughter house wastes-bone meal, meat meal, blood meal, horn and hoof meal, fish wastes.

Byproducts of agroindustries-oil cakes, bagasse and press mud, fruit and vegetable processing wastes.

Farmyard Manure is the manure prepared by using the mixture of dung and urine soaked litter by microorganisms.

Good farmyard manure is one

Word manure derived from French ‘Manoeuvrer, means to manipulate, to work, to produce crop.

11.1. Sources of organic wastes

Cattle shed wastes, dung, urine and slurry from biogas plants.

Human habitation wastes-night soil, human urine, town refuse, sewage, sludge and sullage.

Poultry jitter, droppings of sheep and goat.

Slaughterhouse wastes-bone meal, meat meal, blood meal, horn and hoof meal, fish wastes.

Byproducts of agro industries-oil cakes, bagasse and press mud, fruit and vegetable processing wastes etc.

Before the discovery of chemical fertilizer in early 20^th century, organic manures and growing of legumes were the ways of replenishing soil fertility. The only other way was leaving land fallow for a few years before its re-cultivation, a practice followed in shifting cultivation (jhuming) (Garbyal, 1999). This was also true for India, where although the ?rst single superphosphate plant was set up in 1906 in Ranipet (Tamil Nadu), the real use of fertilizer started with the manufacture of urea, the ?rst plant for which was set up in 1959 at Sindri (Bihar) (Tandon, 2014). Organic manures could meet crop-nutrient needs in early days because the average grain yield of most cereals was about 1.5–2.0 t ha^–1, while the average yield of pulses was 0.5–0.75 t ha^–1. However, the crop production scenario changed rapidly after the introduction of dwarf, high-yielding varieties of wheat from Mexico, which led to the “Green Revolution” (Swaminathan, 2013). This was followed by the development of semi-dwarf, high-yielding varieties of rice and hybrids of maize, sorghum and pearl millet. These varieties/ hybrids of cereals needed 100–150 kg N ha^–1 in one growing season, and this could be met only by urea or other N fertilizers; organic manures had no chance and their use became almost nil over a period of next 25 years or so. Well-off young farmers cannot even think of making manure heaps or compost pits, the job is too hard and not a clean one. However, what is ignored is the fact, that organic manures not only supply plant nutrients but also build up soil organic matter, which improves soil physical properties, helps in storing moisture and is the elixir of life for the soil biota (Lal, 2014). A large numbers of reports are available on the effect of adding organic manures and crop residues on improving soil physical (Hati et al., 2007; Brar et al., 2015) and chemical and biological properties of soil (Prasad et al., 1999; Prasad and Mishra, 2001;Sharma et al., 2009; Prasad et al. 2014). Thanks for the organic farming (Prasad, 2005), the interest in organic manures and composts has increased in India and it is now a sought after material. However, it has not entered the main stream of crop production.

5.1. Organic matter

In sandy soil, the sticky and slimy organic materials cement the sand particles together to form aggregates.

In clayey soil, it modifies the properties of clay by reducing its cohesiveness and making clay more crumby.

The soil microorganisms thrive on organic matter in soil by feeding readily on soluble substrates and rather slowly on insoluble substrates. Organisms derive carbon and energy during the process of organic matter decomposition and release organically-bound carbon, thereby decrease C :N ratio and utilize nutrients. Any decrease in organic matter content in soil is likely to affect the microbial biomass and their activities thereby influence the soil fertility and productivity. It is, therefore, imperative to recycle the organic matter in soil in whatsoever form it may be. The raw organic matter requires appropriate treatment to boost decomposition process.

Solid wastes, which are left after the fermentation process is complete, may be potential sources for use as fertilizers and feed stuffs.

I. Antibiotic Fermentation Wastes

Antibiotics are produced by microoganisms and have capacity, in dilute solution, to inhibit the growth or even destroy the other microorganisms. They are produced on a large scale using fermentation process except chloroamphenicol which has been produced synthetically since 1948. Solid wastes remaining after the liquid containing the antibiotic has been extracted from the fermentation broth need to utilised. This is usually done by filtration. The solids are a heterogeneous mixture of hyphae of the producing organism, unused media, defoaming oils and metabolic products of the micro-organisms, the most important of which is residual antibiotic. The levels of residual antibiotic can vary a great deal.

Sustainable horticulture seeks to produce nutritious and economically valuable crops while conserving soil, water, biodiversity, and other natural resources. This chapter examines organic, natural, and broader sustainable production systems and their underlying principles. Topics include organic inputs, compost, biofertilizers, biological pest management, crop diversification, mulching, recycling, soil-health improvement, and reduced dependence on synthetic inputs. Certification systems and market requirements are also considered, including Indian and international organic standards. The chapter distinguishes different production philosophies while emphasizing practical sustainability. Successful systems must maintain productivity, profitability, environmental quality, and consumer confidence. Sustainable horticulture therefore combines ecological principles with sound crop management, market awareness, and responsible resource use

Introduction Organizational structure and management represent fundamental dimensions of community mobilization that determine how collective efforts are organized, coordinated, and sustained over time while building institutional capacity for effective action and long-term development success. The design and implementation of appropriate organizational arrangements significantly influence the ability of community groups and development organizations to achieve their goals while maintaining community ownership, democratic participation, and adaptive capacity that can respond to changing circumstances and emerging opportunities. The complexity of contemporary community challenges requires sophisticated organizational approaches that can coordinate diverse activities and stakeholders while maintaining flexibility and responsiveness to local conditions and community preferences. Effective

During the 19^th century various hypotheses were advanced about the origin of earth. These hypotheses can be grouped into two general classes:

1. Monistic hypotheses: The pioneers of this hypotheses believed that only one mass or body was responsible for the creation of the solar system. The representative of this theory is Nebular hypothesis. The advocates of this hypothesis were Kant and Laplace.

2. Dualistic hypotheses: The advocates of this hypothesis believed that two separate masses or bodies were responsible for the creation of the solar system. The representatives of this hypothesis are Planetesimal hypothesis and Tidal hypothesis. The pioneer of Planetesimal hypothesis was the great English scientist T. C. Chamberlain. The Tidal hypothesis was advocated by another English geographer named James Jeans.