eChapters

Abiotic stresses include salinity, drought, flood, extremes in temperature, heavy metals, radiation etc. They are the foremost factors that causes the loss of major crop plants worldwide. This situation is going to be more rigorous due to increasing desertification of world’s terrestrial area, increasing salinization of soil and water, shortage of water resources and environmental pollution.

The inadequacy of water availability, including precipitation and soil moisture storage capacity, in quantity and distribution during the life cycle of a crop to restrict the expression of its full genetic yield potential”. Generally drought stress occurs when the available water in the soil is reduced and atmospheric conditions cause continuous loss of water by transpiration or evaporation. Drought stress tolerance is seen in almost all plants but its extent varies from species to species and even within species.

SUMMARY

Abiotic stress can be reduced by choosing the most appropriate pulse species and adjusting agronomy (sowing time, plant density, soil management) to ensure sensitive crop stages occur at the most favourable time in the season. For example choosing the optimum sowing time, species and cultivars with appropriate phenology can reduce the effect of frost and drought in pulse crops in dry land environments, which termed stress.

             Most appropriate approach of dealing with stresses caused by extremes in the abiotic environment is to develop cultivars resistant to specific stresses. However, breeding and selection for resistance to these stresses is often considerable difficult because of the unpredictability of climatic conditions. Drought and heat escape through earliness in flowering and maturity is probably the characteristic most widely used by breeders for pulses and other crops to escape drought especially in low rainfall, terminal drought environment. Lack of simple and accurate screening procedures to screen parental genotypes and breeding population for various abiotic stresses is the major bottlenecks in the development of stress tolerant cool season pulse crops.

Tremendous genetic diversity occur within different crops of this family with respect to their adaptability. Some cucurbits are grown in tropical, subtropical or arid deserts whereas other prefer to grow in temperate conditions. Harvested fruits and vegetables can be potentially exposed to numerous abiotic stresses during production, handling, storage and distribution (Hodges, 2003). However, when the abiotic stress is moderate or severe, quality losses almost always are incurred at market (Toivonen, 2003). Annually about 42% of the crop productivity is lost owing to various abiotic stress factors (Oerke et al., 1994). One of the key factors for abiotic stress in crop plants is the ill effect of global warming which may cause reduced precipitation, less snow pack, and earlier snow melt, leading to drought conditions. In addition about 20% of the world’s irrigated lands are affected by salinity (Zhu, 2001), a situation worsened by climate changes.

A woman is the backbone of the family. The Self-reliance of women is the first step in the nation’s development. For generations, women have fought for their existence. Women’s softness and humility have developed new dimensions of self-reliance; as a result, the image of a woman with a veil of weakness has ended.

The position of women in ancient times was excellent. The most significant decline occurred in the status of women during the Mughal period. 

Animal’s response  to external stimuli is a behavior. Domestic animal behaviour and performance are correlated. Man’s intervention has led to huge modifications and modulations in animal behaviour patterns over ages but certain characters and normal behaviours of animals are needed to be expressed, otherwise may lead to abnormalities or performance loss. Animal freedoms also ensure certain basic freedoms to domesticated animals including freedom to express normal behaviour. With the developing concern over animal welfare among consumers, growers and animal activists, the need to ensure animal freedoms is call of the hour. Measuring animal welfare is a complex process which requires multidisciplinary approaches. There are four approaches to determine animal welfare viz, productivity, animal health and disease, physiology and behavior which are used individually or in combination.

Egg Formation Phenomenon

The chicken egg consists of a very small Reproductive cell or Germinal disc [orBlastoderm;which iscapable of developingintoanEmbryo, iffertilized by a Sperm]. This tiny cell is surrounded by :

• Yolk
= OVARYis responsible for its synthesis.

• Albumen, Shell membranes, Shell and Cuticle
= These are produced in the OVIDUCT.

[A] OVARY

Although there are two ovaries and two oviducts in the hen, but only the left ovary and left oviduct are functional [because, the right ones are atrophied during embryo development]. Before egg production, the ovary is a group of small follicles of different sizes containing ova.

Formation of Yolk

• The yolk is just a source of food material for the small Reproductive cell (Blastoderm).

• Major amounts of yolk material is produced in the liver and transported to ovarythrough blood.

• Two days afterthe formationof First yolk. Second yolkbegins to develop.

• It takes about ten days for a yolk to mature.

Departure of waves ( P,Q,R,S, T), segments (P-R, S-T and T-P) and /or intervals (P-R, Q-T, R-R) from their normal values (configuration, morphology, amplitude and duration of wave; prolonging /shortening of intervals : elevation /depression of segments from their isoelectric line) is said to be abnormal feature of the electrocardiogram. These abnormalities are suggestive of specific cardiac abnormalities such as a defect in the current generation, its conduction or both; or change in the size of the chambers (atria / ventricles/both.).

As homogeneity is a basic criterion, it is important to know the solubility of solutes, which is a temperature dependent property. Besides temperature, solubility is influenced by the acidity (pH) of the solvent due to the acid-base character of the solute. Bases tend to dissolve better in acidic solutions, whereas acids do in basic solutions. Therefore, one often needs to change the pH of solutions accordingly. As the most widely used concentration units (molarity, w/v% and v/v%) refer the amount of solute in a given volume of the solution, it is the volume of the complete solution that must be set to the desired (calculated) value thus, one must consider not only the solvent but the solute(s) as well. Another reason why one must add the solute(s) to an amount of solvent which is less than the final volume might be that one will need to set the pH subsequently in order to enhance solubility and/or to reach a desired pH value. The volume of acid or base solutions used for pH setting is usually not known in advance and is not negligible. If the solute was initially dissolved in the final desired volume, one would exceed this volume during pH setting (even if the volume of the solute is negligible) and, thus, the solution would not have the desired (calculated) concentration but a smaller (and mostly unknown) one. Thus, according to the correct procedure, one must take into consideration the fact that the final volume will contain the volume of the buffering component. value particularly in the case of dissolving proteins, which have a tendency to stick to the bottom of the dish, thereby making dissolution substantially slower.

Units/measures are used to specify quantities. Every unit has a well-defined standard basic value, which is used as a reference in measurements. The units used in scientific practice constitute a scientifically established system, SI (Système International). Although only SI units are official , numerous non-SI units are still widely used (calorie, Ångström, Celsius etc.). We distinguish two types of quantities with two corresponding types of SI units. The base quantities cannot be derived from other quantities. Many of these are used in biochemistry (names of units and their symbols are given in brackets) to quantify the mass (gram, g), the length (meter, m), the time (second, s), the temperature (kelvin, K) and the charge (coulomb, C). Much larger is the group of derived quantities. Of these, the various units of concentration (to characterise the abundance of materials in solutions and other mixtures), volume and energy are the ones most frequently used in biochemistry. It is important to note that the terms mass and weight are often used interchangeably as alternatives. Technically, however, they have different meanings. The mass is the total quantity of matter in an object, which comes from the mass of all of its protons and neutrons, although not simply additively. Weight is a measure of the gravitational force exerted on an object. As the mass of protons and neutrons is the unit mass, their total mass in an object (e.g. the mass of a molecule, the molar mass) is a unitless number (e.g. the molar mass of water is 18). In other words, the molar mass is a relative number that would reflect the number of protons and neutrons in an atom or molecule, if the masses of protons and neutrons were additive. We make mass measurable by expressing it in grams because this way we can handle it as weight and measure it with a balance, the device developed for this purpose. 

Absolute advantage : This is the simplest yardstick of economic performance. If one person, firm or country can produce more of something with the same amount of effort and resources, they have an absolute advantage over other producers. Being the best at something does not mean that doing that thing is the best way to use your scarce economic resources. The question of what to specialise in—and how to maximize the benefits from international trade—is best decided according to comparative advantage. Both absolute and comparative advantage may change significantly over time.

Access to Health Care : 1) The degree to which individuals are inhibited or facilitated in their ability to gain entry to and to receive care and services from the health care system. Factors influencing this ability include geographic, architectural, transportation, and financial considerations, among others. 2) Entry to the health care system is dependent on the wants, resources, and needs that individuals bring to the care-seeking process. Ability to obtain wanted or needed services may be influenced by many factors, including travel distance, waiting time, available financial resources, and availability of a regular source of care.

Acquisition cost : The purchase cost of a drug to an agency, person or institution.

Adaptive expectations : A theory of how people form their views about the future that assumes they do so using past trends and the errors in their own earlier predictions. Contrast with rational expectations.

Abstarct

The Photosynthetically Active Radiation (PAR) measure of radiant power is important in evaluating the effect of light on plant growth. The photosynthetic response correlates better with the number of photons than with energy. This is expected because photosynthesis is a photochemical conversion where each molecule is activated by the absorption of one photon in the primary photochemical process. PAR is defined in terms of photon (quantum) flux, specifically, the number of moles of photons in the radiant energy between 400 nm and 700nm. One mole of photons is 6.0222 x 1023 photons ( 6.0222 x 1023 is Avagadro’s Number). The Phtotssynthetic Photon Flux Density (PPFD), i.e. the photon irridiance, is expressed in moles per squre meter and per second (formerly, Einsteins per squre meter and per second). The absorption of PAR by wheat varieties increased from 7.30 h to 11.30 h followed by a decline at 13.30 h at CRI, tillering and milking stages.

Definition-Purpose of abstract-Types of abstract-Abstract Styles-Steps for Writing Effective Abstracts- Some Do’s Don’ts in preparing abstracts.

Definitions

The word abstract comes from the Latin word abstractum, which means a condensed form of a longer piece of writing. Abstracts are important parts of reports and research papers and sometimes academic assignments. The abstract is often the last item that you write, but the first thing people read when they want to have a quick overview of the whole paper. We suggest you leave writing the abstract to the end, because you will have a clearer picture of all your findings and conclusions.

An abstract is a paragraph that provides an overview of a paper. Abstracts should be between 100 and 200 words long and usually contain a list of keywords at the end to help readers identify the main points of the paper. While abstract requirements differ across academic disciplines, there are two main types of abstracts: humanities abstracts and scientific abstracts.

Purpose of abstracts?

Abstracts typically serve five main goals:

4.1 Introduction

Precipitation is a major component of hydrological cycle. It occurs because of condensation of water vapour molecules in the atmosphere. When the precipitation falls on the grounds, it undergoes several phases before it appears as runoff in the streams. Certain amount of precipitations is intercepted by the foliage of plants and roofs and other parts of the building and other hydraulic structures. This intercepted water is called as interception loss which is evaporated to the atmosphere. Sometimes the dried surface of the buildings and other structures soak certain amount of precipitation while falling on them which also adds to interception loss. After striking the land masses, certain amount of the precipitated water gets infiltrated into the soil surface which then moves both in lateral as well as in vertical direction. This loss is called as infiltration loss. For the study of groundwater, infiltration loss is not a loss but rather it is a gain in terms of groundwater recharge. However for a surface water hydrologist, it is a loss since it decreases the amount of runoff contributing to the stream or any other water bodies.

A family of over 250 genera and 2,500 species, Acanthaceae are distributed mainly in tropics, but also in Mediterranean region, Australia and USA. Central America, Brazil, Africa and Indo-Malaysia are the 4 chief centres of
distribution. About 70 genera and over 340 species have been reported from India. Some of the largely represented genera along with the approximate number of their worldover reported species are Justicia (300), Strobilanthes
(250), Barleria (230), Thunbergia (200), Aphelandra (200), Decliptera (150), Blepharis (100), Staurogyne (80), Mendoncia (60), Crossandra (60) and Acanthus (50).
Selected Indian Genera
Acanthus, Adhatoda, Barleria, Eranthemum, Justicia, Peristrophe, Ruellia, Thunbergia.
Economic Importance
1. Ornamental plants include Aphelandra aurantiaca, Barleria cristata, B. gibsoni, Beloperone guttata (shrimp plant), Crossandra infundibuliformis, Eranthemum bicolor, E. nervosum, Fittonia gigantea, Jacobinia carnea, Justicia gendarussa, Ruellia brittoniana, Thunbergia coccinia, T. erecta, T. fragrans and T. grandiflora.

Etiology

It is a rare idiopathic primary dermatitis condition seen mainly in Daschund.

Acaricides: Acaricides are agents that kill members of class Arachnida like ticks and mites.

Acaricides are used both in medicine and agriculture, although the desired selective toxicity differs between the two fields.

What is acaricide resistance?

The ability of a parasite strain to survive and/or to multiply despite the administration and absorption of a drug given in doses equal to or higher than those usually recommended but within the limits of tolerance of the subject.

How does resistance develop?

• Animals are treated with the chemical (Acaricide), exposing nearly all of the tick population to the toxin.

• Susceptible individuals are killed, and those rare individuals that have some genetic resistance, survive.

• They reproduce, and pass along those “resistance genes” to the general tick population.

Chemicals which are used specifically for the control of mite pests are known as acaricides, though there are many insecticides, which show acaricidal properties as well. In the last few decades, there has been tremendous progress in the development of broad-spectrum acaricides i.e. the compounds that will knock down different species of mites at the same time. Prior to the commercial introduction of broad-spectrum insecticides like DDT and other organochlorine insecticides, mites did not commercially cause wide-spread damage under natural or semi-natural environments which were little influenced by man. This might be due to the natural processes of prey-predator relationship in undisturbed situations. Contrastingly in situations where broad-spectrum pesticides are commonly used, the natural enemies are more adversely affected than the mites, and an outbreak of the latter occurs. Besides becoming generally intensified with the introduction of modern insecticides, the mite problem in some cases has subsequently become even more serious due to development of resistance against these materials.

Many spider mite species, which were rarely found in pest form in some situations, appeared commonly as major pests with the persistent use of pesticides. In Indian literature, spider mites were never reported in pest form prior to 1940 but with the intensive use of pesticides, every year new mite problems are appearing and becoming troublesome to control.

The mites belong to the Class - ‘Arachnida’, Order - ‘Acarina’. Most of the phytopathogenic mites are classified under the two Families - Tetranychidae and Eriophyidae.

The mites belonging to the Family - Tetranychidae are generally known as Tetranychids. They are very minute, and less than 100 microns in size. The body is non-segmented and the head, thorax and abdomen are  not distinct, but rather fused together. The life cycle of a tetranychid mite consists of an egg stage, three nymphal stages viz., protonymph, deutonymph and tritonymph and an adult stage. In the protonymphal stage, which is also called the larval stage, the mites have only 3 pairs of legs. In all the other nymphal stages and the adult stage they have 4 pairs of legs. The mites are roundish or oval in shape, with biting and chewing, as well as piercing and sucking type of mouthparts (Fig.190).

The increasing capabilities of Large Language Models have created strong demand for real-time AI services, but their computational complexity makes low-latency deployment difficult on conventional systems. Transformer models require substantial memory, high computational throughput and efficient data movement, creating challenges for mobile devices, embedded systems, edge platforms and latency-sensitive applications. This chapter introduces hardware–software co-design as an integrated strategy for addressing these challenges. Rather than optimizing hardware and software independently, co-design aligns model algorithms with the characteristics of processors, memory hierarchies, accelerators and communication systems. The chapter examines hardware platforms including GPUs, TPUs, FPGAs and ASICs, together with software techniques such as quantization, pruning, knowledge distillation, operator fusion and memory scheduling. Hybrid architectures are discussed for reducing latency, improving throughput, lowering energy consumption and increasing scalability. Applications in healthcare, finance, autonomous driving, robotics, industrial IoT and real-time translation illustrate the importance of efficient inference. The chapter demonstrates that coordinated optimization across the full computing stack can bridge the gap between LLM capability and practical real-time deployment while maintaining acceptable accuracy and reliability.

1. Introduction

Economic growth and the commercialization of agricultural systems have enhanced the adoption of various technological interventions in the farming systems (Rola-rubzen et al., 2020). The green revolution is one of the successful examples of technology interventions, which led to the agriculture transformation and thereby brought reduction in the hunger and poverty of India (Minten and Barrett, 2008). It conclusively proved that the adoption of these farm technology interventions can increase production, productivity and farm income. The technology interventions consisted of a package of improved crop varieties, irrigation, fertilizers, plant protection chemicals, and agricultural machinery.It also brought to fore that the nation’s capacity to maximise its agricultural production potential also relied upon the responsiveness of farmers who were the ultimate decision makers. Thus the availability and accessibility of these technologies to the farmers, and their ability to adopt and utilise these technologies assumed paramount significance in the whole process.

Later decades of twentieth century proved that, along with men, women’s role is vital in agricultural production and they are the backbone of the rural economy in many developing countries including India. It is reported that women are responsible for more than 50 per cent of the world’s food production and account for about 43 per cent of the total agricultural labour force (Doss, 2018). In India, about 78 per cent of economically active women are engaged in agriculture compared to 63 per cent of men. Moreover,in rural India, almost 50 per cent of rural women are classified as agricultural labourers and 37 per cent as cultivators.

1. Introduction

Libraries play a crucial role as community centers that promote education, culture, and individual growth at a time when information is the currency of advancement. Rural libraries, however, confront unique difficulties that set them apart from their urban counterparts. Rural libraries often struggle with limited funding, being geographically isolated, and having difficulty obtaining technology infrastructure. Yet, in order to guarantee that rural libraries can provide the same caliber of service as their counterparts in larger cities, pricing and accessibility become vital factors. And in light of all of that, they continue to be vital community hubs that contribute significantly to education, cultural enrichment, and lifelong learning.

Open source solutions hold a lot of promise for addressing these problems.Open source software solutions are more affordable and flexible than proprietary software systems, allowing them to be tailored to the specific needs of any rural library. Among other reasons, the library staff finds it easier to catalog documents when they use these kinds of systems. Because these systems use simpler circulation techniques, they assist them with saving expenses while guaranteeing higher user involvement.

The adoption and use of a new technology causes disruptions in the sociocultural system of a nation and induces a change from established practices to distinctly different and complex forms of social practice. The deployment of ICT into the predominantly traditional societies of developing countries is therefore very disruptive. In view of this, a seamless integration of both the technical and socio-cultural systems of societies where technology transfer takes place is necessary for a thriving ICT deployment. Unfortunately, technological transfer to developing countries is driven by a perspective that is based on the development experience of Western industrialized nations.

It is indeed highly inspiring to see that in India, people are gradually getting aware of the multiple roles of Information Technology in the overall growth of the country. The bureaucrats and policy makers have equally emphasized the significance of exploring and exploiting the benefits of IT. Moreover, the governance has also realized that with availability of vital infrastructure Information and Communication Technologies can be used to improve the lives of the rural and underprivileged section of the Indian society, especially the ones living below the poverty line (BPL). Nonetheless, the Government will have to play the role of a catalyst in this huge integration project. A strategic framework including actors from Central & State Governments and Civil Society Organizations to capture the benefits of ICT and make it reach the countryside can do wonders in this regard.

20.1 Introduction

Physiological adaptations for air-breathing in bony fishes have fascinated researchers for well over a century. The metabolic rate of some fish is so high that dissolved oxygen in water becomes insufficient. Prolonged drought causes some f ish to develop devices to survive in the absence of water for a short period. To overcome these challenges, fishes have developed accessory respiratory organs that can function in both aquatic and aerial environments.

As an adaptation to specific environmental conditions, accessory respiratory organs develop in addition to the gills. The development of these organs is dependent on the availability of extra oxygen. The development of an accessory respiratory organ is most common in tropical freshwater fishes.

This chapter provides a readily available means of reference for helping in life threatening emergencies, accidents and for providing first aid, where any delay caused by the lack of medication or non-availability of the doctor can have serious consequences either in terms of life or in terms of resulting serious sickness.

As soon as possible competent medical help should be availed of in emergencies and accidents. In the meanwhile the homoeopathic medicines suggested hereafter would provide relief, would halt deterioration in most cases and may save life in many instances.

Emergencies can be life threatening. One of these can be severe haemorrhage, where copious bleeding can lead to death. Obstruction of breathing for different reasons is a matter for concern. Serious accidents are life threatening because there may be unmanageable bleeding, shock and pain.

Below, a list of few medicines and other items required for first aid in emergencies has been given. This can be helpful in homes, in factories and offices.

ABSTRACT

Queens of 4 post-emergence colonies of primitively eusocial wasp, Ropalidia marginata were observed for their propensity to acquire and handle foraged material on naturally occurring free foraging nest. The queens were inclined to acquire pulp loads than food loads. 

Book Keeping

What is book keeping?

Book keeping is defined as;

1. The art of recording business transactions (pecuniary transactions) in a regulator and systematic manner.
2. Book keeping is the science and art of correctly recording in books of accounts all those business transactions that result in the transfer of money or money’s worth.
3. Book keeping is an art of recording day to day business transactions in a set of books in a most systematic manner.
4. It is the process of analysing, classifying and recording transaction in accordance with preconceived plan.

Objectives of book keeping

How much have we earned this year?

How much during the past year?

Is our business improving?

Also, how much cash do we have?

How much our customers owe us?

MEANING & DEFINITION OF ACCOUNTING

Accounting is the science of recording, classifying and summarizing business transactions and events primarily of a financial character in a significant manner and interpreting and communicating the results to decision-making persons thereof.

The AICPA defined, Accounting is the process that are used in accounting, recording, classifying, summarizing and interpreting the monetary language in which financial language is expressed.

BOOK KEEPING & GENERAL ENTRY SYSTEM

Business Transactions can be recorded in any system, which provides the necessary financial position of a business and results of transactions. The Business transactions are recorded through systems of book keeping as maintained in accounting are as follows:

Book Keeping: This is an activity concerned with the recording of financial data relating to business operations in a significant and orderly manner. Book keeping is the record making phase of accounting. Accounting is based on a careful and an efficient book keeping system.

The essential idea behind maintaining book keeping records is to show correct position regarding each head of income and expenditure. It is concerned with the recording of business transaction in a significant and orderly manner which is mechanical and repetitive in character. 

Introduction

Accuracy and uncertainty analysis is an important step in preparation of surface map through geostatistical techniques or digital soil mapping approach. It is because that we rely on a map based on how much accurate it is and the degree of uncertainty associated with the estimates while the map was prepared. Any stakeholder for a soil map especially policy makers is interested in accuracy and uncertainty of the map before taking suitable land management decisions involving soil map as an input. Again the level of accuracy and uncertainty depends on the properties for which the map has been developed. If the property of interest is sensitive to environment or human consumption, then the accuracy level should be very high while the uncertainty level should be very low e.g. heavy metal concentration in soil, quality parameters of water etc.

Acetylcholinesterase activity in brain is measured by the method described by Ellman’s et al. (1961).

Reagents

1. Phosphate buffer (0.1M) (pH 8.0) Solution A: 5.22 g of K2 HPO4 and 4.68 g of NaH2 PO4 are dissolved in 150 ml of distilled water. Solution B: 6.2 g of NaOH is dissolved in 150 ml of distilled water. Solution B is added to solution A to get desire pH 8.0 and then finally the volume is made up to 300 ml with distilled water.

2. DTNB reagent 39.6 mg of DTNB with 15 mg of NaHCO3 is dissolved in 10 ml of 0.1 M phosphate buffer.

3. Acetylthiocholine (ATC) 21.67 mg of Acetylthiocholine is dissolved in 1 ml of distilled water.

Procedure

The brain tissue is weighed and 10% homogenate is made in 0.1M Phosphate buffer (pH 8.0). Take 0.4 ml aliquot of homogenate in a cuvette containing 2.6 ml phosphate buffer (0.1M) and 100 µl DTNB. The contents of the cuvette are mixed thoroughly by bubbling air and absorbance is measured at 412 nm in a spectrophotometer. When absorbance reached a stable value, it is recorded as the basal reading .To this 20 µl of acetylthiocholine is added and change in absorbance is recorded for a period of 10 min at intervals of 2 min. Change in the absorbance per minute determined.

“Only those who attempt the absurd can achieve the impossible.”

- Albert Einstein

Motivation– An inner state of need or desire that activates an individual to do something that will satisfy that need or desire.

The processes that are responsible for an individual’s intensity, direction and persistence of effort toward attaining a goal.

Key Elements

1. Intensity: how hard a person tries
2. Direction: toward the beneficial goal
3. Persistence: how long a person tries

Unique Achievement in Plant Breeding

Rice

TN-1: First dwarf variety of rice developed in world

IR-8: Second dwarf and first high yielding variety of rice developed in world

Jaya: First dwarf variety of rice developed in India

Many researchers successfully prepared synthetic seeds of crop plants. The major success of this technology is being elaborated in this chapter.

8.1. FIELD CROPS

Rice is the world’s most important food crop and a primary food source for more than one third of the world’s population. This crop has received considerable attention in biotechnology research progammes. Research in artificial seeds in rice is not scanty and this technology through somatic embryogenesis would offer a great scope for large-scale propagation of superior elite hybrids (Brar and Khush, 1994). However, success on artificial seeds research in field crops, especially cereals is still in infancy. However, many workers successfully encapsulated somatic and androgenic embryos of cereal crops (Datta and Potrykus, 1989; Suprasanna et al., 1996; Roy and Mandal, 2004 & 2008). Brar et al. (1994) emphasized the need for research on artificial seeds in rice through embryogenesis and outlined its impact on mass propagation of true-breeding hybrids. Somatic embryogenesis can also be used in the regeneration of genetically transformed plants (Vicient and Martinez, 1998). Subsequently those somatic embryos could be economically and successfully propagated though synthetic seed technology.

Introduction

The availability of food depends on the production and distribution while the access to food is determined by an individual’s purchasing power. Thus, the food security in the framework of economic welfare is the situation in which the lowest income strata has a near zero probability of being vulnerable to famine and in terms of calorie it requires a near zero probability of falling below the poverty line (Rentlinger and Selousky, 1978). Therefore, food security concerns every sovereign country, especially the developing and poor nations, owing to its profound implications for their socio-politico-economic stability and which co-exists with international diplomacy. According to 1998 annual report of International Food Policy Research Institute (IFPRI), about 73 million people would be added to the world’s population every year between 19952020 increasing it by 32 percent to reach at 7.5 billion. Much of the population growth is expected to occur in the developing countries mainly in India where the population is expected to increase by 36 percent to touch at 1.27 billion by 2020 and is likely to overtake China by 2035. Therefore, meeting the food and nutrition needs of growing and urbanized population with rising incomes will have profound implications for agricultural production and food security of the country and Himachal Pradesh is no exception.

Introduction

The optimum soil pH for plant production is one that is slightly acidic, at this pH soil microorganisms are most active and plant nutrients are readily available. At extremes of high (alkaline) and low (acidic) pH this delicate balance is disturbed and plant nutrients that were in adequate supply can become either deficient or toxic to plant growth. Some essential nutrients such as phosphorous, calcium, magnesium and molybdenum become unavailable if the soil pH becomes too acidic. Acidic conditions will result in a lowering of plant production in farming systems. This will result in reduced profitability and an increased reliance on fertilizers to sustain any form of productive agriculture. Correcting soil pH to a more favorable pH range will increase the availability of essential nutrients.

    1.    Acid soil
    2.    Causes of soil acidity   
    3.    Problem of soil acidity 
    4.    Management or Amelioration of soil acidity 
        a.    Lime requirement (LR): 
        b.    Liming reaction in soils      
        c.    Benefits of liming on acidic soils 
    5.    Calcareous soil  
    6.    Formation, characteristics & management of calcareous soil 

Introduction
In India acid soils occur in the high rainfall areas covering about 25 million hectares of land with a pH below 5.5 and 23 million hectares of land with a pH between 5.6 and 6.5. In India, acid soils occur in Assam, Meghalaya, Arunachal Pradesh, Mizoram, Nagaland, NEFA, Manipur, Tripura, West Bengal, Bihar, Uttar Pradesh, Himachal Pradesh, Jammu and Kashmir, MP, Maharashtra, Kerala, Karnataka, Tamil Nadu and Andhra Pradesh. Punjab, Haryana, Rajasthan and Gujarat are the only states in India where acid soils do not occur. Soil acidity is a limiting factor affecting the growth and yield of many crops all over the world. The basic problems concerning chemical properties of more acid soils are, besides acidity itself, the presence of toxic compounds and elements, such as soluble forms of Al, Fe and Mn, nitrites and various toxic organic acids. Aluminium (Al) toxicity is one of the major constraints on crop productivity on acid soils, which occur on up to 40% of the arable lands of the world. Al is the third most abundant element in the earth’s crust and is toxic to plants when solubilised into soil solution at acidic pH values. Very few plants can grow well in strong acid soils. Soil acidity below pH value 5.5 is generally injurious to plants. Plant roots are badly affected if the pH value exceeds limits of tolerance for particular crops. High degree of soil acidity (pH 5.0 to 6.5) decreases the availability of plant nutrients particularly phosphorus, calcium, magnesium, molybdenum, iron, manganese, potassium sulphur nitrogen, boron, copper and zinc. It also affects adversely the important microbiological processes, such as nitrogen fixation by Azotobacter, Clostridium and nodule inhabiting bacteria (Rhizobia) of leguminous plants

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.

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.

The state of Odisha located in the Coromondal coast of India has a tropical monsoon climate characterized by high humidity, high rainfall (1497 mm) and short and medium winter. It is the 10^th largest and 11th most populous state accounting about 5% of the geographical area and 4% of the population of the country. The geographical area of the state is 15.57 m ha, out of which 0.62 m ha is arable land. Agriculture contributes 28% to  state domestic production and employs 64% of the work force.

Introduction
Acid sulphate soils are formed when pyrite within a soil layer is oxidised, generating sulphuric acid. The oxidation of pyrite often results in yellow mottles of jarosite. The pH levels in greatly affected areas are often less than 4.0, and the associated environmental impacts include fish kills, retarded growth of crops and changes in water chemistry. Acid soils are distributed in tropical and subtropical regions, constituting approximately 30% of the ice-free land in the world, which is 50% of the world’s arable land. In China and India, 212 Mha or 12% of the agricultural land is classified as acidic. In India, about 28% of the total geographical area is affected by acidity of different degrees. Acid sulphate soils (ASSs) are a group of these soils having high soil acidity and other soil function limitations. These soils were termed as Kattecleigrondon or Kattakali by the Dutch farmers in the seventeenth century meaning ‘Cat Clays’ in English for soils of some reclaimed areas that became gradually highly acidic and developed prominent yellowish mottles and crusts composed of jarosite and related sulphates; in northern Germany, similar clays were called Maibolt.
Occurrence
They occur in many regions of the world, mostly along coastal areas where the land is inundated by sea water. Countries having extensive area of acid sulphate soils are:

Acids are chemical substances that are sour in taste and highly corrosive. The term ‘Acid’ was derived from a Latin word ‘acidus’, meaning ‘sour’. They emit sharp odour and transform litmus colour from blue to red. They lose their properties when alkalis are added to them. However, in this process, alkalis also lose their alkaline properties.

The acidifiers could be used to favourably manipulate the intestinal microbial populations and improve the immune response, hence perform an activity similar to antibiotics in feed. Acidifiers also improve the digestibility of nutrients and increases the absorption of minerals. The incorporation of organic acids also leads to thinning of the intestinal lining which facilitates better absorption of nutrients and its efficient utilization. However, their effect will not be similar among all types of organic acids as their mechanism of activity is based on its pKa value. At present, coated salts of acidifiers are available commercially for use in feed of poultry.

Pimples are very common in young people during their teen years. This condition, which is also known as acne, is apparently due to certain hormone changes in the body. It is particularly prevalent during early adolescence, from 12 to 16 years of age, and is more likely to occur in those who have an oily skin. In the early stages a blackhead or comedone blocks the outlet of an oil gland within the skin. This is not a serious problem, for it leaves no permanent effect.

If the sebaceous duct ruptures and the oily material ooze out between the layers of the skin instead of coming to the surface, there may be a cyst or swelling known as a sebaceous cyst. These are somewhat disfiguring, but not harmless unless they become infected and form small abscesses. When these heal they may leave ugly scars. Severe acne may occur on the shoulders, the back and chest, as well as the face and neck.

Effects of diet: Acne is not caused by diet, but certain foods definitely aggravate this condition, especially in some patients. Rich foods, such as chocolate, nuts, cola drinks, ice-cream, fatty meats, and excessive amount of sugar, all seem to aggravate this condition. Certain drugs, such as those containing bromides and iodides, may also play a part in some people.

Some girls develop one to two pimples just before menstruation. These only last a day or two and are of no consequence. But when acne continues over months or years, it is very distressing, especially to a young woman, and something should definitely be done to clear up the condition. Nervous tension due to family trouble may also play a part in continuing this difficult problem. Even in its mildest form, acne usually persists for a year or more until the hormone system of the body has become fully adjusted.