eChapters

Meteorology is not merely the study of weather patterns; it is a critical science that intersects agriculture and allied sectors in numerous ways. In a world where food security is intimately tied to climatic variability, understanding the basic principles of meteorology is essential for both traditional farming practices and modern integrated food production systems. This chapter explores the foundational concepts of weather and climate, examines the atmospheric dynamics that directly impact agricultural systems, and contrasts historical meteorological practices with modern forecasting approaches. By delving into these topics, we can better appreciate how the environment influences agricultural productivity and how innovative meteorological tools can improve decision-making in the food production chain. Weather describes the state of the atmosphere at a specific time and place. It is the sum of short-term atmospheric conditions such as temperature, humidity, precipitation, wind, and visibility. In contrast, climate refers to the long-term average of weather patterns over a period of decades or more. Understanding this distinction is crucial for agriculture, as farmers and allied sector professionals must respond to immediate weather events (such as sudden frost or heavy rainfall) while also adapting to long-term climatic trends (like gradual temperature increases or shifting precipitation patterns).

Meteorological hazards are severe and extreme weather and climate events that occur in all parts of the world, although some regions are more vulnerable to certain hazards than others. Meteorological hazards include cyclones, droughts, floods, hurricanes, hailstorms, heat waves and tornadoes. The hazard is distinguished from an extreme event and a disaster. An extreme event is simply an unusual event; it does not necessarily cause harm. A disaster is an event that does cause harm in significant amounts. Meteorological hazards are often called as natural hazards. The natural hazards become natural disasters when people’s lives and livelihoods are destroyed.

Hydrological hazards are the result of either excess or a severe lack of water, i.e., flood or drought. Hydrometeorological hazard is a process or phenomenon of atmospheric, hydrological or oceanographic nature that may cause loss of life, injury or other health impacts, property damage, loss of livelihoods and services, social and economic disruption, or environmental damage. Human and material losses caused by natural disasters are a major obstacle to sustainable development. By issuing accurate forecasts and warnings in a form that is readily understood and by educating people about how to prepare against such hazards, before they become disasters, lives and property can be protected.

Atmosphere serves as the medium through which pollutants are transported and dispersed. While being transported, the pollutants undergo chemical reactions, which may be lethal or scavenged by chemical or physical process/method. But it all exclusively depends upon the meteorological conditions (Lee et .al, 1994). Historic air pollution episodes reveal that atmospheric conditions influence the pollutant concentrations as well as their toxicity (Goldsmith & Friberg, 1976; Wichmann et.al, 1989 and Pope et.al, 1992). However, the location, duration of release, height as well as the pollutant concentrations are also important, which effect the secondary pollutant transformation under the influence of meteorological conditions, but the atmospheric behavior is independent of their sources (Holzworth, 1974).

Abstract

Agroforestry is an integrated self-sustainable land use management system that is not only capable of producing food from marginal agricultural land but also capable of maintaining and improving the quality of environment. It plays a vital role in achieving integrated rural and urban development. But reliable data on number of trees and area under agroforestry is not available as methodology for estimation of even area under agroforestry is not yet standardized. In this paper, a methodology for estimation of number of trees under agroforestry using high resolution satellite data has been proposed and estimation of number of trees as well as area under agroforestry in Ludhiana district of Punjab State has been done using the proposed methodology. Land use/land cover map of the district has also been generated using ERDAS IMAGINE software. It has been observed from the accuracy assessment that the estimates of number of trees as well as area under agroforestry obtained using the proposed methodology under this study are very reliable. Therefore, the proposed methodology may be replicated for estimating number of trees as well as area under agroforestry in other parts of the country.

Keywords: Agroforestry; Estimation of number of trees, Area estimation; Remote Sensing; GIS

Nowadays, revolutionary changes in entire globe have led to the economic, cultural and scientific development in our society and have augmented considerable changes in our food habits and life-style. Continuously growing population had noticeably increased the pressure on land, water and energy resources. All these resources are scarce and going to be exhausted in coming decades at the present rate of consumption. Undoubtedly, production of food is more imperative than the production of energy or any other bioproducts. Moreover, with the world population rising to 9 Billion in 2050, with many inspiring to a western life style and diet, this challenge should be addressed urgently (Draismaa et al., 2013). The challenge to produce about 70% more food by 2050 for a growing and increasingly affluent world population has motivated several review papers addressing the different dimensions of the food system and food security (Verburg et al., 2013). Presently, human beings consume approximately 2.5 billion tons of dry weight of harvested crops which include approximately 2.3 billion tons of cereals (e.g., rice, wheat, and corn kernels) and grass from managed pastures (Smil, 2000).

1. Introduction
Pharmaceutical pollution has emerged as a significant global concern, raising alarms about its potential impacts on ecosystems and human health. The journey of pharmaceutical compounds from their point of use to contamination of water bodies reveals a complex and interconnected web of anthropogenic activities. From manufacturing plants to individual households, these pollutants persistently infiltrate aquatic systems, creating a growing

The basic methods for wastewater sewerage (collection, treatment, and disposal) are as follows:

• Off-site sewerage
• Separate sewerage system
• Combined sewerage system
• On-site sewerage

Many nations have implemented separate sewage systems that transmit sewage and storm water through separate pipelines in order to separate the two. Storm water often does not contribute to a wastewater treatment facility (WWTP). Domestic sewage contains 99.9% or more water. The remaining portion is made up of bacteria

Life on Earth is dependent on microorganisms for many essential services. Microbes are intimate partners in global agriculture by way of mobilization of nutrients, antagonism against pathogens and exploitation of plant- microbe interactions and optimization of plant microbiome allows farmers to apply less chemical fertilizers and pesticides, and improving plant growth and yield for sustainable development.

India has 2.4% of land area of world and 8.1% global species diversity. India has 7500 km long coast line in nine states and three union territories. About 14% of Indian population (17 crores) lives in coastal area. In 10.78 million ha of coastal ecosystem, rice is the major coastal crop. Coastal rice accounts for 15% of total area and production of India. Coconut, cashew, areca nut, spices, plantation and fruit crops are the other important coastal crops. The east coast in four states (Tamil nadu, Andhra Pradesh, Orissa, West Bengal) and one union territory (Pondicherry) has sandy coast and plains with medium to high rainfall (100-250 cm), and hot humid climate. It has marshy lands and mangroves. The west coast in five states (Kerala, Karnataka, Goa, Maharashtra, Gujarat) and two union territories (Diu and Daman, Dadar and Nagarhaeli) has fertile sandy plains with high rainfall (250-300 cm) and hot humid climate suitable for horticulture and plantation crops. Western Ghats near west coast is a hot spot with high biodiversity. ICAR established the Central Coastal Agriculture Research Institute (CCARI) at Goa in 2015 to carry out research on coastal agricultural crops.

Soil salinity in coastal regions is not only a soil type character, but also due to low quality irrigation water. The plant associated microorganisms “Plant microbiome” play a significant role in conferring resistance to soil salinity. The endophytic bacteria- rhizobium, rhizobacteria- azospirillum, azotobacter, phosphobacteria, PGPR bacteria, cyanobacteria, symbiotic fungi- ecto and endo mycorrhiza, alleviate the impact of soil salinity. Minimal microbiome for plants is the key determinant of plant health and productivity. The plant- microbe interactions are of three types: (i) Positive: Beneficial organisms- nitrogen fixers, phosphobacteria, mycorrhiza; (ii) Negative: Harmful organisms - plant pathogens; (iii) Neutral: Transient organisms. Millions of microbes inhabit plants, form complex ecological communities to improve plant growth, crop quality and productivity.

A farm microclimate refers to the specific climatic conditions of a small, localized area within a farm. These conditions can differ significantly from the broader regional climate due to various natural and man-made factors. Understanding and managing microclimates is crucial for optimizing crop growth, animal welfare, and overall farm productivity. Modern commercial dairy production requires a special approach to the microclimate on the farm. High quality milk and animal health depend on the conditions of their keeping. At the same time, farm for dairy production for the most part do not have the means to control and manage the microclimate, in contrast to poultry farm. When organizing the correct process of controlling the microclimate, a prerequisite is the presence of an automated system for collecting data. Generally animals adapt to a wide range of weather conditions although their growth and productivity varies with weather conditions. Buffaloes and cows form the main component in dairy industry. The extent to which these animals can adapt to different weather conditions is given below: Successful management of buffalo rearing will be incomplete without wellplanned and adequate housing facilities (Fig.10.1).
Improper planning in the arrangement of animal housing may result in management problems, increase in disease incidence, additional labour charges and hence decrease in the profit of the farmer. During erection of a house for dairy buffaloes, care should be taken to provide comfortable accommodation for individual animals. It is important to ensure:
• Proper sanitation
• Durability
• Abundant supply of clean water
• Arrangements for the production of clean milk under convenient and
economic conditions.
Buffaloes may be successfully housed under a wide variety of conditions, ranging from close confinement to little restrictions except at milking time. However, two types of farms are in general use.

Change in weather affects growth and development of plants. The extent of these effects depends upon the range or severity of change of weather. It is very much possible to change the weather in relatively small area to reap better harvest. Micro weather modification is defined as, “The manipulation of weather elements at increasing or decreasing the duration, intensity, quality etc., for desired effects at microlevel of crop under investigation”.

The climate near the ground can be managed partly by influencing the moisture status and temperature of the upper soil layers, e.g. by mulching and partly by action above the ground e.g. by shading or use of wind breaks.

There is an increased use of Glass houses and poly houses in commercial agriculture. The glass houses and poly houses provide a controlled environment for plants throughout the year. Some of the aspects of related to the advantages of Glass houses and poly houses are highlighted in the following text:
9.1. Glass houses
Glass houses are also referred as greenhouses. The glass prevents harmful ultraviolet radiations. The glass is transparent to solar radiations of wavelengths up to 300 nm and does not allow long-wave radiations to pass through it (Fig.9.1). Therefore, the Glass houses maintain higher temperature and high relative humidity during daytime as well as nighttime and offer the following advantages:
9.1.1. Controlled Environment: Glass houses facilitate regulation of temperature,
humidity, and light intensity, creating optimum environment for growing various plant species. This is especially beneficial for tropical and sub-tropical plants that require specific conditions to grow and survive.
9.1.2. Protection from Pests and Diseases: The enclosed glass house protects
plants from pests and diseases. The glass house also protects the plants from harsh weather conditions thereby minimizing risk of infestations and environmental stresses. Fig. 9.1: Microclimate management in Glass house
9.1.3. Extended Growing Season: By maintaining stable climate, glass houses
enable cultivation of plants that may not survive outdoors in certain climates thereby extending the growing season for sensitive species.
9.1.4. Research and Conservation: Botanical gardens often use glass houses for
research purposes, studying plant growth, genetics and breeding. The glass houses will also serve as a means for conserving rare or endangered plant species by providing stable environment for propagation. The advantage of glass houses is that the structure has long life span.
9.2. Poly houses
The poly houses are constructed using polythene material. The poly houses protect the plants from wind, cold weather, hail storms, extreme temperatures, insects and pests. The polythene house farming is a popular greenhouse technology due to its low cost of construction and maintenance. Generally, heat accumulation (70 to 75 per cent of solar energy) takes place inside the polyhouse. Solar radiation is allowed to pass through the polythene material and the long wave radiation cannot escape through polythene. The benefits of poly houses are:

There is growing demand for increasing fruit production as fruits are considered to be healthy, nutritious and easy to digest. Fruits are natural foods and have export potential as well as provide opportunities for increasing employment by establishing fruit processing industries. Some of the fruits can be grown around the year where as some fruits are of seasonal in nature. Usually, the fruit cultivation is undertaken by establishing orchards. In case of orchards, wrong decisions in planting may result in huge loss and therefore right method of planting is the key factor for establishing orchards.
The fruit crops are of three types depending on the adoptability to the climate of the region and are grouped as
• tropical fruits
• sub-tropical fruits
• temperate fruits
The microclimate of the orchards depends upon
• height of the plants/trees
• horizontal spread
• canopy architecture
• spacing/plant density
• age of plantation
• seasonal weather
15.1. Tropical Fruits
The tropical fruits require higher temperature throughout the year. The crops do not require low temperature for breaking dormancy and for flowering. The plants are ever green and grow throughout the year. There plants are well adopted to regions where the minimum temperatures are more than 10°C and very sensitive to frost. There are grown in tropical regions between 23°N to 23°S latitudes. The optimum maximum temperature for growth and development ranges from 30 to 37°C.
15.2. Sub-Tropical Fruits
The sub-tropical fruits perform better between temperate and tropical climates as the plant requires both high and low temperatures. Some of the fruit crops are green and some of those are deciduous. The temperate fruit crops are very sensitive to frost. The sub-tropical fruit plants break dormancy of flower buds

Microclimate under irrigated conditions and dryland conditions can differ significantly due to variations in water availability, which influences several environmental parameters such as temperature, humidity, soil moisture, and vegetation cover. The crops are grown both under irrigated and dryland / rainfed situations. The major difference between irrigated and dryland conditions is availability of water. In irrigated areas, the crops are regularly provided with water through irrigation at regular intervals. Under dryland situations, the water availability to the crops depends upon the rainfall and/or stored soil moisture. Under irrigated situations, there are two different possibilities as indicated below:
• vast stretch of irrigated areas
• isolated pockets of irrigated areas in predominantly dry areas. In dryland areas the following possibilities exist:
• humid and moist sub-humid areas where predominantly rice based cropping systems are adopted during rainy season
• per-humid areas where plantation crops and rice grown during rainy season.
• dry sub-humid areas with rice based cropping systems in low lands and finger millet, maize based cropping systems in upland areas
• semi-arid regions where kharif crops are grown during rainy season.
• rabi-crops grown under conserved moisture conditions during post rainy season.
• arid regions where pearl millet based cropping system are practiced during rainy season.
• hill agriculture
The microclimatic conditions are likely to vary between irrigated and rainfed conditions due to different agro-ecological settings. The comparative analyses of microclimatic variation under both conditions are given below:

Modifying microclimates in agriculture involves altering the local climate conditions surrounding crops or plants to create a more favorable environment for growth. This can be achieved through various techniques when the crops are subjected to weather related stresses.
14.1. To Mitigate Moisture Stress during Droughts
When the crops are under moisture stress, the principles involved are conservation of soil moisture and reduce the evapotranspiration from crops. The moisture conservation can be achieved by suppressing soil evaporation using mulches (Fig. 14.1). The evapotranspiration can be reduced using anti transpirants. These are chemicals sprayed on crops. Some antitranspirents close the stomata of the leaves to reduce evapotranspiration. Some chemicals increase the reflectance of radiation from the crops, thereby reducing heat load on crops. When crops are grown under irrigation in isolated patches, micro shelter belts can be provided across the predominant wind direction to reduce the increased evapotranspiration from advection. Advection is phenomena of horizontal transport of heat due to strong hot and dry winds.

Modifying microclimates in agriculture involves altering the local climate conditions surrounding crops or plants to create a more favorable environment for growth. This can be achieved through various techniques when the crops are subjected to weather related stresses.
14.1. To Mitigate Moisture Stress during Droughts
When the crops are under moisture stress, the principles involved are conservation of soil moisture and reduce the evapotranspiration from crops. The moisture conservation can be achieved by suppressing soil evaporation using mulches (Fig. 14.1). The evapotranspiration can be reduced using antitranspirants. Some antitranspirents close the stomata of the leaves to reduce evapotranspiration. Some anti-transpirants increase the reflectance of radiation from the crops, thereby reducing heat load on crops. When crops are grown under irrigation in isolated patches, micro shelter belts can be provided across the predominant wind direction to reduce the increased evapotranspiration from advection. Advection is phenomena of horizontal transport of heat due to strong hot and dry winds.

The adoption of modern agricultural technologies has culminated into serious problems of pesticide resistance in major pests, resurgence in minor pests, elimination of populations of natural parasites, predators and pollinators, environmental pollution, pesticide residues in food chain and health hazards. World Health Organization (WHO) estimates one million pesticides poisoning cases and 20,000 deaths every year globally. This is due to high pesticide residues in food chain including cereals, pulses, vegetables, fruits, milk and milk products (including mother’s milk), fishes, poultry, meat products and water. Twenty five per cent of Indian food products contain pesticide residues above tolerance level compared to only 1.2% globally.

Herbicides are the chemical substances used to kill weeds, i.e., unwanted plants that compete with crop plants for soil nutrients. Chemical herbicides are the most effective immediate solution to most weed problems. Use of chemicals, however, can be harmful to wildlife, to the environment and to humans. Chemicals are also expensive, and weeds develop resistance to the chemicals. For these reasons, there is now a move toward alternative methods of controlling the weeds. One of the most promising is biological weed control, which involves using one living organism to control the activities of another organism.

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

Sustainable agriculture or organic farming wherein biological inputs are maximum and chemical inputs are minimal, is drawing the attention of farmers across the world including India. For replacing chemical fertilizers, which supply plant nutrients by organic manure, the basic requirement is the availability of raw material i.e. the organic matter or biomass that can be decomposed to organic manure. The question that is often asked is what are the different sources of available biomass and how much of it is available? Different sources of biomass can be categorized as