eChapters

Introduction

The arid regions in India occupy 38.7 million ha (Mha), comprising 31.7 and 7 Mha under hot and cold arid region, respectively. The major part (90%) of the hot arid region lies in Northwest (NW) India and the rest in geographically isolated pockets in South India. The NW arid region extends from 22°30” to 32°50” N and 68°50” to 75°45”E , bounded by Aravalli hills in the east, Thar desert in the west the irrigated Indus plain in the north and the alluvial plains of the Sabarmati river in the south. The region mostly lies in western Rajasthan covering 12 districts (196150 km², 68.7%) followed six districts in northwest Gujarat (62180 km² 21.8%), five districts in southwest Haryana in (12840 km² 4.5%), and six districts in southwest Punjab in (14510 km², 5.0%) (Fig.1). The region is characterized by low rainfall (100 to 400 mm yr-1), that is also erratic and highly unpredictable (coefficient of variation, CV = 30 to 70%); high evaporation (1600 to 2000 mm yr-1); temperature extremes (-5.7° C to 50°C); frequent droughts (once in 2.5-5.0 years); strong winds (20-50 km h-1) during summer; and short crop growing period (8 to 15 weeks) (Moharana et al., 2016). Despite the common characteristics of aridity and extremes of temperatures, there are enormous spatial variations in terms of rainfall pattern, physiography, soils, amount of available surface and ground water, and extent of vegetation cover (Joshi, 2012). Accordingly, the NW hot arid region has been classified in 4 sub-regions, 11 zones and 34 sub zones (Faroda et al., 1999).

Despite these intimidating conditions, the region supports a large human and livestock population and biodiversity. However, the ever-increasing human and livestock population and developmental activities exert enormous biophysical pressure on the slender natural resource base of the region. A major challenge is desertification due to wind erosion/deposition, water erosion, water logging and salinity. Degradation of permanent pastures has led to loss of fodder resources constraining livestock husbandry, the backbone of the economy of the region. Of late, industrial effluents and mining are also contributing to desertification.

The introduction of high yielding varieties, additional irrigation facilities, a great input flow through fertilizers and pesticides, farm mechanization, credit facilities and other rural infrastructure facilities ushered in the green revolution. The food grains area under irrigation as a percentage to its total sown area has been increased from 20.9 to 51.2%, rice irrigated area from 36.5 to 58.3%, wheat from 43.1 to 93.4%, pulses from 9.4 to 18.6%, oilseeds from 3.7 to 28.6% during the period from 1965-66 to 2013-14 (DES, 2015). Despite the net sown area being stagnant around 140.80 M ha, gross cropped area has been increased significantly from 155.28 M ha in 1965-66 to 195.25 M ha in 2011-12 due to increase in net irrigated area from 26.34 to 65.26 M ha (Fig. 1), gross irrigated area from 30.90 to 91.53 M ha during the period. There has been a sharp decline in average size of operational land holdings. The scope for expansion of the area available for cultivation has become limited. The average size of holdings for all operational classes (small & marginal, medium and large) have declined over the years and for all classes put together it has come down to 1.16 ha in 2010-11 from 2.28 ha in 1970-71. Therefore, it is the urgent need to use the natural resource like water efficiently and in a sustainable manner.

Introduction

In the post-world trade organization (WTO) era, the fantastic imagination of “one world for self-reliance”, has been shattered by the Corona induced calamity and the expansionists approach of a few rouge nations. Though the global welfare and peace has always been part of Indian traditional philosophy, approach and the concept of self-reliance, the practical boundary of self-reliance in its present context, starts from the country level itself. The idea of self-reliance at multiple levels (individual, family, society, and nation) has driven human civilization for most of its efforts, inventions and actions across the world.

A very high dependency of a large number of population on the natural resources in the developing world calls for proper management of natural resources for self-reliance. Since the early days of civilization, natural resources in the form of land, soil, water, biodiversity and climate have remained the very basis of supporting and sustaining life of human beings, plants and animals on the earth. However, in recent times intensive use and over-exploitation of pristine resources have robbed them of their legendry resilience. To effectively tackle the complex problems and to fulfil basic needs of livelihood, food security, poverty, employment, equity and environmental services, efficient and judicious utilization of natural resources for enhanced and sustained productivity is a matter of serious concern for policy makers, planners, scientists, conservationists and environmentalists.

Edible oil scenario

Vegetable oil or edible oil is the main source of energy in humans and it also supplies nutrients for growth and maintenance of human body. Edible oil demand in India has been increasing progressively since last one decade, primarily due to population growth, improved standard of living and also changes in food habits. Presently, the area under oil seed production is between 26 and 27 million ha with an average yield of 1000 to 1100 kg ha^-1. This accounts to 7.5 to 8.0 million tonnes of vegetable oil production locally, as against the current demand of 22.5 to 23 million tonnes per annum.

Introduction

It is known and well documented that ‘biological diversity’ (i.e. diversity within species, between species and within ecosystems) has been declining at a much faster rate than earlier time in human history. The current rate of extinction is tens to hundred times higher than the average over the past 10 million years and it is accelerating (IPBES, 2019). The estimates of the number of species getting extinct every year vary from low (200 to 2,000) to high (10,000 and 100,000) (Bar-On et al., 2018). The delicate balance of clean air, water and biodiversity in nature which helps in survival on earth, is rapidly being destroyed due to humans’ activity like growing of food, producing energy, dispose of waste and consume resources (IPBES, 2019). The current human population of the world (7.6 billion) represents only 0.01% of all living creatures and attributed to be instrumental in causing loss of 83% of all wild mammals and half of plants (IPBES, 2019). These unprecedented changes in important components of biodiversity are likely to continue or increase in the foreseeable future, unless we take active corrective measures (IPBES, 2019).

Whilst all biodiversity has intrinsic economic or social value, it is the ‘agricultural biodiversity’ (‘agrobiodiversity’ in short) that has the greatest importance for food nutrition and health security of humans. The FAO has recently defined biodiversity for food and agriculture (BFA) as a subset of biodiversity that contributes primarily to agriculture and food production (FAO, 2019). It includes the domesticated plants and animals raised in crop, livestock, forest and aquaculture systems, harvested forest and aquatic species, the wild relatives of domesticated species, other wild species harvested for food and other products. It also encompasses “associated biodiversity”

Introduction

Agriculture is the backbone of Indian economy. Good harvest helps in moving the economy in the right direction. The agriculture sector accounts for 17% of US$ 2.6 trillion economy of India (Anonymous, 2019a) and employs 54.6% of the country’s workforce (Anonymous, 2019b). India occupies first place in the production of pulses, jute and milk, and second place in rice, wheat, cotton, sugarcane, vegetables and fruits (FAO STAT, 2020). The agriculture export constitutes a fifth of total exports made by India and self-reliance in agriculture is required to become an economic superpower. The green revolution has paved the way from begging bowl to overflowing granaries in our country. The overall food production has increased from 52 MT in 1950-51 to 295 MT in 2019-20, which is a phenomenal growth of more than five times in seven decades span. Of the several factors that influenced the sea change in agriculture production and productivity, the quality seed of improved varieties occupies a crucial position. The green revolution was ushered in by the import of 18000 tonnes of seed of high yielding wheat varieties Lerma Rojo and Sonara 64 and rice variety IR-8. Till today, the quality seed alone contributes to 15-20% of total production (Chauhan et al., 2015), indicating its importance in agricultural production of the country. The problematic global scenarios like economic recession, climate change, water scarcity, population explosion, pollution or new pandemics drives the states to be more self-reliant. To be self-reliant is not to be altogether “self-contained”. We should be opened for the best material available anywhere in the world, and simultaneously we should develop our infrastructure and industry to cater to the needs of our population as well as export to other countries. Seed sector is one of the potential areas for boosting self-reliance as well as has a lot of export potential. The government push for self-reliance under the present COVID-19 pandemic situation by infusing INR one lakh crore as agricultural infrastructure fund that will help in developing several start-ups. The success of this movement mainly depends on innovations in every sector, including the seed sector and simultaneously, there is a need to extend it to the regulatory mechanisms. This chapter will discuss the possible areas of innovations that are already in the pipeline and those to be targeted in the areas of seed production, quality assurance, marketing and regulation along with policy interventions needed to boost the seed sector.

Introduction

India has progressed well on food production from 51 million tonnes (mt) in 1947, 286 mt in 2018-2019 owing to the largest contribution from wheat and rice (about 213 mt). But simultaneously our population has also grown to about 135 billion in 2018. Therefore, the impact of higher production is not realized in absolute terms. Indian agriculture has come a long way since independence achieving food security in major crops, declining rate of rural poverty, rise in agricultural incomes and nutrition levels have gone up. Higher production has also been recorded in sugar, cotton, oilseeds, fruits, vegetables, milk, fisheries and poultry. All this has made us a proud with achieving self-sufficiency in food security. However, on the socio-economic front, the picture does not become rosy as we have a lower strength of socio-economic development indicators even among developing countries. Still the reports of under nourishment, hunger and poverty rings the bell. However, the importance of agriculture cannot be negated because it provides sustenance to mankind, food and employment to all. Considering the emerging challenges of climate change impacting agricultural productivity and increasing variability, poor investment in research, skill development of farmers, post-harvest losses etc. New strategies and innovations in agriculture, particularly on the development of climate resilient varieties with high productivity and better nutritive quality are called for, which has to be led by structural reforms and infrastructural augmentation.

Introduction

India is one of the agriculturally important countries in the world and has strong net-work of agriculture education, research and extension. As per the historical record India is committed to thrive and excel independently. During 1965–66, India imported food grains from the US under PL-480 scheme, and the situation was “ship-to-mouth”. This condition was also exacerbated with the growing population which made India to increase its food production at most priority with commitment. With the introduction of high yielding semi dwarf varieties of rice from IRRI, The Philippines and wheat from Mexico which combined with right policies of government to provide essential inputs and market facilities, credit etc. revolutionized the Indian agriculture. In addition to these innovative ideas and policies the food production reached to the level of self-sufficiency until today. For instance the food production during 1950-51 was 54 million tonnes and reached to 285 million tonnes during 2018-19. After the fourth five year plan, India made its stand of self-sufficiency even affected by any year of worst drought. Later, the focus had been given on agricultural research and education in the country for sustaining self-sufficiency in agriculture sector at all times of change of conditions within the country and also globally. Although more than 65 per cent of rural population is depend on agriculture sector, the average monthly income is about Rs. 6500. It reveals that under employment and large population in India depend on agriculture which is unsustainable (Rena, 2003). Therefore, it is needed to books the rural economy, create new infrastructure and other innovations in this sector. India has been emphasizing for innovative techniques. The main advantage for India is the richest natural resources and need only planning and execution on innovation front.

Introduction

Over the past decades, agriculture sector played a crucial role in enhancing the economic growth of India, and will continue so in future. It employs 55% of the workforce, thereby contributing to 17.1% of the country’s Gross Value Added (GVA) for the year 2017-18 (MoA & FW, 2019). Agricultural production in India grew at an average of 3.6% annually since 2011, thanks to the policy decisions on inputs including improved fertilizer delivery systems and high yielding varieties. Release of improved varieties in cereals, pulses, fruits, vegetables and ornamental flowers as well as high-yielding breeds in the livestock and fisheries sectors has increased the diversification. Availability of a range of nutrition rich food commodities played crucial role in reducing undernourished population from 24% in 1990-92 to 15% in 2014-16 (OECD, 2018, FAO statistics). India is currently the largest product export economy of the world. India is leading exporter of rice globally, amounting to 8.34 Mt in 2019, and currently holds >85% of global basmati rice exports. The country has shown massive resilience to very recent global outbreak of COVID-19, and managed to tackle the social and economic challenges with a spirit of self-reliance. The ‘Atma Nirbhar Bharat Abhiyan’ by Government of India with a special economic package of Rs 20 lakh crore to enable the resurgence of the economy through three mantras, ‘innovation, integrity and inclusion’ as suggested by none other than the Hon’ble Prime Minister of the country. It is therefore imperative that the agricultural sector too needs new initiatives to continue with the success, and realize the potential of self-reliance.

India is endowed with varied types of soils and this could be attributed varied relief features, landforms, climatic realms and vegetation types in the subcontinent. In ancient times, soils used to be classified in India into fertile and sterile soils. Later, the inherent characteristics and external features of soils such as texture and colour, were used to classify the soils. Based on texture, soil types were identified as sandy, clayey, loam, etc. In terms of colour, they were red, yellow, black, etc.

Scientific surveys of soils in India have been conducted by various agencies since independence. All India Soil Survey Organization, established in 1956, carried out detailed soil surveys in the catchment areas of major river valley projects like the Damodar Valley. Later, the National Bureau of Soil Survey and the Land Use Planning (NBSSLUP) ofthe Indian Council of Agricultural Research, established in 1976, made extensive studies on Indian soils and classified them as per the USDA SoilTaxonomy

Soil quality is the capacity of the soil to function, within its natural or managed ecosystems, to sustain plant and animal productivity, maintain or enhance water and air quality, support human and animal health and habitation. This is not limited to agriculture, though most work and evaluation has occurred on agricultural lands.

Soil health refers to the condition of the soil and its potential to sustain biological functions, maintain environmental quality and promote plant and animal health. Healthy soils are the key to food security and sustainable future. They support sustainable food production, mitigate and adapt to climate changes, filter water, enhance resilience to floods and droughts and so much more.

Soils play a vital role in the health of ecosystems in the world. Soils connect with air, water, rocks and organisms and are responsible for a multitude of functions in the global ecosystem services. These functions include providing habitat for most living things, air composition and quality, temperature regulation, carbon and nutrient cycling, water cycling and quality, and natural waste recycling. Mankind cannot survive without these soil functions.

30.1. Habitat

Soils are the environment in which plants grow. They provide heat, nutrients and water to nurture plants to maturity. These plants, together with other plants and organisms, create ecosystems. These plants then provide valuable habitat and food sources for animals, bacteria and other things. Ecosystems depend on the soil and soils determine the nature and kind of ecosystems.

Soil pollution indicates the presence in the soil of any chemical or substance out of place and/or present at an abnormally higher concentration so as to adversely affect any non-targeted organism. Soil pollution often cannot be visually perceived or directly assessed, thus rendering it a latent danger. The Status of the World’s Soil Resources Report identified soil pollution as one of the main soil threats affecting global soils and the ecosystems services provided by them. Concerns about soil pollution are growing in every region. Recently, the United Nations Environmental Assembly (UNEA-3) adopted a resolution calling for accelerated actions and collaboration to address and manage soil pollution. This consensus, achieved by more than 170 countries, is a clear sign of the global relevance of soil pollution and of the willingness of these countries to develop concrete solutions to address the causes and impacts of this major threat.

29.1. Sources of Soil Pollution

The main anthropogenic sources of soil pollution are the chemicals used in or produced as byproducts of industrial activities, domestic, livestock and municipal wastes (including wastewater), agrochemicals, and petroleum- derived products. These chemicals are released to the environment accidentally, for example from oil spills or leaching from landfills, or intentionally, as is the case with the use of fertilizers and pesticides, irrigation with untreated wastewater, or land application of sewage sludge. Soil pollution also results from atmospheric deposition from smelting, transportation, pesticide applications and combustion of many substances as well as radionuclide fallouts from atmospheric weapons testing and nuclear accidents. New concerns are being raised about emerging pollutants such as pharmaceuticals, endocrine disruptors, hormones and toxins, among others, and biological pollutants, such as micropollutants in soils, which include bacteria and viruses.

Although plants can be grown to maturity in aerated nutrient solutions and other media, virtually all land plants, including those on which we depend for food, fibre and fuel, grow in soil. The soil has three-fold function to perform with respect to crop growth: physical, chemical and biological.

To millions of different organisms around the world, soil is the habitat. A handful of soil can contain billions of soil micro-organisms. One gram of a fertile soil can harbour up to one billion bacteria. Only 5% of what is produced by green plants is consumed by animals, but 95% is consumed by microorganisms. Soil organisms are generally grouped into microfauna/microorganisms and macrofauna. The main soil microorganisms are bacteria, fungi, and protozoa. The macro-fauna includes oligochaeta, arthropods, mollusks and nematodes. These organisms play an essential role in soil formation and soil environment.

27.1. Bacteria

Bacteria are the major single-celled microorganisms in the soil ecosystem that are responsible for many important processes. There are many different types of bacteria and most of them are aerobic, requiring oxygen from the soil atmosphere. However, there are bacteria that live without oxygen and other types can live both with and without oxygen. The growth of these bacteria is limited by the food that is available in the soil. They decompose plant materials as well as other organisms’ wastes that contain plant nutrients in an unusable form and convert them into a form that can be used by plants. One such essential nutrient that is converted by bacteria is nitrogen. Nitrogen-fixing bacteria are able to use the nitrogen (N₂) that exists in the atmosphere and convert it through cellular processes into ammonia (NH₃). Nitrifying bacteria mix ammonia with water to create ammonium ion (NH₄+) and nitrate (NO₃^-), which can be used by other organisms.

The synthesis of humic substances is the least understood and the most intriguing aspect of humus chemistry. Studies on this subject are of enduring and continued research. Several pathways have been identified for the formation of humic substances during the decay of plant and animal remains in soil, the main ones being shown in Fig. 26.1.

The Carbon Cycle

The element that serves as a corner stone for cell structure is carbon. Plant tissues and microbial cells contain approximately 40 to 50% of C on dry weight basis. Yet, the ultimate source is the CO₂ of the atmosphere. The CO₂ is converted into organic C by the action of photoautotrophic organisms (higher plants and green algae). It has been estimated that the vegetation on earth’s surface consume some 1.3 x 10¹⁴ kg of CO₂ per annum which is about V₂₀ of the total CO₂ supply of the atmosphere or ¹/₁₀₀₀ of that in the ocean. Soil carbon constitutes the largest terrestrial pool of carbon.

Soil organic matter (SOM) is one of the most complex materials existing in nature. Besides the organic constituents in undecayed plant and animal tissues, SOM contains both living and dead microbial cells, microbially synthesized compounds and an unending array of derivatives of these materials produced as the result of microbial activity. Soil organic matter contains most of the naturally occurring organic compounds. Some components of SOM are undoubtedly unique to the soil environment, particularly those involving inorganic-organic complexes.

Electrical conductivity (EC) is the ability of a material to transmit electrical current. In the soil, the EC is the ability of the soil solution to carry an electrical current and is a measure of the total amount of soluble salts present in the soil. Pure water is a poor conductor of electricity and increases in soluble salts water result in proportional increases in the conductivity.

23.1. Sources of Soluble Salts in Soil

The soluble salts in soils consist mostly of the cations sodium, calcium, and magnesium and the anions chloride and sulfate. Constituents that ordinarily occur only in minor amounts are the cation potassium and the anions bicarbonate, carbonate, and nitrate. The original and, to some extent, the direct source of all the salt constituents are the primary minerals found in soils and in the exposed rocks of the earth’s crust.

While the mean chlorine and sulfur content of the earth’s crust is 0.05 and 0.06 percent, respectively, sodium, calcium, and magnesium each occur in the range of 2 or 3 percent. During the process of chemical weathering, which involves hydrolysis, hydration, solution, oxidation, and carbonation, these constituents are gradually released and made soluble. When carbon-di-oxide, of atmospheric or biological origin, dissolves in water, bicarbonate ions are formed. Water containing carbon-di-oxide is an active chemical weathering agent that releases appreciable quantities of the cation constituents as the bicarbonates. The concentrations of carbonate and bicarbonate ions are a function of the pH of the solution. Appreciable amounts of carbonate ions can be present only at pH values of 9.5 or higher.

Soil Reaction

Soil reaction is an indication of the acidity or basicity of the soil and is measured in pH units. The pH scale ranges from 0 to 14, with 7.0 as neutral point. From pH 7 to 0, soil is increasingly acidic. From pH 7 to 14, soil is increasingly alkaline.

Pure H₂O ionizes to a very small degree, though to a measurable extent, so that it has the following equilibrium: both H+ and OH^- are in concentrations of 10^-7 moles L^-1.