eChapters

Introduction

Conservation Agriculture (CA) is a set of soil management practices that minimize the disruption of the soil’s structure, composition and natural biodiversity. These include: i) maintenance of permanent or semi-permanent soil cover (using either a previous crop residue or specifically growing a cover crop for this purpose); ii) minimum soil disturbance through tillage (just enough to get the seed into the ground); iii) regular crop rotations to help combat the various biotic constraints. CA also uses or promotes where possible or needed various management practices listed below: i) utilization of green manures/ cover crops (GMCC’s) to produce the residue cover; ii) no burning of crop residues; iii) integrated disease and pest management; iv) controlled/limited human and mechanical traffic over agricultural soils. When these CA practices are used by farmers one of the major environmental benefits is reduction in fossil fuel use and greenhouse gas (GHG) emissions.

In India, efforts to develop, refine and disseminate conservation-based agricultural technologies have been underway for nearly two decades and made significant progress since then even though there are several constraints that affect adoption of CA. Particularly, tremendous efforts have been made on no-till in wheat under a rice-wheat rotation in the Indo-Gangetic plains. The technologies of CA provide opportunities to reduce the cost of production, save water and nutrients, increase yields, increase crop diversification, improve efficient use of resources, and benefit the environment. However, there are still constraints for promotion of CA technologies, such as lack of appropriate seeders especially for small and medium scale farmers, competition of crop residues between CA use and livestock feeding, burning of crop residues, availability of skilled and scientific manpower and overcoming the bias or mindset about tillage. The need to develop the policy frame and strategies is urgent to promote CA in the region. (Bhan and Behera, 2014).

Indian agriculture is characterized by small farm holdings. The average per capita land holding is speculated to squeeze to 0.10 ha by 2050. The proportion of marginal holdings is to swell more due to the growing population, inheritance laws of division of land and diversion of agricultural land to non-agricultural purposes. But we need around 457 Mt food grains to feed our nation by 2050 as against the present level production of about 257 Mt. Significant changes are also taking place in domestic and international demand for crop products due to improvement in income and standard of living, fast urbanization, and changing life styles and food preference patterns. The food demand is projected to grow annually at 2.0 % for cereals as against 3-4 % for edible oils and pulses, 4-5% for milk and milk products, meat, fish, eggs, fruits, vegetables, sugar and gur. In contrast, association of emerging problems like declining per capita land availability, increasing nutritional insecurity, decrease in factor productivity, increasing risk with individual farm component, unsustainability of cropping systems and unwillingness of young farmers towards farming lead to an apprehension in achieving the target. Farming system which aims at long term productivity, profitability, recycling of resources and employment generation, comes out as a major strategy to tackle all such problems. In farming system, various components of farming are integrated based on the cardinal principles of minimizing the competition and maximizing the complementarity between the enterprises so as to improve productivity and profitability as well as resource conservation along with maintenance of the environment. A survey conducted by the AICRP on Integrated Farming Systems indicates existence of 19 predominant farming systems with majority (85%) as crop + livestock (Gangwar and Ravisankar, 2014). Crop dominant farming systems are existing in most of the states such as Andhra Pradesh, Bihar, Chattisgarh, Goa, Haryana, Jammu and Kashmir, Jharkhand, Kerala, Karnataka, Madhya Pradesh, North-East, Maharashtra, Odisha, Punjab, Tamil Nadu, Uttar Pradesh and Uttaranchal while livestock dominant systems, are present in Rajasthan and Parts of Gujarat. West Bengal, parts of Odisha and Assam states have the fisheries as a major source of income to the existing farming systems. The scope for promotion of horticulture (fruit) based systems exists in Jammu and Kashmir, Himachal Pradesh, Maharashtra, parts of Uttar Pradesh and in Sikkim while plantation dominant systems, are available in Andaman and Nicobar Islands and Kerala. Further, the contribution of crop and livestock to gross income of existing farming systems in 732 marginal households in 30 districts of 20 states in various NARP zones of India indicates that in majority of the place crop component contributes more than 50 % while at few districts such as Samba (Jammu), Aurangabad (Maharashtra), Mehsana and Panchmahal (Gujarat), livestock component contributes either equally or more. Thus cropping systems play a pivotal role in most of the farming systems of India.

The green revolution enhanced the food grain production by increasing  productivity of the arable crops as the only means of expanding output. The impact of this ‘revolution’ was first realized especially in the north Indian states of Punjab, Haryana, and western Uttar Pradesh. Since the new technology was based on use of seeds of high yielding varieties, increased use of irrigation and chemical fertilizers, pesticides and farm mechanization; the incremental gains in productivity of late began to end and food production started stagnating, and in many places it even acquired a decreasing trend. It is well accepted fact that ‘success always has its costs and green revolution has been no exception’. Critics of green revolution point to the environmental and health hazards due to increased use of agro-chemicals and the vulnerabilities that is there due to the spread of monocultures in which indigenous land races have been ignored and least emphasis was given on cropping systems based on crop diversification.

Indian agriculture is characterized by small farm holdings. The average farm size was only 1.21 hectares during 2005-10 and it would be 0.68 ha by 2030. Around 85% of farmers have land holdings smaller than 2 ha and they cultivate nearly 60% of the available land. The contribution of agriculture sector to the total (GDP) has decline from 38% in 1980 to 29% in 2000 and 15% in 2010-11. The per capita availability of land was 0.15 ha in 1999-2000, which will reduce to 0.11 ha by 2020. As per estimates, India would require about 345 million tones of food grains for feeding about 1.5 billion populations by the year 2020. Approximately 90% of total farm holdings are categorized as small and marginal. There is hardly any scope of horizontal area expansion. The situation is, further, aggravated due to globalization of market and trade relaxations, which call for competitiveness and efficient agricultural production system to face never challenges on the ecological, climatic, equity, social justice and employment front. In areas, endowed with adequate irrigation resources, short duration pulses, oilseeds and other high value crops will find their definite niche as sequential or intercrops, rather than replacing the major cereal crops having higher yield potential combined with high stability. Hence, an increased cropping intensity will contribute substantially to additional demands of food and cash crops.

Abstract

Crop diversity play important role of sustainable development. A study on crop diversity in Andhra Pradesh was conducted during 2010-2011. In Andhra Pradesh, cultivated crop plant species resulted in augmentation of 140 species belonging to 132 genera and 46 families. The maximum species strength was observed in the Rayalaseema region (127 species belonging to 120 genera and 43 families), followed by Telangana region (125 species belonging to 114 genera and 43 families) and parts of Coastal Andhra region (118 species belonging to 103 genera and 46 families). Species richness was predominant in cultivated crops like vegetable crops (31 species belonging 25 genera and 12 families), Fruit crops (25 species belonging 18 genera and 14 families), commercial crops (23 species belonging 23 genera and 15 families) and Leafy vegetables (12 species belonging 12 genera and 8 families). The maximum species richness in families was found in Fabaceae (16 genera and 19 species), followed by Poaceae (14 genera and 16 species), Cucurbitaceae (11 genera and 14 species), Asteraceae (7 genera and 7 species) and Apiaceae (5 genera and 5 species). The present and the past similar studies observed that many more native species remain in agriculture than previously thought, under the right conditions. There is a need to establish mechanisms of control on introduction of exotic species in natural habitats. We also need to strengthen the legislation on the use of biodiversity and to establish a research programme of the economic potential of local flora and fauna as an alternative to introduction of exotic species to safeguard our traditional crop diversity.

Crop evolution stands as a testament to the intricate dance between humans and nature, spanning millennia of coexistence and mutual influence. At the heart of agricultural history lies the story of how humble wild plants were transformed into the diverse array of crops that sustain humanity today. This narrative of adaptation, selection, and innovation not only shaped the course of human civilization but also continues to underpin the global food system in the modern era.
The Origins of Agriculture
The origins of agriculture mark a pivotal moment in human history, marking the transition from nomadic hunter-gatherer societies to settled agricultural communities. As early humans began to cultivate plants for food, they inadvertently initiated a process of selective breeding that would fundamentally alter the genetic makeup of these plants. Wild grasses such as wheat, barley, and rice were among the first to be domesticated, their seeds carefully harvested and replanted by ancient farmers who recognized their potential for sustenance.

Germplasm is the sum total of all the genes and their alleles present in a crop and its related species. Germplasm is also termed as genetic resources. It may be release as a variety, subjected to selection for developing a variety, and may be used as a parent in hybridization programme. They may be obtained from gene banks, center of diversity, gene sanctuary, farmer's field and seed companies.

Types of Germplasm

1. Land races

These are primitive varieties/cultivars. They are storehouse of genetic variability. Land races were first collected and studies by N.I.Vavilov in rice. They are the source of development of varieties in many valuable crops.

2. Obsolete varieties

The improved varieties of recent past are called as obsolete varieties. These varieties were breed by systematic breeding methods, were once commercially cultivated, but are no more grown. For example, wheat varieties K65, Ph591, many NP series etc.

Genetic resources deal with germplasm of a given species that provides the necessary genetic variation for the improvement of that species in terms of particular products, increased efficiency and higher levels of productivity. Genetic resources are, in this sense, the building blocks, fundamental not only to a crop improvement programme, but also for the very survival of the species in time and space (Swaminathan, 1983).

As agriculture is becoming more and more intensive and location-specific, plant breeding objectives are becoming more and more complex. Besides high yield, a modern variety is often expected to combine specific duration, nutritional attributes, adaptation to varying soil and water regimes, and resistance to ever-multiplying pests and diseases—to mention only a few of the character combinations. To meet these objectives, a wide range of germplasm must exist, and the plant breeder should have an easy access to the genetic resources.

ABSTRACT

Greenseeker is a handheld computer mounted sensor for observing normalized difference vegetation Index [NDVI= (NIR “R)/(NIR+R)], which may be used to estimate site specific amount of fertilizer nitrogen depending up on the crop condition. The sensor can be used for yield estimation and developing remote sensing based growth models. It is an active sensor with a built in light source for illuminating the target and records reflected light from vegetation at wavelength of 670 nm (red region) and 780 nm (near infrared region) of electromagnetic spectrum. The swath covered by the Sensor is 0.75 m when sensor is placed about 1.0 m above crop canopy.

The sensor was used to record NDVI in wheat- sugarcane intercropping system wherein wheat was grown on raised beds of 1.04 m width with six rows of wheat and sugarcane in furrows at row spacing of 1.38 m. The wheat variety PBW 343 was sown with nitrogen levels @ 0, 30, 60, 90, 120, 150, 180 and 210 kg N ha^-1 (all basal) and sugarcane variety CoSe 92423 was planted in furrows on 7^th November, 2006 in a medium textured loam soil.

The NDVI was recorded in wheat at 17, 41, 59, 73, 88, 113 and 129 DAS using Greenseeker and Spectroradiometer (UNISPEC ^TM of PP system, USA) simulating normal satellite bands i.e.

NIR: 770-860 nm, Red: 620-680 nm, Green: 520-580 nm. The maximum NDVI (recorded at 88 DAS) was used to develop INSEY “ yield relationship in wheat. The NDVI recorded by Greenseeker was integrated with NDVI recorded by Spectroradiometer.

The Greenseeker was also used to monitor crop growth in sugarcane. The NDVI was correlated with shoot population, plant height, LAI and total biomass during formative and crop elongation phase of sugarcane till end of November 2007. Highly significant (at 1%) correlation was observed between GS- NDVI and shoot population till mid August and LAI in sugarcane for entire crop cycle. An exponential model (R² = 0.9017) was developed to estimate LAI of sugarcane from NDVI. The NDVI was significantly (at 5 %) was correlated with plant height till mid August. However, the correlation between total crop biomass in sugarcane and NDVI remained non-significant.

Abstract

This paper portray the generation of spectral signature library for semi arid area crops using hyperspectral data and the scope of the application of the generated digital library for the classification of the satellite imagery of similar regions.

Hypersprctral data have narrow bands which help to provide additional information related to observed features. In case of this agriculture study crop related information are gathered using hyperspectral sensors The variation in the observations are due to physic-chemical characteristics such as biochemical composition, physical structure, water content and plant ecophysical status. Using the hand held spectroradiometer the reflectance is captured for the bajra, moong, moth crops from the Rajasthan, India’s semi arid region. The observations have been taken for different dates considering the phenology of the crops. Hyperion data from EO-1 satellite have been used to implement the classification operation based on the spectral signature library of bajra. It is observed that the image with the crops can be classified according to the phenology difference.

The term ideotype was proposed by Donald in 1968. Ideotype is a biological model which is expected to perform in a predicted manner in a defined environment. A crop ideotype is a plant model that is expected to perform better in a particular environment. The concept of ideotype changes from crop to crop, climate to climate and the concepts and policies of the community concerned. Ideotype breeding is the development of a plant type, expected more quantity of grains, with ideal character. Plant characters are selected from an agronomic point of view.

For crop improvement and more specifically to develop new varieties a number of plant breeding methods are available. CSIR-NBRI from very beginning selected all available techniques and standardized their practical application for all ornamental crops. All crop specific basic information was collected/generated for successful application of techniques for development of new varieties by creating genetic variability. Ornamental plant species fall into two main categories. In the first group the plants that are capable of sexual reproduction, but are commercially propagated vegetatively. The second group of plant species are the apomicts. In obligate apomicts hybridization fails to generate any variability. For development of new variety creation of genetic variability is pre-requisite. Breeder should have all up-to-date knowledge about all the available techniques and their merits and demerits for improvement and development of new varieties.

3.1. INTRODUCTION TO PLANT BREEDING

What is Plant Breeding?: Plant breeding is an art and science which deals with changing genotypes of the plants, to adapt them to the service of human being. (or) The application of genetic and cytogenetics principles in crop improvement are called plant breeding.

Specific objectives of plant breeding: The main objectives of the plant breeding is to improve the characteristics of crop plants which are agronomically and economically desirable

7.1. Crop insurance

Helps in stabilization of farm production and income of farming community.

Helps in optimal allocation of resources in production process.

Crop insurance is sold and bought in a market.

Has a limited role in risk management in farming.

Any limitations to scope for effective and economic crop insurance can change over time.

7.1 Introduction

Agriculture production and farm incomes in India are frequently affected by natural disasters such as droughts, floods, cyclones, storms, landslides and earthquakes. Susceptibility of agriculture to these disasters is compounded by the outbreak of epidemics and man-made disasters such as fire, sale of spurious seeds, fertilizers and pesticides, price crashes etc. All these events severely affect farmers through loss in production and farm income, and they are beyond the control of the farmers. With the growing commercialization of agriculture, the magnitude of loss due to unfavorable eventualities is increasing. The question is how to protect farmers by minimizing such losses. For a section of farming community, the minimum support prices for certain crops provide a measure of income stability. But most of the crops and in most of the states MSP is not implemented. In recent times, mechanisms like contract farming and future s trading have been established which are expected to provide some insurance against price fluctuations directly or indirectly. But, agricultural insurance is considered an important mechanism to effectively address the risk to output and income resulting from various natural and manmade events. Agricultural Insurance is a means of protecting the agriculturist against financial losses due to uncertainties that may arise agricultural losses arising from named or all unforeseen perils beyond their control (AIC, 2008). Unfortunately, agricultural insurance in the country has not made much headway even though the need to protect Indian farmers from agriculture variability has been a continuing concern of agriculture policy. According to the National Agriculture Policy 2000, "Despite technological and economic advancements, the condition of farmers continues to be unstable due to natural calamities and price fluctuations". In some extreme cases, these unfavorable events become one of the factors leading to farmers suicides which are now assuming serious proportions.Agricultural insurance is one method by which farmers can stabilize farm income and investment and guard against disastrous effect of losses due to natural hazards or low market prices. Crop insurance not only stabilizes the farm income but also helps the farmers to initiate production activity after a bad agricultural year. It cushions the shock of crop losses by providing farmers with a minimum amount of protection. It spreads the crop losses over space and time and helps farmers make more investments in agriculture. It forms an important component of safety-net programmes as is being experienced in many developed countries like USA and Canada as well as in the European Union. However, one need to keep in mind that crop insurance should be part of overall risk management strategy. Insurance comes towards the end of risk management process. Insurance is redistribution of cost of losses of few among many, and cannot prevent economic loss. There are two major categories of agricultural insurance

Abstract
Crop management and improvement are central to advancing agricultural productivity and sustainability. This comprehensive chapter delves into the strategies and techniques used in modern crop management and the ongoing innovations driving crop improvement. Covering topics such as crop rotation, soil management, pest and disease control, and the application of biotechnology, the chapter provides a detailed analysis of how these practices contribute to higher yields, enhanced quality, and environmental sustainability. The discussion also explores the role of precision agriculture, breeding technologies, and genetic modification in addressing the challenges posed by climate change, resource limitations, and changing market demands. By examining the latest advancements and best practices, this chapter offers
valuable insights into the future of crop management and improvement.
Keywords: Crop management, crop improvement, crop rotation, soil management, pest control, disease management, biotechnology, precision agriculture, genetic modification, sustainable agriculture.

With the current food production level of 275.11 million tonnes, India has to step up food grain production by next decade to feed the burgeoning population (Report Ministry of Agriculture). India with 2.3% of the global geographical area, supports about 16.8% human population, 20% of the world’s livestock. However, per capita availability of land for producing agricultural commodities has declined from 0.34 ha in 1951 to about 0.23 ha in 1980 and 0.15 ha in 0.15 ha during 2015 and it is expected to decline further to about 0.09 ha by 2050 A.D. With the possibility of horizontal expansion or putting more land under cultivation being remote, further augmentation in yield in Indian agriculture will be forced more and more into marginal or problematic soils accompany about 57% geographical area with increasing competition for good quality lands.

Problem soils are an important ecological entity of arid, semiarid or humid climate of our country. In India saline and sodic soils are serious threat to produce enough food grains for growing population. The other main problem is acid and acid sulphate soil, spread in one third of cultivated land.

Problem soils are either deficient in plant nutrients or the nutrient availability is inhibited by the antagonistic effect of the nutrient element present in excessive amounts as soluble or exchangeable ions.

The problematic areas for crop production may be soils affected with acidity, high concentration of salts, water logged soils or soils in steep sloppy areas. These soils have limitations or ill effects for crop growth and productivity.

The subject on micrometeorology deals with small scale meteorology of near ground surface with its related elements of both physical and biological processes. When this micrometeorology is integrated for crop production purposes, then it becomes crop micrometeorology, which is very important in the science of agricultural climatology. This crop micrometeorology gets varied with the architecture of the crops grown, available soil moisture, agronomical practices followed, soil texture, topography of the area, the nature of climate and weather that prevails etc. The soil surface heat, exerts a profound frictional effect on wind movements and hence it is different from the air layers at higher levels. These special features constitute the microclimate, which is modified compared to a flat bare surface by factors like topography, nature of soil surface, presence of vegetation and type of vegetative cover. The presence of crop canopy leads to distinct differences in the thermal and humidity regimes of the soil, the air layers immediately above it and the distribution of radiation and wind profiles inside the canopy. The study on the physical exchanges of the transfer of heat, momentum and moisture in the microclimatic region is called as micrometeorology (Venkataraman and Krishnan, 1992).

Radha Krishna Murthy (2002) reported that the micrometeorology is the micro scale of both the physical and meteorological factors that are taking place within the ecosphere. The ecosphere means the area between just above the crop canopy and just below the root zone of a crop. Further he was on the opinion that the microclimate of valley is important as compared to the entire climate of the mountain for the bio-life of valley. For the crops purpose, the microclimate is the climate of the ground surface to top of the crop canopy or otherwise it can be called as crop’s climate, a modified one from the Stevenson’s Screen climate/weather observation.