eChapters

Introduction

Seeds are regarded as carriers of new technology and serve as basic catalytic input for enhancing the agricultural production. Hence the timely availability of quality seeds of the right variety in adequate quantity decides the strength of an agricultural economy. The intensive crop improvement programmes have resulted in the development of large number of hybrids and high yielding varieties in many important crops. Today, the Indian seed industry is the fifth largest seed market in the world, accounting for 4.4 per cent of global seed market. In terms of global trade, India is almost self-sufficient in flower, fruits and vegetables and field crops seeds (Anonymous, 2015). Economy of crops depends on good crop variety. Farmers choose these verities based on good quality traits and satisfactory yield. Thus, it is always essential to do fidelity check of all plant variety. The genetic purity is one of the most important aspects of quality control. Seed quality includes good germination, purity, seed health and vigour. With the increase in seed industry, there has been a refinement in the techniques used for testing genetic purity or genuineness of seed purity. Methods for testing genetic purity include different morphological, chemical, biochemical and molecular markers. Under PPV & FR Act, DUS (distinctiveness, uniformity, stability) testing procedure is performed with morphological descriptors. However, in agriculture, biotechnology has found applications in checking of true to type of clones and variety identification programs using molecular and chemical markers. Markers that reveal polymorphisms at the protein level are known as biochemical markers, while DNA markers reveal polymorphisms at the DNA level.

Heterosis

The superiority of F₁ hybrid over both its parents in terms of yield or some other characters or heterosis is increased vigours, growth, yield or function of a hybrid over the parents, resulting from crossing of genetically diverse organisms. The term heterosis was first coined by Shull in 1914. Generally heterosis manifested as an increase in vigour, size, growth, yield or some other characteristics. But in some cases, hybrid may be inferior to the weaker parent this is also regarded as heterosis.

Introduction

Quality seed plays seminal role in augmenting agricultural production as well as productivity. Only by using good quality seeds, productivity can be enhanced up to the tune of 15-20 per cent alone, but under optimum management, the increment may touch upon up to 45 per cent depending upon the crops since the efficiency and efficacy of all other inputs in the production technology gamut are contingent upon the quality of seeds being used. Since antiquity the importance of quality seed to enhance agricultural productivity is well evident as mentioned in old testimonials, literatures, scriptures, treatises, epics, and many other ancient documents.

Seed quality is the major decisive factor governing stand establishment of any crop and thus having immense importance and bears utmost priority in case of high value, low volume crops like vegetables in particular and for high volume low value crops in general for enhanced productivity and production as well (Mandal et al., 2015). A number of diverse materials/ treatments at varying doses have been used to increase the rate and uniformity of seedling emergence in wheat and rice, which are generally categorized for seed enhancement, which is a kind of value addition.

Seed enhancement may be defined as post-harvest treatments that improve germination and seedling growth or facilitate the delivery of seeds and other inputs/materials required at the time of sowing smoothly. Seed enhancement technology predominantly possess a central objective to further improve seed performance by treating with specific additives/ chemical/ organics/ botanicals, etc. under very specific regimes and with the aid of certain planting equipments to grow uniform crop obviously to harness higher productivity and production (Halmer, 2006). Various techniques have been employed to assure superior performance of additives in different crops and most have been found to have immense commercial application (TeKrony, 2006). This includes three general areas of enhancement: pre sowing hydration treatment (priming), coating, pelleting technologies and seed conditioning.

Introduction

In India, around 70 per cent of cultivated land is under rainfed condition, but it accounts for about 42 per cent of the total quantity of produced food grains (Sujatha et al., 2013). It was estimated that using quality seeds, productivity can be enhanced up to the extent of 15-20 per cent and under optimum management, the increment may touch upon up to 45 per cent depending upon the crops. Quality seeds play a major role, along with improved package of practices leading to enhanced productivity. Crops propagated with seeds face many problems: Poor seed germination, poor seedling establishment under several abiotic stresses such as, drought, salinity and poor seedling vigour. The capacity of a crop propagated with seeds to grow depends on its genetic constituent and its interaction with the environmental biotic stresses. A number of diverse materials/ treatments at varying doses have been used to increase the rate and uniformity of seedling emergence in many field crops, which are generally categorized for seed enhancement. Seed enhancement may be defined as “post-harvest treatments that improve germination and seedling growth or facilitate the delivery of seeds and other inputs/materials required at the time of sowing smoothly”. Seed enhancement technology predominantly possess a central objective to further improve seed performance by treating with specific additives/chemical/organics/botanicals etc. under very specific regimes and with the aid of certain planting equipments to grow uniform crop obviously to harness higher productivity and production (Halmer, 2006). There are several ways and means to enhance vigour of germinating seedlings while emerging from the seed, which produce a uniform crop stand and finally substantially more yield is achieved by adopting simple techniques.

Introduction

Seed pathology has been recognized as its own specialization for a relatively brief time, and the term “Seed Pathology” was first coined by Mary Noble in the 1940 (Agarwal and Sinclair, 1997). Seed pathology is an essential part of seed technology as well as a sub discipline of plant pathology. According toAgarwal and Sinclair (1997), it may be defined as the study of seed borne disease and pathogens carried with seed. It also includes studies on the mechanisms of seed infection, seed transmission, the role of seed borne inoculum in disease development, methods for the detection of seed borne pathogens and non-pathogens, seed certification standards, mycotoxins and mycotoxicoses, and various methods for control of seed borne disease. Seed pathology includes the study of diseases and deterioration caused by bacteria, fungi, nematodes, viroids, viruses, physiological and mechanical disorders.

Neergaard Paul is considered the father of seed pathology. He was one of the founding father and later served as Director of the Danish Government Institute of Seed Pathology for Developing Countries, Copenhagen, Denmark, from 1956 to 1974. He served as the Chairman of the Plant Disease Committee of the International Seed testing Association (ISTA). During his tenure as Chair of ISTA, he helped standardize methods for the detection of seed borne fungi.Neergaard (1977) authored a two-volume text entitled “A Seed Pathology”. This text has served as a reference and teaching standard for the science of seed pathology throughout the world (Agarwal and Sinclair, 1997). This text focused on a wide variety of seed pathology issues, ranging from the economic significance of seed borne diseases to the assessment of seed borne inoculum.

Introduction

Stored-product insects are serious pests of dried, stored, durable agricultural commodities and of many value-added food products and non-food derivatives of agricultural products worldwide. Various estimates on post harvest losses across the country revealed that there is loss of 2–12 per cent during storage exclusively by insects. Almost all the insect species may destroy 10.0 -15.0 per cent of grain and contaminate the rest with undesirable odour. The major loss is done by two internal feeders i.e. rice weevil and grain borer, which are major pests of rice, wheat and millets (Champ and Dyte, 1977). They also help in transportation of fungi (Sinha and Sinha, 1990). The losses during storage are quantity losses and quality losses. Quantity losses occur when insects, rodents, mites, birds and microorganisms, consume the grain. Infestation causes reduction in seed germination, increase in moisture, free fatty acid levels and decrease in pH and protein contents etc. resulting in total quality loss. Quality losses affect the economic value of the food grains fetching low prices to farmers (Das et al., 2013).

Introduction

Seed is a critical and vital input that draws an explicit line between the success and failure of any agricultural production programme. In fact progressive history of agriculture has been a history of seed development and production. The mankind has been attempting to select better seed and employ better seed production techniques volitionally or in-volitionally ever since it divested nomadic life for the settled one. Initial attempts were confined to selection of useful crops followed by selection of better sorts and land races among the available native genetic resources. The introductions, hybridization followed by selection of better types and modern breeding tools inclusive biotechnological interventions have been extensively employed to breed better seed. Considering that research in crop improvement can turn little stone unless the quality seed with desired attributes is made available to the farmers. Government of India set up enforcement of provisions of Seed Act, 1966 for certification of seed as per prescribed minimum standards. Central Seed Certification Board was established in 1972 to exhort the central and state governments for producing genetically and physically pure and physiologically viable seed. The seed production programmes and rules were progressively honed to meet the ground situations. Initially the seed was considered as the exclusive bastion of public sector but the private sector got actively involved in seed production. WTO the seed still became a very open subject and the Seed Act was modified in 1988 and 2001 to permit import and export of quality seed, respectively. Despite of all these positive developments in seed sector, the availability of seed is still far from satisfactory. As on today private sector dabbles in low volume high cost seed due to economics and storage factors but the high volume less cost is still a virgin for private sector and is predominantly done by the public sector. Crop improvement is no more an art and science of improving hereditary of crop plants but has become a starker and competitive business under which the stronger would survive and the weaker get eliminated.

Business was abysmally shattered at the terminal end of the Second World War. This forced some nations to sign some tariff related global

Introduction

In order to implement the sui generis system for plant variety protection for granting PBR to a breeder or farmer or institution, DUS testing is compulsory. A new variety shall be registered, if it conforms to the criteria of novelty, distinctness, uniformity and stability. An extant variety, a variety about which there is a common knowledge shall also be registered within a specified period, if it conform such criteria as distinctness, uniformity and stability.

Once a valid application for PBR is accepted the seed / plant material of the variety will be requested for official DUS tests. These official DUS tests need to be conducted by crop based institutions on behalf of the PPV & FR authority by following universally acceptable test procedures. This necessitated in the development of test guidelines, descriptors and procedures to be followed in each crop. National Test Guidelines have been developed for 96 crops representing harmonized approach for the testing of new varieties which will form the basis for DUS examination. These National Test Guidelines contain details on i) subject of the guidelines, ii) material required, iii) conduct of tests, iv) methods and observations, v) grouping of varieties, vi) characteristics and symbols, vii) table of characteristics, viii) explanations on table of characteristics, ix) literature and x) technical questionnaire. The registration was open for 107 crop species for new variety and for 114 crop species for extant / farmers varieties.

Introduction

Development of improved crop varieties is vital for sustained increase in agriculture production and productivity. Timely supply of quality seed is equally significant since the contribution of quality seed alone is estimated to be 15-20 per cent to total crop production. Seed quality attains more significance in view of emerging biotic and abiotic stresses, issues related to quality and phytosanitary measures, competition in domestic and international markets and emerging food needs. Measures of seed legislation with respect to quantity and quality were initiated in the country by establishment of National Seed Corporation during 1963 under Ministry of Agriculture. The seed sector in India during the period was dominated by the Public sector. The National Seed Corporation was the Central Body to produce seeds of superior dwarf varieties in rice, wheat, and superior hybrids in maize, pearl millet and sorghum. This was followed by various seed legislations enacted by Government of India. Further, AICRP-NSP (Crops), popularly known as National Seed Project was launched during 1979-80. The NSP-Project came into operation in three major phases and continues to produce breeder seed to cater the needs of the Indian farmers. The project resulted in achieving breeder seed production surpassing the indents in all major crops. The seed programme of the country was further strengthened with NSP II (World Bank) Project starting in 1989-90, which not only supported the ICAR and SAUs, but also Department of Agriculture, Seeds Corporations, Seed Certification Agencies and Private Seed Industries to a great extent in production, processing and in providing quality seeds to the country.

Organic agriculture or farming is very much native to India. Whosoever tries to write a history of organic farming will have to refer India and China. The farmers of these two countries are farmers of 40 centuries and it is organic farming that sustained them. This concept of organic farming is based on following principles:

• Nature is the best role model for farming, since it does not use any inputs nor demand unreasonable quantities of water.
• The entire system is based on intimate understanding of nature’s ways. The system does not believe in mining of the soil of its nutrients and do not degrade it in any way for today’s needs.
• The soil in this system is a living entity.
• The soil’s living population of microbes and other organisms are significant contributors to its fertility on a sustained basis and must be protected and nurtured at all cost.
• The total environment of the soil, from soil structure to soil cover is more important.

Introduction

Organic seeds are produced by purchasing conventional non-treated seeds and growing them on organic plot / farm for one season without the use of any synthetic chemical. The seeds harvested are then sold on to organic farmers as organic seeds.

Over 98% of sprayed insecticides and 95% of herbicides reach a destination other than their target species, because they are sprayed or spread across entire agricultural fields. Runoff can carry pesticides into aquatic environments while wind can carry them to other fields, grazing areas, human settlements and undeveloped areas, potentially affecting other species. Other problems emerge from poor production, transport and storage practices.

Production of organic seeds without the use of pesticides like herbicides (weeds), insecticides (insects), fungicides (fungi), nematocides (nematodes), and rodenticides (vertebrate poisons) is a matter of skill and expertise. For this purpose, the seeds used for planting, the soil where they are planted, the water used for irrigation and even the air, need to be kept free of pesticides in order to prevent their contamination.

Seed

Introduction

Germination is the process by which a plant grows from a seed or similar structure. The most common example of germination is the sprouting of a seedling from a seed of an angiosperm or gymnosperm. Quick germination is the various ways and means that really fastened the process of seed germination. Through various ways, it is possible to reduce the time of germination by 70 per cent and also the success rate of germination can also be doubled.

Archaeobotany

Botany as far as it is relevant in archaeology mainly denotes all types of ancient organic material (in particular ancient plant remains) collected from excavation sites. The deliberate study of the interrelationship between humans and plants and the environmental context in which this occurred has been called archaeobotany.

Introduction

Since beginning of this century genetic diversity of agricultural crop has been lost due to several reasons (Marla, 2012). Genetic erosion is caused by human intervention, mono culture, green revolution especially due to commercialization of plant breeding. So there is urgent need to collect, conserve plant genetic & genomic resource for further use.

A seed bank stores seeds to preserve genetic diversity. There are many reasons to store seeds. One reason is to have on-hand the genes that plant breeders need to increase yield, disease resistance, drought tolerance, nutritional quality, etc. of plants used in agriculture (i.e., crops or domesticated species). Another reason is to forestall loss of genetic diversity in rare or imperiled plant species in an effort to conserve biodiversity ex situ and in situ. Many plants that were used centuries ago by humans are used less frequently now and seed banks offer a way to preserve that historical and cultural value. Collections of seeds stored at constant low temperature and moisture guard against loss of genetic resources that are otherwise maintained in situ or in field collections. These alternative ‘living’ collections can be damaged by natural disasters, outbreaks of disease or war. Seed banks are considered seed libraries and contain valuable information about evolved strategies to combat plant stress or produce novel products. The work of seed banks spans decades and even centuries. Most seed banks are publicly funded and seeds are usually available for research that benefits the public.

Introduction

Synthetic seeds are defined as artificially encapsulated somatic embryos, shoot buds, cell aggregates, or any other tissue that can be used for sowing as a seed and that possess the ability to convert into a plant under in vitro or ex vitro conditions and retained its potentiality also after storage (Capuano et al., 1998). In other words, synthetic or artificial seeds defined as somatic embryos engineered seed used in the commercial propagation of plants (Gray and Purohit, 1991; Redenbaugh, 1993).

Artificial seeds have great potential for large scale production of plants at low cost as an alternative to true seeds (Roy and Mandal, 2008). An artificial seed is often described as a novel analogue to true seed consisting of a somatic embryo surrounded by an artificial coat which is at most equivalent to an immature zygotic embryo, possibly at post-heart stage or early cotyledonary stage (Bekheet, 2006). There are various advantages of artificial seeds such as better and clonal plants could be propagated similar to seeds, preservation of rare plant species extending biodiversity could be realized, and more consistent and synchronized harvesting of important agricultural crops would become a reality, among many other possibilities (Khor and Loh, 2005). In addition, ease of handling, potential long-term storage and low cost of production and subsequent propagation are other benefits (Bekheet, 2006).

Introduction

Seed as an input is the precursor for agricultural development as it alone can guarantee 20-30 per cent share of crop productivity (Koudinya and Kumar, 2014). Rigveda, the world’s most ancient scripture available, prescribes the importance of seeds as “Subeejam Sukshetre Jayate Sampadyate” which literally means, “A good seed in a good field can lead to the prosperity and posterity of the entire human race”. Seed production is indeed important to take care of a country’s food and nutritional security needs. At the same time, seed export across countries is vital for ensuring competitiveness in the domestic seed industry besides generating employment and valuable foreign exchange which in turn can be used for scaling up the seed sector’s efficiency itself (Poonia, 2013). As a matter of fact, seed trade is one of the reasons for huge advances made in the Indian seed industry through development and exchange of genetic transformation, marker-assisted breeding and nanotechnology (Nandi et al., 2013). As of 2014-15, global seed industry has reached USD 45 billion in which international seed export alone was worth USD 10 billion. Further, with the estimated growth rate of 9.2 per cent during 2015-2020, the world seed business is expected to be over USD 92 billion. Presently, USA, China, France, Netherlands and Brazil are the top markets comprising more than 66 per cent of the global share in seed trade. Corn, soybean and vegetables account for more than 75 per cent of the total global seed market volume. As of 2014-15, the value of the Asian vegetable seed market was USD 6.75 billion in which China had a major share (41 per cent) and the Indian share was around 7 per cent. Moreover, the world vegetable seed market alone is expected to grow at the rate of 7 -8 per cent per annum and reach USD 8.8 billion by the year 2020 (Parashar and Kumar, 2016).

A

Abnormal seedling: Abnormal seedlings are those seedlings which do not show the capacity for continued development in to normal plants when grown in good quality soil under favourable conditions of water supply, temperature and light.

Abortion: Loss of reproductive structures (e.g. a flower or an ovule) during development or arrest of development of any organ so that it remains imperfect or fails to reach maturity.

Absolute humidity: The amount of water vapour present in a given volume of atmosphere, usually expressed in g water per kg dry air, or g water per cubic meter air.

An overwhelming proportion of plant material used for compounding herbal medicines and nutraceuticals is currently collected from the wild. With traditional health care systems gaining increasing popularity, the enormous amount of plant material extracted from the limited plant populations available in natural stands is a cause of justifiable alarm. The unscrupulous plunder of plant populations growing in the wild is pushing increasing number of important species to the endangered category and many to the verge of extinction. Also, unethical practices like adulteration and storage of medicinal plants under unacceptable conditions are rampant. All this is happening, when the consumer is becoming increasingly quality conscious and is demanding traceability of source material used for formulations and adherence to good practices for the entire chain of manufacturing process for herbal drugs and plant-based nutraceuticals. Clearly, solution to this problem lies in replacing the ‘collection from the wild ’ paradigm to ‘production by cultivation ’. An essential prerequisite for meeting this objective is a well thought out research agenda which not only tackles productivity enhancement goals for the targeted plant species but also addresses the validity of the entrenched notion among healers who use the traditional medical systems, that only material collected from the wild produces the desired results. The reason advanced in support of this argument is that phytomedicines are derived from plant populations growing in the wild under organic conditions and under their natural rhizosphere and rhizoplane. The associated soil-microbial complexes, and a variety of endophytic microorganisms, may be the initiators or modifiers of the production and expression of medicinal properties.

It also so happens that a majority of medicinal plants are shade loving, C4 types and will necessarily require their species-specific ambient environment for elicitation of the medicinally relevant moities.

Introduction

Pulses are pivotal and integral component of Indian agriculture and are excellent crops for natural resources management, environment security, crop diversification consequently for viable agriculture. India contributes 25 percent of the global production but has to import pulses to the home to the tune of 3.5mt every year to meet domestic requirement. In spite of largest area for chickpea, pigeon pea, lentil, dry beans & total pulses in the world, India’s’position in average productivity has never been decent i.e.25^th rank in chickpea, 19^th in Pea & 98^th in total pulses. This indicates that except chick pea & pigeon pea, the average productivity of the country is significantly lower than average yield of the world. To make India self sufficient in pulse production, the productivity level has to increase more than1200 kg/ha. by 2020. This gigantic task needs rigorous development & promotional efforts to transfer agro-technology packages in crop improvement and crop management, which are capable of doubling the present level of productivity Nanda et al. (1999) and Nanda

Technologiocal intervention is essential for improving pulse productivity through introduction of suitable high yielding varieties (Masood Ali and Shiv Kumar 2009). This is only possible through: (i) development of high yielding varieties with multiple resistance/tolerance to major diseases like mung bean yellow mosaic virus (MYMV), powdery mildew (PM) and Cercospora in mung bean and urdbean; (ii) development of varieties having resistance and tolerance to pre-harvest sprouting in mung bean, (iii) development of efficient plant type with high biomass and harvest index, (iv) development of varieties suited for intercropping system, (v) broadening genetic base of developed varieties, (vi) development of 50-55 days varieties of mung bean having 1 tonne/ha productivity and resistance to YMV for summer cultivation, (vii) development of high yielding and early maturity varieties of peas having resistance to powdery mildew, (viii) developing rajmash genotypes resistant to bean common mosaic virus and sclerotia rot, tolerant to high/low temperature and shattering resistance are important ones for increasing production through varieties intervention (AICRP MuLLaRP, http://iipr.res.in/mullarp).

In the post-green revolution period, the incessant rice-rice/wheat crop rotation has undoubtedly made the country surplus in cereal production but has marginalized pulses. This has raised serious concern about sustainability of the production system. Recognizing the importance of pulses for meeting dietary requirements of vast vegetarian population on one hand and their role in improving soil health and conserving natural resources on the other, the efforts were made to develop high yielding, short duration and disease resistant varieties of different pulse crops which can help in diversification and intensification of popular cropping systems. As a result, several new cropping systems have been designed, developed and advocated for rainfed and irrigated areas.

Pulses are legumes whose grains are consumed as dal. Thus all legumes are not pulses, but all pulses are legumes. Legumes are characterized by presence of nodules in the root systems and papilionaceous form of flowers. Pigeon pea [Cajanus cajan (L.) Millisp.], green gram [Vigna radiata (L.) Wilczec.], black gram [Vigna mungo (L.) Hepper], cowpea [Vigna unguiculata (L.) Walp.], horse gram[Macroyloma uniflorum [(Lam.) Verd.] and moth bean[Vigna acontilifolia (jacq.) Marechal] are the important kharif pulse crops grown in different parts of India. The common rabi pulses are chickpea(Cicer arietinum L.), lentil (Lens culinaris Medik.), pea (Pisum sativum L.), lathyrus (Lathyrus sativus L.) and frenchbean ( Phaseolus vulgaris ). All these have C₃ photosynthetic cycle. All form root nodules in association with symbiotic bacterium Rhizobium. Increase in concentration of green house gases, particularly carbon di-oxide, has led to global warming and climate change. The extreme weather events such as drought, excess moisture, untimely rain, cyclone, excess heat and hailstorm have become common. Crops respond differently to increase in CO₂ concentration. Both abiotic and biotic stresses due to global warming are likely to reduce productivity of pulses/pulse based cropping systems through adverse effects on crop growth and development. Birthalet al. (2014) reported higher decrease in grain yield of pulses(pigeonpea and chickpea) as compared to cereals (rice and wheat) due to rise in the minimum and the maximum temperature.

Pulses are known for their soil fertility restoration value. Deep rooting, nitrogen fixation, leaf shedding ability and mobilization of insoluble soil nutrients are some of the unique characteristics of pulses. By improving chemical, biological and physical environment in the soil, pulses can arrest the declining trend in productivity of cereal-cereal system. Inclusion of pulses in intensive cereal based system itself is a component of integrated plant nutrient supply system. Therefore, pulses have become viable alternative to improve the soil health and conserve the natural resources and agricultural sustainability. Pulses in the cereal/oilseed based cropping systems are introduced to break the monotony of crop rotation. Pulses being rainfed low input crop provide safeguard against crop failure due to scanty rainfall and adverse weather conditions. Apart from enriching soil fertility, introduction of pulses in cropping system also improves nitrogen economy. Early pigeonpea-wheat sequence was evaluated and found promising than traditional rice-wheat cropping system in irrigated areas of Punjab, Haryana, central and western Uttar Pradesh.

Pulses are important ingredients of human diet and principal source of protein of high biological value particularly for vegetarians. These are excellent feed for animals endowed with an unique ability of biological nitrogen fixation, carbon sequestration, soil amelioration, capable to sustain under harsh climate and an integral component of sustainable crop production system. It is expected that by the year 2050 world human population will climb to 9.7 billion, India 1.6 billion and that of Odisha will be more than 5.75 crores. It will be a great challenge by agricultural scientists for assured food security of billions of hungry human mouth with nourishing food especially pulses, oilseeds and other dietary ingredients. Current production of pulses are not sufficient to meet the requirement. In Odisha it is expected to have a shortage of 1.7 lakh tones of pulses towards 2030 if the current rate of production will not increase. The fact is almost similar for nation although India contributes 24 per cent of global pulse production but imports about 2.0 million tones every year. The deficit will further mount as the per capita consumption on dal of an Indian is increasing. It necessitates to increase pulse production which is not happening keeping pace with need (Jena et al., 2015).

1. Introduction

Conservation agriculture (CA) strategies and practices have been developed and promoted to reduce risk and improve natural resource conditions, as well as address the combination of low yields, production risks and poor natural resource conditions. According to the United Nations Food and Agriculture Organization (FAO), CA is an approach to managing agro-ecosystems for improved and sustained productivity, increased profits and food security while preserving and enhancing the resource base and the environment. It is based on enhancing natural biological and ecological processes above and below ground. Interventions such as mechanical soil tillage are reduced to an absolute minimum, and the use of external inputs such as agrochemicals and nutrients of mineral or organic origin are applied at an optimum level and in a way and quantity that does not interfere with or disrupt biological processes (FAO, 2008). 

Pulses can be grouped into kharif and rabi pulses according to their temperature requirements. In India chick pea, pea, lentil and beans require relatively less temperature and are grown in rabi season, whereas others are confined to kharif season. However, kharif pulses can also be grown in pre-rabi on stored soil moisture or as irrigated crops in rabi and summer seasons.

Pulse crops have long tap root system which extracts soil moisture from deeper layers. Water uptake across the depth of rooting zone is not uniform. In general 40 per cent of the total water uptake occurs from first one fourth of the rooting zone, 30 per cent from the second, 20 per cent from the third and remaining 10 per cent from the last one-fourth region of total rooting depth (Nageshwararao and Writ, 1994). Plants often maintain higher root length densities than required in the surface layers to facilitate rapid uptake of recent rain/irrigation before it evaporates.

Pulses are gaining more important position in Indian agriculture. After green revolution, India became self sufficient in case of food grain production. However, India is still lagging behind in case of pulses production and is dependent on imports for the domestic consumption in present days. As there is little scope to increase area under pulse, the production can be increased by enhancing the productivity by various agro techniques. Among various factors which limit the pulse production and productivity, poor weed management at the early stages of crop growth, is one of them( Dash et al., 2003 and Dash & Mishra, 2014). Yield loss due to weed have been enumerated by different workers at different places to the tune of 20-65 per cent depending upon the crop growth stages, weed intensities and environment conditions. There are many methods available to control the weed menace at different crop growth stages but the integrated weed management (IWM) is considered to be a more practical and effective approach in the long run since combination of methods will take care of weeds in totality and prevents seed production of weeds and enrichment of soil seed bank (Das, 2008). IWM also provides continuous control of weeds over the crop growth stages than a single method in isolation. Hence application of suitable organic herbicide supplemented with one/two manual weeding are being advocated to control the weeds. Other weeding practices like hoeing, inter- cultivation, mowing, earthing up, weeding by mechanical weeder etc. may be substituted or supplemented to the manual weeding. IWM also reduces the modern day weed problems like weed shift, herbicide resistance, and preponderance of perennial and parasitic weed problems. Under high cropping intensity adoption of IWM practices always generate higher income and maximum profit to the growers.

Pulse crops have a unique position in sustainable crop production as they provide proteinaceous food of high nutritive value and keep the soil alive and productive. India is the largest producer and consumer of pulses in the world which accounts for 32 per cent of global area and 28 per cent of world’s pulse production. But the yield levels of these pulse crops are not satisfactory as it is grown as a neglected crop. Besides, extensive damage caused by insect pests is another major constraint for low yield of pulse crops. On an average annually 2.5 to 3.0 million tonnes of pulses are lost (Rabindra et al., 2004) with a monetary value of nearly Rs.6,000 crores due to ravages of insect pest complex (Reddy, 2009 and Panda et al. 1998). About 250 insects have been recorded feeding on these pulse crops in different parts of India (Narang, 1990) of which maximum damage is caused by the pod borer complex along with some sucking pests and foliage feeders. Sap feeders viz., aphids, whitefly, leaf hopper, thrips ; defoliator viz., leaf roller, hairy caterpillars etc are major threats to the crop during vegetative stage whereas the pod borers and pod sucking bugs are of major concern during reproductive stage. About two dozen insect pests are very important and found occurring on one or the other pulse crop frequently causing variable degrees of damage. A list of the very common insect and mite pests infesting different pulse crops (Table 1) and the extent of loss caused by different insect pests to some important pulse crops documented by the IIPR, Kanpur (Table 2) are furnished below.

In Indian Agriculture pulses play an important role in maintaining soil fertility and supplying protein to the vegetarian population of the country. This is because they are endowed with unique property of fixing atmospheric nitrogen in their root nodules and improving soil physical property. Further, it is not only the high protein content of pulses for which they are important, but the amino acid profile of these proteins is such that the mixed diet of cereals and pulses has superior biological value than either of the components alone.

Seed is the basic input in agriculture that acts as a catalyst for realising the full production potential of the high yielding/improved varieties. The role of quality seed in agriculture has been recognized since the ancient periods. It is a well established fact that among all the agricultural inputs, use of quality seed alone can enhance the crop production up to 15-20 per cent, depending upon the crop, and it can be further raised up to 45 per cent with efficient management of other inputs. If the seed sown is of inferior quality, the efforts of the plant breeders in developing and introducing improved varieties would be rendered futile. Modern agriculture lays great emphasis that each and every seed should germinate readily with full potential and produce vigorous seedlings to ensure high yields.

The role of mechanization has of late earned considerable significance in Indian agrarian sector following the unprecedented hike in labour cost, migration of agricultural labour to the urban localities for better remuneration and most importantly, the rising concern of rural youth today for more comfort as well as social dignity and status. Furthermore, mechanization has been extremely supportive to enhance the efficacy of the vital inputs to agriculture such as high yielding seeds, fertilizer, water, pesticides etc resulting in higher production and productivity. One more significant contribution of mechanization is timely completion of various operations with qualitative and quantitative competence apart from reduction in drudgery; thus motivates the farmer to dare for higher initial investments in anticipation of rich dividends over a period of time.

Pulses are one of the highly consumed eatables due to their palatability and nutritious quality. They are essential components of food as sources of protein to vast vegetarian population. Being a cheap source of proteins, pulses also play an important role in nutritional security of the nation. Pulses also provide green pods for vegetables and nutritious fodder for cattle because of their rich essential amino acid lysine content. Dry pulses are converted to dal and used by majority of people. Since majority of Indians are vegetarians, they depend largely on grain legumes (pulses) for their dietary protein.

The stages through which the commodity passes from harvest till we consume that are considered as post harvest stages. Post harvest management is an important component of agriculture and is the key to make more food and nutrition available to people. This is very important when it is estimated that almost about 10% of the food grains are lost every year in a country like India due to improper post harvest management and lack of value addition (Pal and Dash, 2012).

Yield gap of a crop is the difference between the maximum yield under optimum management condition and the average yield achieved by the farmers. Yield under optimum management condition is otherwise known as potential yield of the crop. Because of concerns about global food security problem of malnutrition, there is necessary to minimize the yield gaps in order to enhance food production within limited resources. This will reduce vast majority of undernourished population residing in under-developed countries. Assessment of potential yield and the gap between potential and actual yield is very much necessary before any investment for improving crop production (Nanda and Sahoo 2010).

Gender relates to socially assigned roles and responsibilities attributable to men and women. Gender roles are played by both women and men, which are not determined by biological factors, but by the socio-economic and cultural environment or situation (Mollel and Mtenga, 2000).

Women from poor households engage in a variety of income earning activities. In some cases, these activities supplement the contribution by males, while in others they are the primary or the sole source of household livelihoods (Kabeer 2003). Women are twice as likely as men to be involved in agricultural activities (Odame et al., 2002). According to Fernando (1998), activities, resources and opportunities of people are significantly influenced by gender that is, by the socio-economic and cultural dimension of being male or female. Moreover, different types of activities are generally allocated to women and men within the family with a view for subsistence production and marketable production. In most of the societies, tasks related to child bearing and care and maintenance of the household (cooking, fetching water and firewood) are assigned to women.

Pulse production is an integral part of food production, which helps in ensuring nutritional security by way of providing plant protein in human diet. In spite of several efforts, lots of people in third world countries suffer from nutritional deficiencies due to lack of balance diet. The women folk are the most sufferers, who are deprived of taking adequate quantity of protein rich food that helps in growth and development of human body.

Agriculture – world-wide – is a vital determinant of the livelihoods of the rural communities and small holders in particular. Farm households consume as well as produce the food items. Diet diversity increased with farm size. Large farm- households obtain their food energy from more diverse sources – intake of pulses, milk, edible oil and sugar. Calorie intake per person per day decreased as farm size decreases. So also the protein intake on large farm house holds is substantially higher than for sub-marginal farm households and correspondingly for fats. So far the protein consumption is concerned the main source is pulses the small holder farmers grow. This is justified by the Simpson Index of diet diversity-0.43 for sub-marginal and 0.56 for large households (Singh et al., 2002). The production of pulses including the traditional/potential pulses keep priority for combating the protein deficiency in addition to earning monetary returns from export of processed and value added pulse products. The pulse production is not sufficient to cater the domestic consumption need. The area under pulse is declining over the years. The productivity is not satisfactory in comparison to the potential yield of the varieties as well as the low yield from traditional plant types grown mostly under rain fed and residual soil moisture condition after harvest of paddy or as pyra crop in paddy without proper crop management. The trend in total factor productivity of black gram and green gram, the major pulses is declining in state of Odisha and that of chick pea in Madhya Pradesh. The deficit in pulse production has led to rise in price of processed pulses due to its import to meet the domestic requirement.

Introduction

Geostatistics is a branch of statistics that deals with the analysis and modelling of geo-referenced data. Its main aims are to quantify spatial variability and to create maps from point observations. Of course there is much more to geostatistics than just that and indeed some of the other uses of geostatistics are addressed in this chapter too, but the emphasis is on the assessment of spatial variability and geostatistical interpolation.

The first step of geostatistical interpolation is to quantify the spatial correlation structure of the variable of interest. This can be done by examining the observations and how these vary in space. Next spatial interpolation makes use of the quantified spatial correlation to derive optimal predictions at unobserved locations and create a map. The interpolation error is quantified as well, which helps to design optimal spatial sampling schemes that balance data collection costs and map accuracy. All this will be explained in this chapter, but in order to do so we first need to explain the statistical theory that underlies geostatistical interpolation followed by representation of the spatial correlation structure, the basics of geostatistical interpolation (‘kriging’), kriging extensions and spatial stochastic simulation.

Introduction

A complex spatial soil properties pattern is directly controlled by soil internal factors and anthropogenic impacts.Hartemink et al. (2001) elaborate a strong decline in mineralogy, morphology and genesis of soil research than strong increase in pedometrics applications during 1967 to 2001. Hartemink and McBratney (2008) identified this change as “soil science renaissance”. Basically, the soil science deeply rooted in agriculture, geology, and chemistry but the paradigm has been shifted from classification and inventorization to quantification of soil patterns in spatial as well as temporal patterns and their impact on the ecosystem health and hydrological cycle. The environmental keen approach explains that soil is in the center of the ecosystem and highly interacting with the biotic and abiotic factors of the ecosystem and a complex pattern and process has been co-evolved with the time.

The arid region in India is spread over in 38.7 million hectare land. Out of the total 31.7 m hectare lies in hot arid region and remaining 7 m hectare comes under cold arid region. The hot arid region occupies major part of northwestern India (28.7 m ha) and a small pocket (3.13 mha) in southern India. The north western arid region occurs between 22°30’ and 32°05’ N latitude and 68°05’ to 75°45’ E, covering western part of Rajasthan, north western Gujarat and south western parts of Haryana and Punjab. About 62% area of arid region falls in western Rajasthan and 20% in Gujarat. Haryana and Punjab together constitute 7% area of arid region. The state wise distribution of arid region is shown in Table 3.1. Further our discussion is based on the majority area of arid region, belonging to Rajasthan, Gujarat, Punjab and Haryana.

Soil sampling is an integral and essential component of soil fertility evaluation and nutrient management research. The effectiveness of soil sampling is a prerequisite for soil testing to achieve its goals for efficient nutrient management and plant nutrition for improved yield and quality. The underlying basis for soil sampling is that a soil sample taken represents the “population” which may be a plot, field or a watershed. It further implies that nutrient status of the representative soil sample(s) determined in a laboratory would reflect nutrient status of a plot, field or watershed and is of interest for correcting nutrient disorders in the field or watershed.

The most important factor that influences the effectiveness of soil sampling is soil heterogeneity. However, in a relatively homogenous group of fields or plots, a small number of samples may be sufficient to represent the population to a more heterogenous group of fields that would require more number of samples to represent the soil population. Whenever, soil samples to be taken in field following points needs to be kept in mind.

Introduction

R is one of the most popular platforms for data analysis and visualization currently available. It is free, open-source software, with versions for Windows, Mac OS X, and Linux operating systems. R is a language and environment for statistical computing and graphics, similar to the S language originally developed at Bell Labs. It’s an open source solution to data analysis that’s supported by a large and active worldwide research community. But there are many popular statistical and graphing packages available e.g. Microsoft Excel, SAS, IBM SPSS, Stata, and Minitab etc., however R has many interesting features so why it is mostly followed by researchers and academicians. Few of the major features of R are given below: