eChapters

Introduction

Millet is a very important cereal grain that many people around the world eat. In fact, over a third of the world’s population consumes millet. It’s the sixth most produced cereal crop globally. Some common types of millet include Jowar (Sorghum), Sama (Little millet), Ragi (Finger millet), Korra (Foxtail millet), and Variga (Proso millet). Among these, Bajra and Sama have more fat, while Ragi has the least. Millet has been cultivated for thousands of years and is used in many parts of the world. In the past, even the Romans and Gauls enjoyed millet-based porridges. Today, China, India, Greece, Egypt, and various African countries are the major producers of millet. In rural areas, some types of millet, like Finger millet and Sorghum, are eaten by people, while others are primarily used as animal feed. These millets have packed with several beneficial nutrients and play a crucial role in traditional diets in many regions. Compared to commonly used rice and wheat, millet is three to five times more nutritious. While wheat and rice mainly provide food security, millet offers not only food security but also health benefits and livelihood opportunities. It can help manage health issues like diabetes and high cholesterol.

In India, Karnataka is the top producer of millets, accounting for over 58% of global production. Despite its nutritional and health benefits, many people in India are not aware of the advantages of consuming millet. (Upadhyaya et al., 2007). Millets are fantastic crops when it comes to pest management. Traditionally grown millets don’t require pesticides and the land used for millet cultivation remains largely pest-free. Some millets, like foxtail millet, not only resist pests themselves but also serve as natural protectors against pests in storage conditions for other crops like green gram. This means there’s no need for fumigants to keep them safe. It has a treasure trove of micronutrients, including vitamins and beta-carotene, which are now seen as essential as pharmaceutical pills. In the present day, millets are exceptionally superior and serve as a solution to the widespread issues of malnutrition and obesity affecting a significant portion of the Indian population (Singh KP et al., 2012). Millets are rich in essential fatty acids, including linoleic, oleic, and palmitic acids, which are present in their free form. They also contain compounds like monogalactosyl, diacylglycerols, digalactosyl diacylglycerols, phosphatidylethanolamine, phosphatidylserine and phosphatidylcholine in bound forms. Although other fatty acids like arachidic acid, behenic acid and erucic acid are found in millets, they are in trace amounts. Millet oil can be a valuable source of linoleic acid and tocopherols. Additionally, millets are gluten-free and have an alkaline effect in the body. They contain essential B vitamins such as niacin, folacin, riboflavin, and thiamine, as well as phosphorus. These nutrients play a crucial role in energy synthesis within the body.

Introduction

In the middle of the 1900s, the world experienced a big increase in people, leading to a greater need for food. This demand for more food pushed for a farming revolution called the “green revolution.” This revolution used chemicals to help grow more crops and fight plant diseases. But using lots of these chemicals caused problems for the environment and people’s health. Even with all these chemicals, a large amount of food (up to 25% of what’s grown) is still lost to diseases each year. By 2050, we might need to double how much food we make. To do this without harming the environment or health, we’re looking for new ways. Some ideas include making plants that are genetically modified, creating plant varieties that resist pests naturally, and using helpful microorganisms like certain bacteria and fungi. These helpful organisms can be used in different ways, like making soil healthier or protecting plants.

The microorganisms colonizing plant roots generally include bacteria, algae, fungi, protozoa and actinomycetes. Enhancement of plant growth and development by application of these microbial populations is well evident. Among different microbial populations present in the rhizosphere, bacteria are the most abundant microorganisms. Various genera of bacteria, Pseudomonas, Enterobacter, Bacillus, Variovorax, Klebsiella, Burkholderia, Azospirillum, Serratia and Azotobacter, cause a pronounced effect on plant growth and are termed as plant growth promoting rhizobacteria (PGPR). PGPR play a significant role in enhancing plant growth and development both under non stress and stress conditions by a number of direct and indirect mechanisms. Microbes exert key functions in ecosystems being involved in nitrogen fixation, phosphorus solubilization, soil formation, and production of siderophores, plant growth regulators and organic acids as well as protection by enzymes like ACC-deaminase, chitinase and glucanase.

Introduction

Livestock sector has been an integral component of Indian agriculture since time immemorial due to its multifarious contributions to the society in the form of nutrient-rich food products, clothing, drought power, income and employment. India has huge population of livestock. Of the total livestock population of the world, India alone has about one-fifth cattle population. As per the 20th livestock census estimate, total livestock population in the year 2019 was over 535 million. Among the livestock products, milk is the most important. India has a glorious history of outstanding achievement in transforming itself from milk deficit country to world’s biggest milk producer over the span of three decades. With over 300 million bovines and producing over 198 million tonnes of milk in 2019-20, the Indian dairy sector exhibits strong growth potential. Despite COVID-19 induced restrictions, which has thrown the smallholder milk producers from the frying pan to fire, the organized dairy sector showed positive growth rate of around 1% in the last f iscal– the lowest in a decade. Despite these proud boasts, poor productivity potential of Indian milch herd is a major cause of concern that may threat its numero one position in future.

The major causes of low milk productivity in India are both intrinsic (low genetic potential) and extrinsic (poor nutrition/feed management). Empirical studies in India have shown that enhancing quality and quantity of feed and fodder has greater impact than breed improvement on increasing milk productivity (Lalwani, 1989; Gaddi and Kunal, 1996; IAEA, 2006; Roy et al., 2020). The timely unavailability of nutritionally rich feed and fodder is a major hitch that impinges on the productivity growth of farm animals in the country. Nonetheless, with increase in agricultural production over the time, the animal feed availability has also improved, but its supply always falls short of the aggregate demand. At national level, the recent reported shortage in green fodder, dry fodder and concentrates is 11.24%, 23.4% and 28.9%, respectively (Roy et al. 2019), and the scenario is more unnerving in few Indian states where the fodder deficit is above 25% (Fig 1).

India has a unique social and cultural setting with diverse people, culture and religions. It is one of the oldest and greatest civilizations of the world. Geographically India extends snow clad Himalayan mountains in the north to the tropical rain forests of the south. It is the 7th largest country in the world and well recognised in Asia by its mountains, seas, deserts, and vast stretch of fertile plain land, which give the country a distinct geographical identity.

India has a very rich, diverse religious and cultural heritage. The four main religions of India are - Hinduism, Islam, Christianity and Sikhism. Hinduism is the largest religion in India, with approximately 80% of the population is Hindu while Islam (Muslim) is the second-largest religion having 14% (approx.) share.

Religion in India is characterised by the diversity of religious beliefs and practices. In Indian history, religion has been an important part of the country's culture. Indian subcontinent is the birthplace of four of the world's major religions, namely, Buddhism, Hinduism, Jainism and Sikhism, which are collectively known as native Indian religions and represent 83% of the total population of India approximately.

Hinduism

Hinduism is the main Indian religion. It is considered as a religious and universal order, a way of life which followed by the people who believed in Hinduism. The word ‘Hindu’ refers group of particular people who believes and follow Hinduism, the oldest religion in the world. It has also been described as ‘Sanatana dharma’.

The Ramayana written by sage Valmiki is one of the great epics of the Sanskrit language. It is most religiously regarded and popular book in Hinduism. The book is believed to be complied between 300 B.C.E. – 200 AD. However, the original story could be as old 500 B.C.E. (Goldman, 1984). There are many other versions of the epic in various regional languages found in India and South Asia (Raghunathan, 1981; Arya,1998; Dutt, 2004; Mukherjee, 2015; Sharma and Arya, 2022).

As per literature references, the name ‘Ramanaya’ is composed of two words, ‘Rama’ and ‘Aya?a’. Rama, the name of the main character of the Epic, has two contextual meanings. In the Atharvaveda, it means 'dark’, dark-coloured, ‘black' and is related to the word ‘ratri’ (night) which means 'darkness of night'. The other meaning, which can be found in the Mahabharata, is 'pleasing’, pleasant, charming, lovely, beautiful. The word ‘Ayana’ means travel or journey. Thus, Ramaya?a means ‘Rama's Journey’ from his kingdom to various places, forests during his life time (Anonymous, 1960; Tulsidas, 1966; Murthy, 2003; Kishore, 2007; Rajagopalachari, 2013).

Ramayana contains over 24,000 couplet verses, in its full form, which are divided into following seven ‘Ka??as’ (booklets) - Balaka??a, Ayodhyaka??a, Ara?yaka??a, Ki?kindhaka??a, Sundaraka??a, Yuddhaka??a, Uttaraka??a and about 500 sargas (chapters). It is regarded as one of the longest epic poems written in history (Keshavadas, 1988; Debroy, 2017; Gupta, 2021).

morally right man in the world? Narada replied that such a man is Rama, son of King Dasharatha of Ayodhya. Valmiki wanted to know more about Rama and proceeded to take bath when he saw two birds in playful mood and was happy. Suddenly, a hunter hiding in the bush shot one of the two birds. Valmiki became painful and chanted some dialogues in curse which ultimately created a new form of sloka. This was the beginning of the main narrative (Goldman, 1984; Sachithanantham, 2004).

The exile of Rama and his journey to the forests (vanvasa) for 14 years was started from Ayodhya (Uttar Pradesh, India) and ended to Lanka (Sri Lanka), through different forests, territorial regions, lands, hills, lakes of old India. The whole journey to those places was candidly portrayed in Ramayana with vivid descriptions, from narrations of the night sky, the position of different stars to descriptions of the flora, fauna and landscape. In this chapter, a retrospection of the places, forests, Rama passed through during his entire journey has been documented. The present status of those forests and places has been considered to evaluate a comparison over the thousands of years and the changes taken place besides significance they hold till date (Anonymous, 2024; Iyer, 2014).

Journey to the Forest and Route Map

Ayodhya, the capital city, kingdom of Kosala, was situated on the banks of holy river Saryu and was the birthplace of Rama. To fulfill the wish of his father, king Dasharatha, Rama left Ayodhya for 14 years of exile to the forest, along with Sita and Lakshmana. Their journey started from Ayodhya and passed through different places / forests.

In this chapter, a comprehensive list of all plants and trees mentioned in epic Ramayana has been furnished with salient details in order to establish their botanical identity and references of Sholka where it had been mentioned. Some of the plants and trees had been mentioned in multiple sholokas but the plant has been taken into account as a single reference to avoid repetition and to get correct count of the trees and plants in whole of the Epic (Amirthalingam, 2013, Arun Kumar, 2019; Balapure et al., 1987; Bast, 2022; Ghimire et.al, 2021; Mao and Dash, 2010; Prasad and Mishra, 1976).

The plant species mentioned in Ramayana were of different types having various usages. Considering their morphological characteristics, usages and other importance, they have been categorized broadly into the following heads.

1. Economically important plants (Timber value, product yielding etc. having commercial importance).

2. Edible (major and minor fruits etc.).

3. Culturally important plants (Plants used for plantation for shade, greening etc.).

4. Non-Edible Plants (Ornamental importance and other usages)

5. Medicinal Plants (having therapeutic uses).

6. Sacred Plants (having religious importance).

7. Others (having multipurpose uses).

In previous Chapter, a list was furnished mentioning common names, botanical names, family and types of the all plants mentioned in the Ramayana. The purpose was to know the total number of plants and trees mentioned besides providing reference of the Shlokas as well. This information led to identification of the plants and trees but details about their morphological and floral characters were not mentioned. Therefore, in this Chapter details of the trees and other plants have been provided. This will help to know all about their botanical standing, conservation status, nativity, morphological and floral characters so that one can know the full details including present-day status, availability and importance (Cowen, 1950; Randhawa, 1983; Roy, 2015; 2024).

1. Botanical Name: Adenanthera pavonina L.

Synonym: Adenanthera gersenii Scheff.

Common Name: ‘Red Bead Tree’, ‘Curly Bean’, ‘Red Sandal Wood’

Family: Fabaceae

Nativity: India, Sri Lanka, Southeast Asia to Queensland

Conservation Status: Common (Not Threatened)

Type: Tree

Morphological and Floral Characters: Red Bead Tree is a timber tree found wild in India. Leaves compound, bipinnate, green when young, turning yellow on maturity. Flowers small, yellowish, grows in a dense, drooping almost cat tail like flower-heads. Fruits curved pods, hanging, green that turn brown, coil up and split open on ripening, showing small bright red seeds which are attractive, used as beads in jewellery.

Retrospection

India is a unique country in the world with many religions and cultural diversity. Indian culture has been continuing through the ages because of its adjustability with others and openness. Unity in diversity is one of the major characteristics of Indian culture. It is a diverse nation where people of many religions live together peacefully. Religion in India is characterized by the diversity of religious beliefs and practices. In Indian history, religion has played an important role in the cultural set up of the country.

Hinduism is the main Indian religion and considered as a universal order, a way of life which is followed by the people. The origin for Hinduism is very old having no exact date of its inception. This is a belief and practices followed by people through the ages and considered as a process of humanity. The earliest known sacred text of Hinduism is ‘Vedas’ which dates back to at least 3000 BCE. However, it is believed that these texts are of divine origin and timeless. Hinduism was more philosophically and theoretically described in Upanishads, written roughly between 800 and 400 BCE. The Mahabharata and Bhagavad-Gita are other best-known book and widely cited on Hinduism. The Ramayana is the other most important epic book on Hinduism which teaches about life, principles, duty, justice etc. through the life-story of Rama.

Dasharatha was a great Hindu king of the Kosala kingdom and Ayodhya was the capital from where He ruled. He was the son of King Aja of Kosala and Queen Indumati of Vidarbha. Dasharatha had three primary queens namely - Kausalya, Sumitra, and Kaikeyi. Unfortunately, the King had no sons to continue his dynasty after him. Despaired Dasharatha summoned Rishyashringa, a forest rishi for a ritual to fulfill his desire of have sons. By that way, the King had four sons. Queen Kaushalya gave birth Rama and similarly, Kaikeyi gave birth Bharata and Sumitra gave birth two sons, namely - Lakshmana and Shatrughna. Lakshmana was very much attached and devoted to Rama while Shatrughna was devoted to Bharata.

General Aspects About Insects

‘Insects’ are almost ubiquitous. They are found all over the world, in the icy regions of the poles, deserts, forests, mountain peaks, oceans and even in oil wells. They can adopt themselves to any climatic conditions and can live in any habitat where food is available. Insects are mostly small, air-breathing organisms of the animal world. Most of the insects live freely in nature. Many species are wild and harmless to human beings. Many are beneficial because of their role in the ecosystem. Some are a part of the food chains of wild creatures, while others through predation and parasitism hold in check many other species of insects. Insects also play a vital role in pollination. Relatively only a few species are harmful to man and are his chief competitor on earth.

The insect body is made up of multicellular tissues. The body is bilaterally symmetrical and is covered by a hard, chitinous exoskeleton. The chitin at the junction of the segments is thinner and pliable and hence insects can bend their bodies. The exoskeleton is made up of several layers of non-living cells produced from the epidermis. Because of the hard chitin us exoskeleton of the body, the growth of the insect is affected beyond a certain extent. So, to facilitate further growth,, this exoskeleton is cast off a few times and this is known as ‘molting’. The number of moultings in a particular species is more or less constant.

Similar to animals of the higher order, insects also possess all important internal systems of organs necessary for the proper performance of the various vital functions. The most important of the systems are the alimentary or digestive system, the circulatory system, the respiratory system, the reproductive system and the excretory system. The fundamental arrangement of the various organs is more or less similar in all insects and does not exhibit much remarkable variations as seen in the external morphological features. The dorsal blood vessel or heart runs along the median line immediately below the dorsal wall. The digestive system including the alimentary canal and its appendages lie in the middle, below the heart. The nervous chain lies below the alimentary canal and immediately above the ventral wall.

Insects generally reproduce by laying eggs or ‘ova’. The initiation of growth inside an egg, which in most cases is preceded by fertilization, leads to a long series of changes, finally attaining the adult stage and in due course to sexual maturity and finally to reproduction of a new generation. This chain of events from the egg stage to adult constitutes the ‘life history’ or ‘life cycle’ of an insect.

Classification of Living Organisms

The classification of living organisms has passed through several changes and has reached the present stage with the gradual assimilation of more and more knowledge about them. The classification is mainly based on the morphology, anatomy, life style, habits, habitats, metamorphosis and such other characteristics. Though the concept of classification of living organisms was perhaps started by Aristotle between 384 - 322 BC, it was the Swedish Scientist Carl Linnaeus (1788), who presented the classification, which was acceptable to most of the Taxonomists. He propounded the binomial nomenclature of naming each and every organism of animal and plant origin with a genetic and species name. In his classification he was consistent in using Latin names for all the organisms.

In today’s times, a lot of innovation has come into agriculture. This very hard occupation requires an amalgation of farmers with the scientists. From the rural areas after education the technocrats are moving to the cities and this is creating a great loss to the agriculturists. As the population is growing so is the demand for food. Due to shortage in the storage systems the amount of wastage has increased a lot. It is an important aspect to be looked into. A lot of waste material is seen in the vegetable markets, city markets and near the slums. This causes a lot of pollution and spoils the environment. It is important to know why is it increasing and why the facilities for wastes do not exist.

After the agricultural activities a number of by-products are obtained and these are known as agricultural waste. These include residues of different crops like stalks, straws, leaves, roots, husks and shells. The animal waste is in the form of manure. All these agricultural wastes are free of cost however; they can be utilized as an important resource (Lionel and Arnold, 1931). Agrawal (1998) has mentioned India as the final dumpyard. The wastes obtained from various resources can be converted into heat, steam, charcoal, methanol, ethanol, biofuel, compost, energy, biogas, construction and high valued chemical compounds. Many times these agri-industrial wastes are not completely utilized and either they rot in open areas or are burned in the fields.

3a. Sources and problems of agricultural wastes
3b. Waste Reduction
3c. Waste Treatment
3d. Waste Disposal
3e. Clean Technology

Different Kinds of Agricultural Wastes
Table 1: Common Hazardous Wastes: Community Source

All these methods of utilization and the conversion to useful energies depend on the climate, population density of the area and the basic infrastructure. It is important to work out the market for the products which are produced.
 
Bio-waste management: It needs to take from small actions to the ambitious ones. European Commission proposes to use wastes which could make up to 25% of total energy consumption by 2020. They propose to have directives for the promotion of renewable electricity (Directive 2001/77/EC) and biofuels (Directive 2003/30/EC). The waste production in Europe has gone upto 2 kg per capita per day. Recycling rates are also rising (European Commission, 2017). The Member states must develop a national action plan and outline the national policies to develop existing biomass resources and mobilise new biomass resources for different uses. A European project has studied the amount of renewable energy to be used in 2020. According to them it will be around 195 million tons of oil equivalents (Mton) of biomass which is biodegradable part of MSW. This will be 20% of renewable energy target. It has also been estimated that the amount of bio-energy from the MSW will be 20 Mton, which would account for around 7% of all renewable energy in 2020. This may be available after composting and anaerobic digestion (Atanasiu, 2010).

The possibility of making genetic changes in the laboratory in plants, animals and microbes used in food started almost 10,000 years ago. Along with natural changes taken place during the evolution totally different species have come into existence. This has helped in increased food production with better taste and nutrition. The losses caused by biotic and abiotic stresses from fungi and bacterial pathogens have reduced.

In the Asian and Pacific ‘region, it is China alone which produces the largest quantities of agricultural waste and also crop residues. This is followed by India. From the production of rice, corn and wheat alone 587 million tons of residues are generated per year in China. Maheshwari (2014) has surveyed the proportions of waste that Malaysia generates from the production of rice, palm oil, rubber, coconut and forest products. In Myanmar the crop waste and residues constitute about 4 million tons per year out of which more than half constitutes rice husk.

1-1. Identify the current state of environmental policies in Indian agriculture and the challenges faced in their effective implementation.

1-2. Evaluate the importance of implementing environmental policies and management systems in Indian agriculture to ensure sustainable development.

1-3. Analyze key international standards, such as ISO 14001 and EMAS, and how they can be applied in the context of Indian agriculture.

1-4. Compare and contrast best practices and case studies of companies and organizations that have successfully implemented environmental policies and management systems in Indian agriculture to draw insights and lessons learnt from them.

According to the Indian economic survey of 2018, more than 50% of the Indian workforce is employed in the agricultural sector. Agriculture contributed to 17–18% to the country’s GDP. Agriculture’s share in India’s economy is less compared to the industrial and services sectors. The industrial and service sectors have higher growth rates. The significance of the agricultural sector in India’s economic and social growth goes well beyond. Nearly 60% of India’s families depend on rural incomes. In addition to this, the majority of India’s poor population (around 70 %) lives in rural areas. Also, as the population is growing at a fast rate, food security in India depends on producing cereal crops and in increasing the production of fruits, vegetables and milk to sustain the needs of a growing population. To achieve this we need a productive, diversified, competitive, and sustainable agricultural sector. India is the world’s largest producer of pulses, spices and milk. It has the world’s largest cattle herd and the largest area under wheat, rice, and cotton. India is also the second largest producer of rice, wheat, cotton, sugarcane, farmed fish, sheep & goat meat, fruit, vegetables and tea.

A. History, Principles, and Scope of Biological Control

Biological Control

Biological control, defined as the use of living organisms to reduce the population of pest species, stands out as one of the most successful, cost effective, and environmentally friendly methods of pest management. This natural process is intrinsic to maintaining ecological balance and supporting the greenery of our planet by enabling plants to produce the necessary biomass to sustain diverse forms of life.

The Essence and Impact of Biological Control

Biological control is an omnipresent force in both natural and human-made ecosystems, constantly active without any human intervention. Its origins trace back over 500 million years with the evolution of the first ecosystems. The process involves naturally occurring reductions in pest populations, which historically, have allowed for the flourishing of plant life critical to the earth’s ecological systems. Without these biological control mechanisms, the amount of energy produced by plants would be a fraction of current levels, drastically reducing the earth’s capacity to support life.

A. Biology, Adaptation, and Host-Seeking Behavior of Predatory and Parasitic Insects

The study of the biological processes, adaptations, and host-seeking behaviors of predatory and parasitic insects is fundamental for enhancing the efficacy of pest management strategies. These aspects are central to leveraging natural predator and parasite behaviors for biological control.

i. Biology of Predatory and Parasitic Insects

The study of the biology of predatory and parasitic insects is a cornerstone in understanding how these organisms function as critical components of biological control programs. These insects play a pivotal role as natural enemies of pest species, with physiological and developmental traits finely tuned for the effective management of pest populations. By examining their complex life cycles, reproductive strategies, and other biological traits, researchers can optimize the use of these insects in integrated pest management (IPM) strategies.

A. Mass Production of Quality Bio-control Agents: Techniques, Formulations, Economics, Field Release/Application, and Evaluation

Biological control agents, such as phytophagous insects, play a significant role in integrated pest management by targeting and suppressing weed populations naturally. Effective utilization of these agents requires understanding their mass production, formulation, economics, field release/application, and evaluation.

Techniques for Mass Production of Bio-control Agents

Mass production of bio-control agents involves rearing insects or other organisms in large quantities while maintaining their effectiveness and quality. The following are key techniques used in mass production:

1. Laboratory Rearing: Laboratory rearing of bio-control agents is a meticulous process that ensures the continuous production of high quality insects under controlled environmental conditions. This technique involves creating optimal conditions for temperature, humidity, and light to simulate natural habitats. Nutritional requirements are met by providing specific diets, which can be natural or artificial, tailored to the needs of the bio-control agents. Breeding protocols are established to manage mating, egg-laying, and larval development cycles efficiently. By controlling these factors, laboratory rearing ensures a stable and sustainable supply of bio-control agents for field application.

A. Successful Biological Control Projects

Biological control, the use of natural enemies to manage pest populations, has seen numerous successful implementations globally for example:

1. Control of Cottony Cushion Scale (Icerya purchasi)

The case of the cottony cushion scale, Icerya purchasi, in California's citrus orchards serves as a seminal example of biological control's efficacy. Originating from Australia, this pest posed a severe threat to the burgeoning citrus industry in California in the late 19th century. The story of its control through the introduction of natural enemies is not only a landmark in biological control history but also a demonstration of ecological problem-solving.

Background and Impact

Icerya purchasi is a sap-sucking insect that infests a wide range of host plants but shows a particular fondness for citrus trees. The infestation is damaging as the scale excretes a sticky substance known as honeydew, which promotes the growth of sooty mold, impairing photosynthesis and weakening the plants. The severity of the infestation threatened the economic viability of the citrus industry in California during the 1880s.

The word “Veterinary” has originated from Latin “veter?n?rius” concerning draught animal and “Medicine” from Middle English, Middle French, Old French and Latin words meaning “healing”. Veterinary medicine is the offshoot of the medicine dealing with the diagnosis, treatment and prevention of diseases/disorders of all animal species including domestic, wild and exotic, companion, draught and pack animals. CONTRIBUTION OF VETERINARY MEDICINE • Reduction in number of cases of tuberculosis and brucellosis in human. • Development of safe and effective vaccines to prevent and control of animal diseases such as Rinderpest, Foot and mouth, Hemorrhagic septicemia, Black quarter,  Pox, Parvo, Distemper,

The concept of health and diseases is essential to veterinary medicine. Understanding    of    such    concepts    provides    the    basis    of    disease    classification. But     these     concepts     are     rarely     given     precise     definition     in     the     textbooks     of veterinary medicine. HEALTH Health is generally considered as absence of the disease. But it is an incomplete definition.    The    concept    of    health    can    be    split    into    five    categories    viz.    health as normality, health as biological function, health as homeostasis, health as physical and psychological wellbeing, and health as productivity including reproduction. Therefore an animal is stated to be healthy only when it is in a complete state of physical, social and mental wellbeing and not

HYPERTHERMIA Hyperthermia is a condition characterized by elevated body temperature due to increased heat production or absorption, or reduced heat loss   owing to physical cause. Etiology • Physical causes such as exposure to high environmental temperature, severe and prolonged physical activity especially in hot humid condition or    animals    confined    with    poor    ventilation. • Spontaneous hemorrhage in hypothalamus can cause neurogenic hyperthermia. • Severe dehydration affects the heat loss by evaporation and thus can lead to hyperthermia. • Too much muscular activity.

MANIFESTATIONS OF GASTROINTESTINAL TRACT DISEASES Diseases of gastro-intestinal tract may be acute or chronic. Dehydration and shock are the major effects of acute and hyper acute diseases of gastrointestinal tract respectively. While major effect of chronic dysfunction of gastrointestinal tract is exhaustion from lack of food and water owing to loss of appetite (anorexia,). Other manifestations of gastro-intestinal tract diseases are abnormalities of prehension, mastication and swallowing; salivation; diarrhea: constipation and tenesmus; ileus; vomiting; hemorrhage; abdominal pain; abdominal distension; and shock and dehydration. Abnormal Prehension • Prehension   abnormalities may arise from paralysis of jaw muscles and tongue, dentition defects, mouth pain

MANIFESTATIONS OF URINARY SYSTEM DISEASES Urinary tract diseases in farm animals  are generally clinically characterized by        pain    and        difficult    urination    (dysuria);    alterations    in    urine    volume    and    its composition; rupture of the renal pelvis, bladder and urethra; and inadequacy of nervous control of urination. Clinical Signs • Dysuria and abdominal pain are common expression of discomfort owing to urinary tract diseases. Acute abdominal pain is rarely seen in cattle due to sudden distension of renal pelvis (pyelonephritis), ureter or renal infarction. Abdominal pain from urethral obstruction leading to distension of urinary bladder is clinically manifested by tail switching, kicking at belly, straining at urination and grunting. Horses with acute tubular nephrosis may show signs of renal colic (arching back, rubbing perineum and tail head). Dysuria (frequent passage of small amounts of urine with pain) is associated with cystitis, vesicle calculus and urethritis • Uremia is commonly seen in cases of acute renal failure and is manifested

Summary

The main greenhouse gases (GHGs) that have caused the global climate change or global warming are carbon dioxide (CO₂), methane (CH₄) and nitrous oxide (N₂O). CO₂ is the principal anthropogenic GHG that affects the earth’s radiative balance. It is the reference gas against which other GHGs are measured and therefore has a Global Warming Potential (GWP) of 1. CH₄ and N₂O have a GWP of 21 and 310, respectively. CO₂ is responsible for most of the enhanced greenhouse effect of more than 50%, CH₄ for about 10-15% and N₂O for about 8%. The global atmospheric concentrations of CO₂, CH₄ and N₂O have increased since 1750. While CO₂ increased from a pre-industrial value of 280 ppm to 379 ppm in 2005, CH₄ increased from 715 ppb to 1774 ppb and N₂O increased from 270 ppb to 319 ppb during the same period. Rich countries and large developing countries account for most of global CO₂ emissions (China 23.5%, USA 18.27%, India 5.83%, Russia 5.72%, Japan 4.04% and European Union 13.98%). A new climate agreement called ‘Warsaw International mechanisms (November 2013) on loss and damage’ agreed to help the poor countries to cope with loss and damage from heatwaves, droughts, floods, typhoons, desertification and rising sea levels. The Warsaw agreement also includes a set of decisions to help developing countries to reduce GHG emissions from deforestation and degradation of forests which is backed by pledges of US$280 million financing by the United States, Norway and the United Kingdom. Projections for global average temperature rise is in the range of 1.1-6.4°C; a doubling of CO₂ (from pre-industrial 280 ppm) and average sea level rise is in the range of 0.18-0.59 m (Meehel et al. 2007) and 0.5–2.4 m (Brown et al. 2013). Hot extremes, heat waves and heavy precipitation events will continue to become more frequent. Projected data show that there is an increasing global trend in the rise of average temperature in all countries, regions or sub-zones; a decreasing trend in average precipitation in most sub-tropical areas and an increasing trend of precipitation in most of the tropical and high latitudes.

Summary

Climate change can affect the quantitative and qualitative status of water resources by altering hydrological cycles, systems and through changes of water quality via chemical and biological contamination. Changes in these variables lead to impacts on all the socio-economic and environmental goods and services that depend on these variables directly or indirectly including water supply, damage to ecosystems, water dependent food production. The most dominant climate drivers for water quantity or water availability are precipitation, run-off and river flows, floods, droughts, snows, glaciers, sea level rise etc. The observed climate change related impacts on world’s water resources/water quantity include increased precipitation at high latitudes and temperate areas and decreasing trends at low latitudes. The annual run-off in some regions may experience increased run-off, such as in high latitudes and large parts of the USA, whereas there has been a decrease in run-off such as parts of West Africa, southern Europe and southernmost of South America. Floods have been the most reported natural disaster events in Africa, Asia and Europe than all other natural disasters and in case of Bangladesh, six extreme floods have occurred in the last two decades. More intense droughts have been reported from Australia, semi-arid and semi-humid regions, western USA and southern Canada, the Sahel. Precipitation is projected to increase at mid- and high latitudes, in the tropics, whereas precipitation is projected to decrease over many sub-tropical areas (North Africa, northern Sahara), tropical Central American (Caribbean) and the Mediterranean. In areas where evaporation rates are expected to increase it would lead to reduced river and stream run-off. In contrast, areas receiving higher precipitation would likely have higher lake and river levels and may experience floods. The annual stream flow in the Murray-Darling basin (Australia) is projected to fall by 10-25% by 2050 and 16-48% by 2100 which would have severe consequences on irrigated agriculture in the region. Rivers depending on the Himalayan glaciers such as the Indus, Ganges, Brahmaputra, Syr Darya and Amu Darya could face water shortages or river run-off due to retreat of glaciers, and this would cause dramatic impact on drinking water supplies, biodiversity, hydropower, industry, agriculture and ecosystems on which about 2.4 billion people in Asia depends. Globally, ground water is the source of one third of all freshwater withdrawals, supplying an estimated 36%, 42% and 27% of the water used for domestic, agricultural and industrial purposes, respectively. The demand for groundwater is likely to increase due to global increase of water use for irrigation and a decline in surface water quality and reduced summer flows in snow-dominated basins. It is projected that climate change (drought, floods) will affect groundwater recharge rates (e.g. floods would increase recharge, drought would decrease recharge).

Summary

Climate change (floods, droughts, rise of temperature and sea level) can directly impact the incidence of water related diseases through effects on water temperature and precipitation frequency and intensity. This chapter focuses on some common water quality related diseases that may enhance due to climate change such as arsenicosis, cholera, cyanobacterial toxins, dengue, diarrhoea and malaria. Arsenicosis is the disease caused by arsenic (As) contamination. As poisoning via groundwater has become a worldwide problem with 21 countries experiencing As groundwater contamination including Bangladesh, India, and China. In Bangladesh, out of 64 districts, As levels in 60 districts have exceeded WHO recommended guidelines of 10 µg/L and in 51 districts it exceeded Bangladesh recommended guidelines of above 50 µg/L. Chronic exposure to As has been linked to carcinogenic effects in both humans and animals. These include cancer of the various skins and internal organs (lung, bladder, liver and kidney) and reproductive and developmental effects; cardiovascular disease; reduced intellectual function in children and mortality. Alternate floods and droughts (due to climate change) have been found associated with the release of As and contamination of groundwater in Bangladesh, therefore may increase the risks of the disease due to rise of extreme events such as floods and droughts. Cholera is a diarrhoeal disease caused by the bacterium Vibrio cholerae. In 2012, WHO reported 245, 3931 cases of cholera in 48 countries, with more than 3,034 deaths with a case-fatality rate (CFR) of 1.2%. The highest cases were from Africa, followed by Latin America and Asia. The epidemic of cholera is reported to be linked strongly with climate change. Changes in temperature, salinity, rainfall and abundance of phytoplankton have been shown to cause an impact on distribution and survival of V. cholerae. In Bangladesh, cholera (cholera-toxin producing strain of V. cholerae) outbreaks are related to plankton blooms and rise of sea temperature.

Summary

Biodiversity (the variety of living things) is fundamental to ecosystem structures and functions, and provide the broad spectrum of goods and services that humans derive from natural systems such as food (e.g. fish), protection from disasters such as cyclones, storms, floods (e.g. mangroves) or maintenance of water quality. Species (biodiversity) respond to climate change either staying or moving out or dying out. For example, the rise of temperature as a consequence of climate change may cause some species to (a) stay in the same environment since they can tolerate to adapt to changes; or (b) may cause some species to move out in a suitable environment (e.g. some species to move pole ward, some up in elevation) or (c) some species (fish) to go deep to increased depths in the oceans to escape heat or warming or (d) may cause some species to die out or get extinct (species with restricted distribution, longer generation time will not be able to migrate or adapt to climate change). A pattern of range shifts such as pole wards and upwards has been documented in hundreds of species of plants and animals and is one of the strongest signals of biotic changes from global warming. These shifts result from two processes: cold-edge expansion and warm-edge contraction. There is now abundant evidence for local extinctions from contractions at the warm edges of species’ ranges or warm edge contraction because the species may have already reached the limits of their climatic tolerance. Investigations conducted reveals that many terrestrial and aquatic species are shifting their geographic ranges in response to rapid changes in temperature and precipitation regimes. For example, many terrestrial organisms are currently shifting in latitude or elevation in response to changing climate. It has been estimated that plants and animals have recently shifted to higher elevations at a median rate of 11.0 m per decade, and to higher latitudes at a median rate of 16.9 km per decade.

Summary

Water security can be defined as reliable availability of water in sufficient quantity and quality to sustain human health, livelihoods, food (agriculture, fisheries and aquaculture) and the environment (biodiversity and ecosystems). Discharge of chemical and biological pollutants (from agriculture, industry and domestic uses) into rivers and development of engineering infrastructure such as dams and weirs over rivers have modified river ecosystems threatening the global water security, water quality and water dependent biodiversity. Climate change (increase in the intensity and frequency of floods, droughts, bushfire and sea-level rise, ocean acidification, etc.) is an additional stress on water security. There is a need to reduce climate change impacts on water security which can be done via adaptations to climate change. Adaptation is adjustment in natural or human systems in response to actual or expected climatic stimuli or their effects, which moderates harm or exploits beneficial opportunities. In other words, the adaptation can be considered as, tackling the effects of climate change. Adaptation to climate change in terms of sustainable use of water may include increasing water availability by developing hydro-basins and transferring water from areas in which it is abundant to areas in which there is scarcity, the reduction of water losses, increasing storage capacity by building reservoirs and dams, rainwater harvesting, improvement of water use efficiency, desalination of seawater, water savings (leakage management, metering, retrofitting existing homes with water efficient products in toilets, showers, baths, using energy efficient dishwashers and washing machines), mandatory rainwater tanks in new and old buildings (for toilet flushing, washing clothes, gardens, car washing), use of recycled or reclaimed water for landscape irrigation or to recharge groundwater aquifers, and to meet commercial and industrial water needs.

1.1 THE IMPORTANCE OF SOILS

Soils are the medium in which crops grow, and so they are essential to the provision of the food and fibre to sustain mankind. But besides the immense importance of this role they are an essential component to life as we know it because of their action as a buffer to control the flow of water between sky, land and sea. They are also a sink, and usually a safe sink, for many of the chemicals that might otherwise make life difficult or unpleasant.

As with other natural resources, it is important that soils are used conservatively, so that the advantages we enjoy from them now can continue to be enjoyed in the future. To do this we need to understand them, to understand the flow of nutrients from soil to plants, and back to the soil or the sea in food chains and water flow. We need to understand the processes by which rocks alter to form soils, and how fast or how slowly the process occurs in different conditions. We need to understand the decay of plant materials in the soil, and how the products of decay help to make the soil a better place for plants to grow.

The chemistry of the constituents of soils, and of the processes by which changes occur, is not simple. Nevertheless we have learnt much about it, and can apply that knowledge to ensure that soils continue their important functions, and are not exploited so that they become infertile, nor used in such a way that the fertile topsoil is lost by erosion by wind or water.

2.1 INTRODUCTION

Textural assessment has long been used to indicate quality in agricultural soil and although it contains an element of subjective judgement, a skilled surveyor can differentiate many grades of texture. Soil texture correlates with the distribution of particle size in the soil, though this is not the only component in texture. Although particle size distribution is an objective attribute of soils and can, in principle, be measured with accuracy, the determination is in practice quite difficult and certainly laborious, so that it is customary in soil mechanical analysis to divide the soil into several broad fractions: sand, silt and clay are the principal categories. The clay fraction, which comprises the smallest particles in the soil, is generally defined as the fraction smaller than a nominal diameter of 2 jam. The practical division is, however, based on the velocity of fall of soil particles through a fluid, calculating the diameter of the particles from the equation of Stokes

3.1 INTRODUCTION

The complete soil organic fraction is made up of live organisms, and their undecomposed, partly decomposed and completely transformed remains. Soil organic matter is the term used to refer more specifically to the non-living components which are a heterogeneous mixture composed largely of products resulting from microbial and chemical transformations of organic debris. These transformations, known collectively as the humification process, give rise to humus, a mixture of substances which have a degree of resistance to further microbial attack.

4.1 INTRODUCTION

It has been suggested that the relationship of surface chemistry to soil science is similar to that of biochemistry to biology. Certainly the fact that surfaces of soil particles are extensive and reactive leads to a dominance of surface chemistry in soil behaviour, but it is not an exclusive relationship, because many precipitation reactions, oxidation and reduction processes, and biological reactions take place more or less independently of the surface processes. Nevertheless it is difficult to understand soil properties fully without an appreciation of the nature and extent of the surfaces of the soil constituents, and this chapter is devoted to a discussion of this topic.

5.1 INTRODUCTION: THE PHYSICAL CHEMISTRY OF COLLOIDAL SUSPENSIONS

This chapter is concerned with understanding the factors which influence the partition of ions between solid surfaces and aqueous solutions. There are many aspects of soil science such as some of those concerned with soil formation, transfer of nutrient ions from soil particles to plant roots, soil pollutant interaction and soil management which are critically dependent on what happens in the space of the order of 1 nm wide between solid and equilibrium solution. A broad survey of the development of ideas on soil-electrolyte interaction shows that there have been two main avenues of approach. One views the soil as an electrically charged surface with its adsorbed hydrated ions as one phase in equilibrium with solution, which is seen as the second phase. The other approach focuses on the electrical double layer extending from the charged solid surface out into the solution. In the latter approach the solid surface, the outer equilibrium solution and the make up of the transition zone between these two phases must all be involved in any detailed consideration of the micro structure of the system. For a full and proper understanding of soil-electrolyte interaction anything less than a detailed analysis of the micro-structure is likely to be inadequate and in this it must be remembered that the interaction between electrical double layers which overlap with one another is likely to be important.

6.1 INTRODUCTION

Water in soils is essential to plant growth, being the medium through which inorganic nutrients are translocated to the root surface and carried through the plant. Most of the water in soils at or near field saturation can be considered as equivalent to bulk water, and only bulk properties need be considered in discussing its movement through soil interstices and its retention in soil capillaries; this is the field with which soil physics deals. But, in the first molecular layer in contact with soil particles, and perhaps for several molecular layers beyond, the behaviour of water molecules is very different from that in the bulk. Strong adsorptive forces can reduce the volatility of these molecules and restrict their mobility. Such an adsorbed layer of water competes with other polar molecules for adsorption sites, and so has an important role in determining the release and retention of fertilizers and pesticides. Such strongly adsorbed layers confer wettability on soils, but hydrophobic surfaces can also be present and these lead to non-wettable soils with serious consequences in run off and inefficient use of precipitation. This region of distinctive molecular interactions between water and soil particles falls within the field of soil chemistry.