eChapters

6.1 INTRODUCTION

The Climate and soil play important role in growth and development of the plant. Growers in general and fruit growers in particular should have adequate knowledge of the effect of various soil and climatic conditions on raising horticultural crops. Horticultural crops cannot be grown in all types of soil and climate. Hence zone- wise cultivation is made. Climate includes a number of parameters like temperature, rainfall, atmospheric humidity, wind, hail and light whereas soil covers factors like moisture content, texture, soil reaction, nutrient content, chemical composition and soil temperature.

6.2 SOIL

Soil is a thin outer covering of the earth surface. It is the natural resource directly developed by different natural forces acting on natural materials. Soil serves as a base and support for plant growth. It is a basic medium for plant growth and supplies nutrients for growing plants. Soil is the home of the plant root and the reservoir for essential nutrients and water for growth and development of crop plants.

19.1 Introduction

Fish are the most common aquatic vertebrates. Fishes’ primary aquatic adaptation is the presence of gills. They use the oxygen that remains dissolved within the water via their gills. The gills use up to 80% of the oxygen dissolved in the water that passes over them. In addition to the gills, skin, the air bladder and accessory respiratory organs perform gas exchange functions in some fishes.

Fish gills are essentially the same. The gills have been specially modified to use up to 80% of the oxygen dissolved in the water that passes over them. Cyprinus and Carassius gills excrete six to ten times more nitrogenous waste than kidneys.

Fungal and parasitic infections represent major health challenges in Indian aquaculture, impacting both freshwater and marine systems across diverse climatic regions. These pathogens significantly affect fish health and productivity, often causing substantial losses in high-density farming systems. Their complex life cycles and often nonspecific clinical symptoms make diagnosis and control particularly difficult. Effective detection, timely treatment, and preventive biosecurity are essential to maintaining sustainable aquaculture practices in India.
Fungal pathogens such as Saprolegnia, Achlya, and Branchiomyces are commonly encountered in Indian aquaculture. These opportunistic fungi typically infect fish weakened by environmental stress, physical injury, or concurrent bacterial infections. Among these, Saprolegnia spp. are most frequently implicated, especially in carps, catfishes, and ornamental fish. Infected fish often display white or greyish cotton-like growths on the skin, gills, or eggs.
Field-level identification relies on observation of external lesions, erratic behavior, and increased mortality. Microscopic examination of skin scrapes or gill biopsies mounted in saline or potassium hydroxide (KOH) can reveal fungal hyphae, which are long, filamentous, and typically non-septate or sparsely septate.
Fungal cultures are grown on Sabouraud Dextrose Agar (SDA) or Potato Dextrose Agar (PDA), often supplemented with antibiotics to suppress bacterial contamination. Incubation at 25–30°C allows colonies to develop, which can be characterized by morphological and microscopic traits. Molecular diagnostics, including PCR targeting fungal ITS regions, are increasingly utilized in advanced laboratories such as ICAR institutes and state fisheries departments.

10.1 INTRODUCTION

Most botanists identify trees by their leaves, f lowers and fruit. However, the plant architecture specialist is interested in trunks, branches and twigs. All types of fruit tree do not require pruning, e.g., mango, sapota, while some fruit trees can grow well naturally, e.g., pineapple, papaya as they do not require pruning. Most deciduous trees like apple, pear, almond etc. and grapes, ber, fig, citrus, pomegranate, guava etc. require pruning to train them for desired shape.

10.2 TRAINING

Training is an operation by which the plant is made to develop an orderly structure or frame work. This is done by staking, tying, supporting, propping, trailing or spreading on certain structure with or without pruning of plant. Training is usually done when plants are young. Bending, twisting, decapitations are done by using springs of hard wire, where it is required. It is a physical technique which controls the shape, size and direction of plant growth known as training or in other words, training in effect is orientation of plant in space through techniques like tying, fastening, staking, supporting over a trellis or pergola in a certain fashion or pruning of some parts.

21.1 Introduction

The air (=gas or swim) bladder, also known as the fish maw, is a tough sac-like structure with an overlying capillary network. It develops as an outgrowth from the oesophageal region and is found in bony fish. It demonstrates a wide range of development, structure, and function in various fish. It is usually a hydrostatic organ that controls buoyancy, allowing the body to remain at the current water depth without having to expend energy swimming. It is similar to a diver’s buoyancy compensation device (BCD). It also serves as a resonating chamber for producing or receiving sound and is used as an air-breathing organ.

Histopathology is a critical diagnostic method used to examine tissue structure and detect pathological changes caused by infectious agents in fish. In India’s rapidly growing aquaculture sector—encompassing economically significant species such as rohu, catla, tilapia, pangasius, and ornamental fish— histopathology plays a pivotal role in disease surveillance, diagnosis, and research.
As fish farming intensifies across major aquaculture states like Andhra Pradesh, West Bengal, Tamil Nadu, and Kerala, advanced diagnostic techniques like histopathology are becoming increasingly important. These techniques enable early detection of diseases and support efforts in biosecurity and sustainable fish farming.
The process begins with the careful collection of tissues from fish suspected of disease. Key organs examined include gills, liver, kidney, spleen, heart, intestine, and muscle, which are commonly affected in systemic infections of bacterial, viral, parasitic, or fungal origin. Fish samples are collected from ponds, tanks, cages, or RAS units and transported under chilled conditions—preferably on ice—to laboratories such as ICAR-CIFE, state fisheries universities, or certified private centers.
Tissue dissection is conducted under aseptic conditions. Samples are immediately fixed in 10% neutral buffered formalin, the most commonly used fixative in India, to prevent autolysis and maintain cellular architecture. Fixation typically takes 24–48 hours, depending on tissue size and thickness.
After fixation, tissues are processed through graded alcohol dehydration, clearing in xylene (or substitutes), and embedding in paraffin wax. These steps are often performed using automated tissue processors available in regional laboratories. Once embedded, tissues are sectioned at 4–6 microns using a rotary microtome and mounted on clean slides.

Cytological and wet mount techniques are essential diagnostic tools in Indian aquaculture, especially in regions with limited access to advanced laboratory infrastructure. These methods offer rapid, cost-effective, and straightforward approaches for identifying fish pathogens, making them highly suitable for both field and laboratory use.
Cytology involves the collection of cells from various fish tissues—such as gills, skin, fins, kidney, liver, and other internal organs—which are then smeared onto clean glass slides. The smears are air-dried, stained, and examined under a microscope to detect cellular abnormalities, inflammatory responses, or the presence of infectious agents.
• Common stains used in Indian labs include Giemsa, Leishman, and Wright’s, which effectively highlight the morphology of erythrocytes, leukocytes, and abnormal cells.
• Cytology can reveal conditions such as anemia, inflammation, and bacterial or fungal infections, particularly those caused by pathogens like Aeromonas or Edwardsiella.
• Swabs from liver or kidney are frequently used to observe inclusion bodies and aberrant cell structures that suggest systemic infections.
Wet mounts involve placing fresh samples—such as mucus, gill biopsies, skin scrapings, or fecal material—on a slide with a drop of saline or water, covered by a coverslip. These are examined under light microscopy to detect motile parasites and other abnormalities in real time.

Principle

Good documentation constitutes an essential part of the quality assurance system. Clearly written documentation prevents errors from spoken communication and permits tracing of batch history. Specifications, Manufacturing Formulae and instructions, procedures, and records must be free from errors and available in writing. The legibility of documents is of paramount importance.

General

Specifications describe in detail the requirements with which the products or materials used or obtained during manufacture have to conform. They serve as a basis for quality evaluation. Manufacturing Formulae, Processing and Packaging Instructions state all the starting materials used and lay down all processing and packaging operations.

Procedures give directions for performing certain operations e.g. cleaning, clothing, environmental control, sampling, testing, and equipment operations.

Records provide a history of each batch of product, including its distribution, and also of all other relevant circumstances pertinent for the quality of the final product.

Agricultural scientists and policy makers have understood that continuation of modern agriculture might lead to severe ecological and economic problems. We are also convinced that modern agriculture may not be able to meet the requirements of the ever increasing population in the future. So, we are searching for alternative technologies. Several alternatives have been proposed such as low external input agriculture, sustainable agriculture, organic farming, biodynamic farming etc. However, they require, some times little or considerable external inputs whose availability may be uncertain in future.

Hence for the developing countries, the other alternative viz., traditional methods have special advantages over modern agricultural techniques. Also the capital and technological skill requirements in the use of traditional technologies are generally low and their adoption often requires little restructure of the traditional societies. The traditional technologies are nothing but indigenous technical knowledge. By adopting such indigenous knowledge, our ancestors did not face any problem of large-scale pest out break or economic crisis unlike the today’s farmers.

5.1 Definitions

The erodibility of soil is its vulnerability or susceptibility to erosion, that is the reciprocal of its resistance to erosion. A soil with a high erodibility will suffer more erosion than a soil with low erodibility if both are exposed to the same rainfall. Whereas the erosivity of rainfall was shown in chapter 4 to be a fairly straightforward measure of the rain’s physical properties, the assessment of erodibility is more complicated because it depends upon many variables. There are alternative uses of the term erodibility. In the widest sense it can be used to include all the variables which effect erosion except the erosivity of rain, as in the first line of figure 2.2. It is also used in the narrower sense as a measure only of the effect of physical characteristics of the soil, as in the erodibility index K of the Universal Soil Loss Equation, where the effects of land management and crop management are assessed separately, as shown in the last line of figure 2.2.

5.2 Factors influencing erodibility

In this chapter we will look at the three broad groups of factors which affect erodibility. First, there are the physical features of the soil, including the chemical and physical composition. Second, there are the topographic features, such as the slope of the land. Third, there is the management of the land, i.e. how it is used.

1. Chlorophylls

Chlorophyll can be regarded as a true representation of health of green plants. This presumption is based on the fact that chlorophyll is most commonly and immensely influenced by biotic and abiotic stress conditions in addition to events like pathogenic invasion, pollution, mineral deficiencies as well as mineral toxicity. This is the reason that estimation of chlorophyll is considered to be one of the most important parameters in plant physiological studies.

Eukaryotic plant cells possess many types of ‘reserves’, one of them is plastid. A plastid, that contains green colour is known as chloroplast and the green colouration of a chloroplast is mainly due to the presence of a pigment to which we call as chlorophyll. Normally, chlorophyll constitutes about 4% of chloroplast dry weight.

Chlorophyll ‘a’ and ‘b’ are the most abundantly found in all autotrophic higher plants. However, there are other chlorophylls also such as ‘c’, ‘d’, ‘e’, bacteriochlorophyll and bacterioviridin which have restricted presence in blue-green, brown and red algae.

A chlorophyll molecule contains ‘Tetrapyrrole’ skeleton formed into a ring with an atom of magnesium (Mg⁺⁺) in the centre. A so-called ‘Pyrrole’ molecule contains four carbon and one nitrogen atoms arranged in a ring. Four such pyrrols arranged in a ring form the ‘Head’ of chlorophyll molecule. Attached to this is ‘porphyrin ring’, at one point, is a ‘phytol’ tail- a long chain of linked carbon.

1.1 Weather

Firstly, what is weather? Simply, the conditions in the atmosphere above the earth is called weather. It refers to the conditions such as wind, rain and temperature, prevailing at a particular location during periods of hours or days. We often ask “what’s the weather like today”? Any individual can answer to this question as it requires only a short term experience or say exposure to the atmosphere. The TV news forecasters predict weather each day and inform about the temperature, cloudiness, humidity, or possibility of storm in the next few days. Weather is localised, say, it’s a hot and cloudy weather in one part of the country and dry and windy on the other part.

1.1.1 What are the factors that influence weather?

Before we try to understand the factors that influence weather, we must understand what the components that describe a weather conditions are? Is it the rains, or the air temperature or both? The answer to this question is not so easy, and it’s a bit complicated. There are many components that constitute weather. Weather components include rain, cloud cover, sunshine, winds, hail, snow, sleet, storms, thunderstorms, heat waves and many more. These components are sometimes referred as weather parameters or climate elements. Each of these components define weather patterns of a particular area. These components determine the status of local atmospheric conditions. Again, as a basic definition, weather is the state of the atmosphere and majority of weather phenomena occur in the lowest layer of the atmosphere, called as the troposphere. Does it mean that ground conditions such as the topography, water bodies and vegetation of a particular area has nothing to do with it? No, it is not so. The state of the atmosphere is subjected to various processes taking place not only in the atmosphere but also in the ocean, the sea-ice, the vegetation, etc. Weather parameters or the components of weather form a sequence of events, and the influences are far reaching and they do not remain solely in the atmosphere. For example, terrestrial radiation impacts the air temperature, air pressure and humidity. The terrestrial location also influences the cloud formation. The clouds may or may not turn into precipitation depending on the outcome (cloud or rain), which is by and large governed by troposphere. Likewise, a lack of precipitation affects not only weather conditions, but also soil moisture conditions that may result in lowering of water levels (ground water table) in soil. Wind speed and direction are governed by the atmospheric pressure and air temperature. So, all these parameters or components are interrelated and the weather conditions are the outcome of their interactions. Therefore, we can say that, the three main components of weather are temperature, precipitation and solar radiation. These components are influenced by different factors.

Climate change is caused by both natural as well as anthropogenic causes and it has been changing since the inception of earth-atmosphere (Figure 2.1). In a broader sense, anthropogenic activities (human activities) also must be considered as natural one in longer time scale as human and their activities are also a part of natural-ecosystem-functions. Among the natural phenomena, volcanic eruptions and continental drifts significantly affect the earth’s precipitation and temperature. A huge volume of CO₂ is released due to volcanic eruption at a little span of time-period which heated up the earth-atmosphere. Climate variability is primarily governed by rise in sea temperature, movement of warm water from the Western Pacific towards Peru, and El Nino which occurs at an intervals of 3-7 years. Climate variability also influenced the alteration in temperature and precipitation world wide. And persistent climate variability cause long term climate change. Therefore, basically three drivers that causes climate change are, the alteration in the energy of sun received by earth-atmosphere (natural causes), variations of ref lectivity of earth-surface- atmosphere system (natural as well as anthropogenic causes) and fluctuations in the greenhouse effect (natural as well as anthropogenic causes).

The environmental needs for rearing fish and shellfish seed center on ensuring ideal conditions that support their growth and survival. Key elements include maintaining proper water quality, temperature, oxygen levels, and feeding routines, all of which differ based on the species and their developmental stage. Rearing systems may vary from controlled indoor tanks to open outdoor ponds, each offering unique benefits and challenges.
ROLE OF TEMPERATURE, LIGHT, DISSOLVED OXYGEN, PH, SALINITY
The development, growth, and survival of fish and shellfish are strongly influenced by environmental factors. In aquaculture and hatchery practices, careful control of parameters such as temperature, light, dissolved oxygen, pH, and salinity is essential to ensure the healthy rearing of aquatic species. These factors directly affect metabolism, reproduction, molting, immunity, osmoregulation, and larval development. Water Temperature Water temperature plays an important role on the life history of shellfish in determining their biological reaction. Shellfish have a range of water temperature in which they function best. Outside this range, they do not function as well.

1. Introduction

India has diverse agro-climatic conditions which, widely promote the cultivation of different types of fruit crop. A wide variety of fruit crops are grown across the country such as banana, mango, citrus, papaya, guava, grapes, pomegranate, apple etc. Globally, we rank second in fruit production after China. The total area under fruit crops is 66.64 lakh ha with a production of 99.06 million Mt (Anon., 2018). However, the average productivity (13.03 t/ha) in fruit crops is quite low than other countries. Further, the per capita fruits availability in our country is 207.9 g/ day which is below than the recommended quantity of 230 g/capita/day (Anon., 2018). 

42.1 Introduction

Several fish species including their seeds, eggs and spores have been imported either occasionally or artificially and introduced into the water of our nation. These fishes are not native to our country and are called exotic fishes. Based on utility, these fishes include food fishes, game fishes and larvicidal fishes. In other words, the fish species that are not of Indian origin but transplanted into Indian water for cultural purposes are called exotic fishes. Exotic fish are an alien species that are non-indigenous having their origin in another country

Game: A species of wildlife hunted or trapped by humans, including upland birds, waterfowl, small game, forbearing, and larger mammals that are within the purview of management.

Gamete: i) A mature sex cell, such as sperm/egg used in fertilization. A reproductive cell whose nucleus and often cytoplasm fuses with that of another gamete during fertilization resulting in the formation of a zygote. Gametes are usually differentiated into male and female gametes. ii)  A male or female reproductive cell, typically the product of meiosis, capable of uniting in the process of fertilization with one of the opposite sex.

Training: The Concept

For any kind ofdevelopment, resource is the basic condition and necessity. Every resource should undergo a process of refinement, up gradation, and integration for being able to contribute to a proper functioning and accomplishment. No exception to human resources, the most splendid and creative resource of the earth. While human resources are unique? The following are the reason:

(a) It can think and create

(b) It can integrate and coordinate

(c) It can ideate and communication

(d) It can support and sustain

1. Introduction

A lawn is an indispensable feature of a landscape with a sizeable proportion of space relative to other garden features. It is regarded as the heart of a garden that enhances the beauty of a landscape providing both functional and aesthetic utility. A well maintained lawn at a residential, public or institutional places can be used both for active and passive recreation. It enhance the beauty of surroundings and contribute to real estate value. The turf industry is being viewed as an integrated sector of ornamental horticulture in the developed countries like USA, Australia, China, Netherland, UK, Japan and Denmark. Globally, the turf grass industry has employed skilled workforce for maintaining more than 700,000 athletic fields and over 17,000 golf courses, with an annual worth of $ 20 million each year (Aldous and Chivers, 2002).

Iron (Fe), zinc (Zn), copper (Cu), manganese (Mn), nickel (Ni), boron (B), molybdenum (Mo) and chloride (Cl) elements are known as micronutrients. The micronutrients are also called as trace elements or minor elements as they are required very small quantities by plants. The elements Fe, Zn, Cu, Mn and Ni are known as micronutrient cations and B, Mo and Cl are known as micronutrient anions and they behave accordingly in soils. Among these elements, Fe content in soil as well as plant is the highest and sometimes higher than phosphorus (P) and sulphur (S). In plant, the concentration of micronutrients often found up to 100 mg kg^-1, except that of Fe and Mn which may go up to 500 mg kg^-1 (dry weight basis). Another element, cobalt (Co) is also regarded to be essential for the growth of certain higher plants and animals, and likely to be included in the list of micronutrients. The importance of micronutrients has been realized during the past four decades when micronutrient deficiencies were observed in most of the soils in our country, where intensive agriculture is practiced.