eChapters

2.1 Simple Random Sampling
The simplest and common most method of sampling is simple random sampling. In this procedure, the sample is drawn unit by unit with equal probability of selection for each unit at each draw. It is sometimes referred to as unrestricted random sampling.

13.1 Introduction
In the previous chapters, we have considered different tests of significance based on normal distribution, F distribution, student’s t distribution and Chi-square (χ2) distribution which are frequently applied by the users of different disciplines of applied sciences and social sciences. In this chapter some more tests of significance are considered which have not been covered in those chapters. These tests are also based on t, F, Fisher’s z transformation, χ2 and some other test statistics are also discussed one by one in the following sections.

15.1 Introduction

The laws governing the flow of water in wells are referred to as the hydraulics of wells. Just like surface water flows from a higher elevation to a lower elevation by gravity, groundwater also flows from a region of higher water table to a region of lower water table. This difference of water table measured by any two piezometers divided by the longitudinal distance between them is called as hydraulic gradient. Hydraulic gradient plays a dominant role in deciding the flow of groundwater. This hydraulic gradient together with the hydraulic conductivity of the aquifer material forms the main law of well hydraulics called as Darcy’s law. An understanding of Darcy’s law together with some other laws as discussed subsequently in this chapter is essential in order to know the discharge of a well in a particular formation. Darcy’s law is valid for studying groundwater flow in alluvial formations. However, it is not valid for aquifers having hard rock areas.

Forage harvesting is more complex as compared to grain crops. Forage crop is of great bulk and mass, containing 70-80% water when first harvested. For storage it must be dried, either naturally or artificially, to a safe moisture content of about 20 to 25%. Due to low product value it limits the economic feasibility of mechanization of harvesting operation. The mowers are used to cut the crop and windrow in the field, which is manually collected for further chopping. The forage harvester consists of a combination of plant-cutting unit and a chopping unit and is called field forage harvester. The field forage harvester performs the functions of both row binder and silage cutter, as it severs the standing stalks from the ground and chops them into silage in one continuous operation in the field. It can be grouped into two according to the mechanism used to cut the crop viz. field choppers and flail harvesters.

Introduction

Vegetables contain large quantities of minerals, vitamins and essentials amino acids required for normal functioning of human metabolic processes and plays an important role in food and nutritional security. India is the second largest vegetables producing countries next to China and occupies 7.981 million ha area with an annual production of 129.077 million tons (Anonymous, 2009). Due to expanding urbanization and deforestation, most of the natural resources are depleting and shrinking with a rapid pace. With the limited land and depleting water resources, India has to feed the burgeoning population without destroying the ecological balances. In this context, we must have to look after the vertical expansion through increase in the intensity, diversification, mixed and intercropping of vegetable crops. Besides this, vegetables are also more prone to insect pests and diseases mainly due to their tenderness and softness as compared to other crops.

Introduction

Technologies and tools that have developed in the recent information technology revolution can play a very vital role in overcoming most of the present problems related to agriculture and rural development. In order to achieve the goal of an economically sound and stable society through environmentally friendly systems of agricultural production, it is imperative to have a comprehensive data storage system. This will not only help in providing systematic and periodic information to the planners, decision-makers and developmental agencies, but also help to manage our limited natural resources efficiently. The development of a data warehouse is one of the recent tools in the field of information technology that can fulfill the demands of the information that is required in the field of agriculture research, management and education

Fabrication: The act of building or putting together. Forming into a whole by uniting or assembling of parts.

Face lathe: A short-bed, deep gap lathe designed for the machining of large, flat surfaces.

Face milling: Milling flat surfaces perpendicular to the rotational axis of the cutting tool.

Faceplate or face chuck: A circular plate for attachment to the spindle in the headstock of a lathe. Work may be clamped or bolted to it. The slots engage the tail of the lathe dog.

Factor of safety: The number, which results by dividing the ultimate strength of a material by the actual stress on a sectional area.

Factor of stress intensity: The ratio of the maximum stress to which a structural member can be subjected to the maximum stress of safety.

Statistics involves procedures for collection, classification, analysis, interpretation and presentation of numerical data (Gupta, 1997). Statistical investigations involves four stages ie. collection of data, compilation of data, analysis of data and drawing inferences. For any statistical analysis, first step is data collection which constitutes the foundation for statistical analysis. The required data may be obtained either through survey or an experiment. Survey is the process of collecting data from a population but have no control over the factors which may affect the population characteristics under study, whereas in experiment, data is collected while control is exercised over the factors which may affect the population characteristics under study. Experiments always and almost provide better information than the survey but surveys are necessary in natural populations. When data is not available, it is collected by any of the two methods i.e. census or survey method. In census method, data are collected for each and every unit of the population whereas in sample method a representative sample is drawn from the population on the basis of which all the conclusions are drawn about the population from that sample.

Abstract

Vegetable crops are inherently rich sources of various health-promoting nutrients and thus they play an important role in balancing our daily diet. Being excellent source of vitamins and minerals, vegetables have a relatively variable nutrient content per unit of energy. These nutrients can be increased by proper selection of vegetables in our diet. Whereas their intrinsic quality maintains human health, the extrinsic quality has significance in determining acceptability by the consumer. Vegetables also have medicinal properties. These diversified and highly nutritive crops are of great importance in alleviating hunger and malnutrition. The present production of vegetable crops is, however, not enough to meet per capita daily dietary requirement as per dietitians’ recommendations. The vegetable production, therefore, need to be almost doubled by 2025 to meet requirement of ever increasing population from diminishing land, water and other natural resources. Although, there has been a trend of increase in production and productivity of vegetable crops since liberalization of seed trade in 1988 by Government of India, yet it has not been commensurate with the requirements. Compared globally, we are far behind in productivity of vegetable crops in spite of being second largest producer after China.

2.1    Introduction

The hot and usually wet conditions in tropics adversely affect the performance of insecticides as well as biology of the pests. Pesticide usuage is declining throughout the world, but in tropics it is likely to increase threatening basic biological components of pest management, environment and safety of people.  Pest management in tropical agriculture is basically influenced by high diversity of organisms, diversity of physical features and ecosystems, moderate seasonal weather changes, and the human factor. The high biological diversity of the tropics includes a wide range of interacting organisms from which have been identified pests that affect health crops and livestock as well as cultural practices for pest management.  Physical features of the tropics are also diverse, and include high-altitude temperate zones, rain forests, savannah woodlands, grasslands, and desert zones. Each zone has its own biological diversity either existing in isolation or overlapping with others. Moderate seasonal weather changes in the tropics affect populations indirectly, through modification of interactions between organisms.

6.1 Introduction

The sensitivities of plants and of crop yield to a changing climate, is a major challenge for the agricultural research community to relate these findings to the broader societal concern with food security. This chapter reviews the direct effects of climate on both crop growth and yield and on plant pests and pathogens and the interactions that may occur between crops, pests, and pathogens under changed climate. The better understanding of the roles of pests and pathogens in crop production systems that might   make to enhanced food security is discussed. Evidence for the measured climate change on crops and their associated pests and pathogens is starting to be documented. Globally atmospheric CO₂ has increased, and in northern latitudes mean temperature at many locations has increased by about 1.0–1.4 ^°C with accompanying changes in pest and pathogen incidence and to farming practices. Many pests and pathogens exhibit considerable capacity for generating, recombining, and selecting fit combinations of variants in key pathogenicity, fitness, and aggressiveness traits that there is little doubt that any new opportunities resulting from climate change will be exploited by them.

INTRODUCTION

The concept of hurdle technology has been developed as a new way to realize safe, stable, nutritious and economical foods. It employs combination of different preservation techniques to achieve a multi-target, mild but reliable preservation of foods. The application of hurdle technology in food preservation is increasing rapidly worldwide. Over the years, insight into the hurdle effect has been broadened and the application of hurdle technology has been extended. A better understanding of the occurrence and interaction of food preservative factors (hurdles) in foods is the basis for improvements in food preservation. If the hurdles for the microbes are known, the microbiological stability and safety of this food might be optimized by changing the intensity or quality of these hurdles. Using the proper combination of hurdles, it is possible to improve not only the microbial stability and safety but also the sensory and nutritive quality as well as the economical aspects of food. The hurdle concept is also referred to as food preservation by combined methods, combined process, combination preservation or combination processing techniques. The hurdle effect is of fundamental importance for the preservation of foods. The illustration of hurdle effect was first introduced by Leistner in 1978. Based on the understanding of hurdle effects, the concept of hurdle technology was derived (Leistner 1985).

INTRODUCTION

A mixture is a combination of two or more elements or compounds in any proportion so that the components do not lose their identity. Most materials in our world are mixtures and very few materials are pure substances. Foods are complex mixtures of compounds and the extraction or separation of food components is fundamental for the preparation of ingredients to be used in other processes. Separations usually aim to remove specific components in order to increase the added value of the products, which may be the extracted component, the residue or both. Purposes include cleaning, sorting and grading operations, extraction and purification of fractions such as sugar solutions or vegetable oils, recovery of valuable components such as enzymes or flavour compounds, or removal of undesirable components such as microorganisms, agricultural residues or radionuclides. For example, cooking oils from oilseeds or gelatin from connective tissue; or for retrieval of high value compounds, such as enzymes (e.g. papain from papaya for meat tenderisation or rennet from calf stomachs for cheese making). Other types of separation methods are used to sort foods by separating them into classes based on size, colour or shape and to clean them by separating contaminating materials.

Abstract

Indigenous Peoples of northwestern North America have utilized several hundred local plant species, as well as some algae, lichens and fungi, in their traditional diets. Many of these are also used in traditional healing, and some have potentially harmful or poisonous properties that must be taken into account in harvesting and preparation. Other species, known primarily for their medicinal use, also have noted toxicity if used improperly or without constraints. In this study, a total of 375 traditional food and medicine plants, fungi, lichen and algal species, as well as those species reported to be toxic by indigenous knowledge holders, were surveyed across 12 First Nations groups, each with distinct languages, for overlaps across the categories of food, medicine and toxic species. A complex of species use and avoidance emerged, modulated by processing, dosage, and other factors, with significant numbers of food species with reported healing properties, food species also used as medicine, and both food and medicinal species known to be harmful or toxic under some circumstances. Even most of those species considered extremely poisonous have been taken internally as medicines in some way by some groups.

Abstract

Scholars have long been interested in the effects of markets on the diet of native populations because of diet’s direct impacts on health. Exposure and assimilation into a market economy result in shifts in modes of subsistence and decision-making about food consumption. But the clear direction of influence is often elusive. Increased market integration predicts expanded access to goods and services that may improve household and individual diet. At the same time, greater involvement in market trade can shift economic priorities away from secure subsistence production toward the lure of material gain and novel items. Here, we analyze the effects of integration into the market economy on household diet using data from a panel study of two villages of Tsimane’, an indigenous group of lowland Bolivia. Because the Tsimane’ have been undergoing varying degrees of integration into the market economy, they provide an ideal population among which to examine the relation between markets and dietary change.

Abstract

The Saanich (Coast Salish) are an Indigenous people of southern Vancouver Island on the southwest coast of Canada who for many centuries have relied heavily on anadromous Pacific salmon (Oncorhynchus spp.) as a major food source. Over time, Saanich fishers have become experts on many aspects of these salmon, including knowledge of the different species, their life cycles, feeding ecology, migration routes, and population dynamics. Much of this knowledge is centered at Saanich Inlet and Goldstream River, a major salmon spawning stream flowing into this inlet. Some Saanich and other Coast Salish people still fish for salmon at Goldstream using traditional gaff hooks and spears, but they have also adopted more modern gear in recent times. Pacific coho (O. kisutch) and chum (O. keta) salmon stocks in particular have fluctuated over the decades, evidently due to impacts of commercial fishing, pollution from oil leakage and domestic sewage in Saanich Inlet.

Agricultural sector need efficient functioning of its markets to stimulate economic growth and incomes of the large rural population dependent on agriculture. More than three-fifths of India’s population draws their livelihood from agriculture that adds just one-fifth to its GDP. There should be obvious serious concerns about efficient functioning of this sector both in terms of its output / productivity and its marketing. While output and productivity are supply side factors, markets provide an intermediate link between producers and final demand by consumers. An efficient marketing system is pertinent for optimization of the resource use, output management, improving farm incomes, growth of agro -based industry and enhancing value addition. The efficient markets are also important for the stable consumer prices, higher returns to the farmers and reducing post harvest losses. Efficiently functioning markets add to welfare of producers as well as consumers. For markets to work efficiently it is pertinent to link the farm gate with retail outlets so as to reduce losses and marketing costs. However, it requires an institutional framework and infrastructure to prepare the produce in the form demanded by the consumers.

Price mechanism is an economic term that refers to the buyers and sellers who negotiate prices of goods or services depending on demand and supply. A price mechanism or market-based mechanism refers to a wide variety of ways to match up buyers and sellers through price rationing.An example of a price mechanism uses announced bid and ask prices. Generally speaking, when two parties wish to engage in a trade, the purchaser will announce a price he is willing to pay (the bid price) and seller will announce a price he is willing to accept (the ask price).

Sugar originated from the Arabic word “sharkara” and is derived from the sanskrit world “sharkara”. Sugar is an important part of the daily diet and  forming a class of edible substances which includes  sucrose, lactose, and fructose. It provides the human body with requisite carbohydrates and is basically extracted from sugar cane and sugar beet.  Found in fruits, honey, sorghum, sugar maple and in several other sources, it is the main ingredient of candy which is loved by children the world over. Yet, it has been  blamed for causing tooth decay and excess consumption of sugar has been associated with a host of ailments like diabetes, obesity, weight gain, depression, joint pain, fatigue and insulin resistance and even cancer.

1.0. INTRODUCTION

The plant nutrient cycling depends on micro organisms that constitute major components of the biosphere. Although less than one per cent is cultured, a tremendous diversity exists in their populations. Transformation of nutrients from soil to plants is brought about by soil microorganisms. Latest molecular techniques enable scientists to understand and appreciate the diversity and help to utilize the beneficial effects of microbial diversity for increased productivity. Among soil organisms intense activity is found in and around rhizosphere of plants because of the presence of the secreted nutrients such as carbohydrates, amino acids and other cellular components present at the growing tip of roots. These root colonizing micro organism form symbiotic, associative, or parasitic relationship with the plants. These organisms have evolved mechanisms to occupy and reside in the specialized niche. These mechanisms are often utilized both for growth enhancement and disease suppression. The host also plays an important role in selecting its own microflora for the rhizosphere similar to the probiotic microflora of human gastrointestinal tract (Haas and Keel 2003).

Tomato, Lycopersicon esculentum Mill. is an important vegetable cultivated throughout the world; both outdoors and under protected structures for fresh market consumption and processing. In India this nutritive rich vegetable is grown over an area of 0.60 m ha with an estimated production of 11.9 mt. Productivity of tomato in India is lower (18.6 t/ha) than the world productivity (27 t/ha) (Anonymous 2009). Tomato is grown in a wide range of climatic conditions across states of Andhra Pradesh, Orissa, Karnataka, Maharashtra, West Bengal, Bihar, Gujarat, Uttar Pradesh and Chhattisgarh. Tomato crop is highly sensitive to environmental stress caused by high temperature and low soil moisture. In fact, temperature is rising in the tomato growing locations and can cause reduced fruit set and lower the quality of fruits.

Phosphorus is one of the essential nutrients for plant growth. It is an integral part of the cellular activities of the living organisms. It has a defined role in plant metabolism such as cell division, development, photosynthesis, break down of sugar, nutrient transport within the plant, transfer of genetic characteristics from one generation to another and regulation of metabolic pathways. Phosphorus is a frequently limiting macronutrient next only to nitrogen for plant growth and makes up about 0.2% of plant dry weight. The plants obtain their P requirement from the soil pool. It occurs in soil as inorganic phosphates, produced by weathering of parent rock or as organic phosphate derived from decayed plant, animal, or microorganisms.

Emphasis of present day agriculture is to produce more with lesser land, water and man power. Apart from natural calamities like drought, flood etc., biotic stresses like pests, diseases and weeds also influence the crop productivity greatly. Sixty to eighty per cent of the total crop losses are attributed to the devastations caused by pests and diseases. Farmer’s income in recent years is decreasing gradually due to increased cost of inputs particularly in plant protection. The excessive dependence on chemical pesticides leads to the development of resistance in insect pests and pathogens, out breaks of secondary pests and pathogens / biotypes and occurrence of residues in food chain. To avoid this situation the concept of Integrated Pest Management (IPM)/ Integrated Disease Management (IDM) approach should be considered on top priority.

Abstract

Forests are the second largest land use after agriculture in India covers around 24% of the geographical area. The key tree species like Teak, Sal, Shisham etc are commonly used for timber purposes however the species like Eucalypts, Acacias, Poplar, Melia and Leucaena are mainly used under agroforestry system in India. The most of the genetic material (seed/planting stock material) used in forestry sector in India is obtained from unspecified sources, from stands, natural or planted, which are neither classified nor managed specifically for seed or planting stock material production.

Abstract

Intellectual property has increasingly assumed a vital role that we are witnessing today with the rapid pace of technological, scientific and medical innovation. Moreover, changes in the global economic environment have influenced the development of business models where intellectual property is a central element establishing value and potential growth. In India several new legislations for the protection of intellectual property rights (IPRs) have been passed to meet the international obligations under the WTO Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPS). Forest seed of economic importance and the non-timber forest products (NTFPs) play a very important role in the country’s economy.

Tillage operations are the basic operation, which need to be performed at proper moisture and temperature condition (climatic factor) to attain high degree of germination and better plant growth. Tillage may be defined as mechanical manipulation of soil for the purpose of germination and plant growth but it also does the followings:

1.    Introduction    360
2.    Feedstocks for Biodiesel Production    361

    2.1.    Fats and oils, 362
    2.2.    Alcohols, 363
    2.3.    Catalysts and neutralizers, 367

1.    Introduction    392

2.    Landfill Gas    393

3.    Biogas    394

    3.1.    Benefits of biogas, 394
    3.2.    Potential of biogas, 395
    3.3.    Biogas production system, 396
        3.3.1.    Raw materials, 396
        3.3.2.    Biogas technology, 398
        3.3.3.    Process of anaerobic fermentation for methane generation, 400
        3.3.4.    Conditions for anaerobic fermentation, 404
        3.3.5.    Sludge-algae-methane system, 407
        3.3.6.    Biogas plant, 408

Earth provides enough to satisfy every man’s need but not every man’s greed.
—Mahatma Gandhi
The term ‘environment’ is derived from French word ‘environner’, which literary means ‘to surround’ or ‘to encircle’ i.e. everything either living (plants, animals, microbes) or nonliving (soil, water, air, temperature, humidity etc.) surrounding us makes our environment. The universe is full of uncountable number of stars, planet and satellites, which has specific type of environment but earth is the only known planet in the universe that contains life supporting environment. The earth environment is a collective term for the nature or ecosystems, that we use and benefit from on a local, national and global scale. The earth ecosystems provide number of benefits called ecosystem services, free of cost.

Plant cell culture
Introduction

As the human population is expanding there has been increasing concern over whether current rates of food productions can support the growing population. In response to the increasing demand, scientists and farmers have been working hard to come up with new ideas to meet these needs. These ideas range from simple procedures including selection of the best seeds to more complex procedures requiring the transplantation of genes into different plant species. This chapter focuses on one of the important aspects of plant science which is the growth of plant cells in an artificial media. This process is known as plant cell culture and can be applied in many different ways. 

Summary

Human activities involving rapid industrialization and urbanization without concomitant environmental planning have resulted in a situation where substantial parts of our land and water resources have been polluted with organic and inorganic toxicants.  Environmental engineering principles have been utilized to detoxify polluted areas; however, the efforts, adopting predominantly physico-chemical methods, have addressed the issue to a restricted extent, focusing on solutions for specific categories of pollutants and applicable for limited areas, in addition to being expensive. Hence cost-effective sustainable alternatives in the form of bioremediation (involving microorganisms) and phytoremediation (involving plants alone or along with associated rhizospheric microorganisms) are gaining public acceptance. Considerable scientific evidence has proved that many plant species can detoxify the pollutants utilizing various mechanisms. In this background, in vitro plant cultures have served as invaluable tools in identifying appropriate plant species for phytoremediation. Better understanding of the complex interactions underlying phytoremediation has been facilitated using in vitro cultures where the only variable is the pollutant, in contrast to field experiments where there are many confounding variables. While straightforward extrapolation of in vitro data can be erroneous, these systems provide the basic framework for translating laboratory-scale experiments to field-scale technologies.

A close look on three disciplines of Parasitology reveal that these are the branches where a scholar initially select them as per his basic qualifications. But while pursuing research in Parasitology, the line of demarcation becomes blurred and it is in fact combination of a group of scientists,from varied disciplines, who are able to solve any one problem; at that point, it is absurd to divide the subject as medical or veterinary or basic parasitology. In fact, these will be your interests and experiences which will decide your line of research and will determine your achievements.

Abstract

Present implementation of mass spectrometers has allowed developing new approaches in algal research. Soft ionization techniques like atmospheric pressure chemical ionization (APCI), electrospray ionization (ESI), and matrix assisted laser desorption ionization (MALDI) extend the analytical possibilities of mass spectrometry (MS) beyond classical fatty acid analysis by gas chromatography (GC) with electron impact ionization (EI). New MS-based analytical methods have been developed over the last two decades for algal molecule research including membrane lipids, carotenoids, mycosporine-like amino acids and peptides.
 
MS-based Metabololomics approaches have also been used to gain insights into algal biochemistry and physiology. This review aims at highlighting the achievements in algal research gained by using these recent research tools and their future prospects.

Diverse soil and climatic conditions prevailing in different parts of the country offer scope for cultivation of a variety of crops in India.  Around 250 crops either cultivated or grown under natural habitat are used for vegetable purpose.  The crops and varieties vary in their soil and climatic requirements, cultivation practices, resistance to pests and diseases, quality etc.

Considering the climatic conditions for growing vegetable crops and for evolving zone wise technologies and recommendations, the entire country is divided into eight agro-climatic zones under the All India Coordinated  Research Project (Vegetable Crops) as given in Table 1.

Abstract

Tea (Camellia sinensis L. O. Kuntze), a foliage crop of Sub-Himalayan Terai-Dooars has Tea mosquito bug (Helopeltis theivora)(TMB), looper caterpillars [Hyposidra talaca, Hyposidra infixaria, Biston (=Buzura) suppresseria] and Red spider mite (Oligonychus coffeae)(RSM) as major pests. In conventionally managed tea plantations, synthetic pesticides and acaricides are routinely applied. The pesticide-exposed pest populations show higher tolerance level as evident in their increased LC50 values. Augmented activities of detoxifying enzymes viz. general esterases (GE), glutathione S–transferases (GST) and cytochrome P450 mediated monooxygenases (CYP) were recorded in the pesticide-exposed pest populations. Sub–lethal exposure to monocrotophos (36% SL) enhanced the tolerance level in adult TMB by 105 fold through three generations. Increased activity of GE was evident in the pesticide-exposed populations of the tea loopers. Activities of GE and GST  in RSM were significantly higher in acaricide-exposed population. Present studies can help developing enzyme-based assay kit for determining level of pesticide-resistance. Integrated resistance management has become an integral part of modern day IPM practices. Adoption of newer chemicals, and cultural practices can minimise synthetic pesticide applications, thereby help reducing resistance development in pests.

India is bestowed with diverse agroclimatic zones which aids in the cultivation of large number of commercial flowers like rose, gladiolus, chrysanthemum, tuberose, jasmine, marigolds, orchids, lavender, lily, anthurium, gerbera, potted plants, cut foliages, bedding plants etc. In floriculture trade, value addition takes place at every step to create a novel product and to cater the demand of heterogeneous consumers. In the international floriculture trade, besides floriculture and pot plants, many other value added products include artificial colouring of the flowers to create novelty, aqua-packing for better presentation and attraction, three dimensional window packing of flowers for greater visibility, garland, venis, bouquets, flower arrangements etc.

Application of manures and adoption of proper cultivation practices have profound influence in yield and quality of tubers. There crops also need macro nutrients (N,P,K which are primary nutrients and Ca, Mg and S which are secondary nutrients) and micro nutrients (Fe, Mn, Zn, Cu, Mo, B) for their maximum yield potenial.

the package of practices vary with crop and again with soil, climate, edaphic and topographic factors, especially with reference to tropical tuber and root crops. The yield can be maximized through good agronomical practice and by adoption of proven recommended production technologies. Soils, climate, topographic and edaphic factors suitable for each crop alongwith salient cultivation practices and production technologies are enunciated for important tuber and root crops in various parts of India.

Tuber crops grown in India include Cassava, Sweet potato, Dioscorea, Colocasia, Amorphophallus and minor tuber crops like Chinese potato, Arrowroot, Canna, Yam bean etc. Biotechnology can contribute solution to the major problems and realize greater benefits for tuber crops. Traditional breeding in tuber crops is difficult due to their heterozygous nature, low fertility, out crossing coupled with strong inbreeding depression. Many of the agronomic traits are polygenic and/or recessive which make breeding for such characteristics complicated. Biotechnology is a powerful tool to complement traditional breeding. Developments in the field of tuber crops biotechnology are discussed below.

Abstract
    
The amount of data being collected across a wide variety of fields today far exceeds our ability to reduce and analyze without the use of automated analysis techniques. In addition, the whole data may not be of user interest and imperfect. Therefore, it is very challenging to organize this data in formal system, which provides outputs in more relevant, useful, and structured manner. There are many techniques available to retrieve knowledge from this voluminous data. This paper discusses different rough computing based information retrieval techniques to obtain meaningful knowledge from large amount of datasets. We also discuss a real life example to show the viability of proposed research.

Introduction

Northeastern Region of India consists of eight States, viz., Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Tripura and Sikkim.  The northeastern states are located between geographical ordinates, 21° to 29°30' N and 89°46' to 97°30' E. The region, surrounded almost on all sides by Bhutan, China, Myanmar and Bangladesh, which can be broadly divided into two characteristic zones viz., Mountainous and Plain. Although distinguished in the altitude differences, both the mountain and plain are closely interrelated in terms of natural resource sharing and economic flow. According to the physiographic characters this region is divided into five physiographic units, the Assam Himalayas, the Brahmaputra valley, the Shillong plateau, the Barak valley and the Southeastern hill region. Except the Brahmaputra and Barak valleys in Assam and the Imphal valley in Manipur, the terrain is hilly and mountainous, only making 65% of the northeast an undulating land with elevations ranging from 200 to 900 m above MSL

No society can ever desire to achieve a long-term goal of sustainable development unless it builds upon its own knowledge, traditions, ethical foundations and technological endowments. The knowledge of the people particularly in drought and flood prone regions, hill areas, tribal areas and other high risk environments, has to become a building block of new technological improvements. Knowledge happens when our expectations are belied, modified and sometimes confirmed. Because the asymmetry in our expectations is influenced by our access to resources, institutions, technology and cultural platforms, we get different kinds of knowledge, even when we confront similar situations Gupta (2005). In any community living close to nature, asymmetry in knowledge generation and its utilization is inevitable. The experts exist not just in our profession, but in every profession.

The role of leguminous plants in improving the soil fertility is known for centuries. The nitrogen uptake in legumes by some unknown process was demonstrated through agronomic experiments by J.B Boussingault in 1838, which was opposed by Liebig and others. The presence of bacteria in the roots nodules of legumes was observed by P.G Lachmann (1858). M. Woronin (1866) further examined and observed them to be rod-shaped and motile.

Life forms are composed of one of two basic cell types : Eukaryotic or Prokaryotic. Generally, eukaryotic cells are larger and more complex than the prokaryotic cells and possess a membrane-enclosed nucleus; eukaryotic means ‘true nucleus’ (eu=true; karyon = nucleus). All plants, animals, fungi, protozoa and algae are composed of eukaryotic cells. Only the microorganisms classes as bacteria and the archaea are prokaryotic cells. Prokaryotic cells have no nuclear membrane and therefore lack a true nucleus. The latin prefix pro means ‘early’ and in this instance suggests the somewhat primitive nuclear structure found in bacterial cells. Eukaryotic microorganism are sometimes simply referred to as eukaryotes, and the prokaryotic microbes as prokaryotes.

SYNOPSIS

Food security is a complex issue, linked to availability and access to food, malnutrition in the population, economic development, environment, and local and global trade. Malnutrition hinders healthy growth and proper development of the human immune system affecting neurological and cognitive development especially in children.

Hydro-climatology is defined as the investigation of the impact of climate upon the waters of the earth. This topic includes hydrometeorology, the water processes of evaporation (surface and near surface), rainfall-runoff, and groundwater studies (Langbein, 1967; Wendland, 1998). Hydroclimatology provides a systematic foundation to assess how the climate system causes spatiotemporal changes in the hydrologic cycle with respect to global or local aspects. Variations in the relationship between the hydrologic cycle and the climate system underlie droughts, floods, and future impacts of global warming on available water resources. Both land and satellite based data and computer programming and modelling contribute to our knowledge of the spatiotemporal changes of physical processes shared by the hydrologic cycle and the climate system (Shelton, 2009).

5.1  Write True/False

Q.1    The null hypothesis H₀ is said to be composite if it does not specify the joint probability of x₁, x₂, ......, x_n completely.
Q.2    We may write null hypothesis as :
    H₀ : θΣ Ωθ_0-

ABSTRACT

Pesticide degradation is the breaking down of toxic pesticides into a non-toxic compounds and, in some cases, down to the original elements from which they were derived. The most common type of degradation is carried out in the soil by microorganisms, especially the fungi and bacteria. Microbial degradation depends not only on the presence of microbes with the appropriate degradative enzymes, but also on a wide range of environmental parameters. Pesticides which are rapidly degraded are called non-persistent while those which resist degradation are termed as recalcitrant (persistent). Microorganisms are able to degrade a large variety of compounds, including pesticides under laboratory conditions. However, methods have yet to be developed to decontaminate the environment from pesticide residues. Continuous efforts are required in this direction, and at present several PGPR capable of degrading pesticides have been isolated from the natural environment. Catabolic genes responsible for the degradation of several xenobiotics, including pesticides, have been identified, isolated, and cloned into various other organisms such as Streptomyces, algae, fungi, etc. In addition, recombinant DNA studies have made it possible to develop DNA probes that are being used to identify microbes from diverse environmental communities with a unique ability to degrade pesticides. Bioremediation treatment still requires more intense research through specific microbial degradation of broad range of organic pollutants. This review describes recent advances in biodegradation of pesticides by addressing the microbes involved in pesticide degradation.

B    :    Born.     
B cell, also known as a B lymphocyte      :    One of the major types of cells in the immune system. B cells can differentiate to form memory cells or antibody-forming cells. OR A type of lymphocyte derived from bone marrow stem cells that matures into an immunologically competent cell under the influence of the bursa of Fabricius in the chicken and bone marrow in nonavian species. Following interaction with antigen, it becomes a plasma cell, which synthesizes and secretes antibody molecules involved in humoral immunity.

The north eastern hill region covers a large share of acid soils of India occupying 14.95 m ha which is a major constraint for sustainable crop production. Acid soil limits the availability of calcium and phosphorus in soil, lowers base saturation and reduces microbial activities in soil adversely affecting the crop growth and yield. About 95 % of the soils of this region, except Nagaland (about 70 %) are acidic in reaction. About 84, 77, 76, 60, 57 and 47 per cent soils of Arunachal Pradesh, Manipur, Meghalaya, Mizoram, Sikkim and Tripura, respectively have soil pH below 5.0 and are considered strongly acidic (Panda, 1998). The soils are highly degraded because of heavy rainfall and removal of top soils. Land slides are also contributing towards land degradation. About 16 % of the area is affected by water erosion (www.india stat.com). About 53.8, 28.2, 42.6, 53.9, 89.2, 60, 33 and 59.9 per cent  area are degraded in Arunachal Pradesh, Assam, Manipur, Meghalaya, Mizoram, Nagaland, Sikkim and Tripura, respectively. Including Assam, north-east constitutes 80 % of the total area under acid soils of the country. The land use pattern of north-east region is presented in table 1 and area, production, yield of foodgrains and fertilizer consumption are presented in Table 2.

Jharkhand state lies between 21º58’2" to 25º8’32" North latitude and 83º19’05"to 87º55’03" East longitude covering an area of about 7.97 m.ha. and accounts for  2.4 per cent of  the total geographical area (TGA) of the country. It is bound on the east by West Bengal, on the west by Chhattisgarh, on the north by Bihar and on the south by Odisha. Reliable information on the location, extent and quality of soil and land resources is the first requirement in planning for the sustainable management of land resources. The components of land i.e., soils, climate, water, nutrient and biota are organised into an eco-system, which provides a variety of services that are essential for the maintenance of the life support system and the productive capacity of the environment.