eChapters

The Crop Weather Calendar (CWC) is arguably one of the most practical and indispensable tools developed within agricultural meteorology. It transcends simple weather data by synthesizing comprehensive information about a specific crop’s entire life cycle with the historical climate patterns and recommended agricultural practices for a particular geographical area, typically an agro-climatic zone or even a district. More than just a timetable, it serves as a strategic blueprint that guides farmers and agricultural professionals toward optimized, resilient, and sustainable farming (Fig. 4.1).Imagine it as a detailed annual planner for a specific crop, where every entry is backed by decades of climate data and agronomic research. 4.2 Crop Weather Calendar: A Deeper Dive

This chapter is fundamental to agricultural water management, as it explains how water moves from the land surface and plants back into the atmosphere, directly influencing irrigation needs and drought impacts. Water is the lifeblood of agriculture, and its efficient management is paramount for sustainable food production. Understanding how water is lost from the soil and plants to the atmosphere is central to optimizing irrigation and assessing crop water needs. This chapter delves into the concepts of evaporation, transpiration, their combined effect as evapotranspiration, and how these relate to overall crop water use (Fig.5.1).

Definition: Evaporation is the physical process by which liquid water is converted into water vapor and transferred from the land surface (e.g., bare soil, water bodies, or wet plant surfaces) into the atmosphere. It is purely a physical process driven by solar energy and the vapor pressure gradient between the surface and the air.

The chapter will delve into the fundamental physics governing energy exchange at the Earth’s surface and how water is managed within the soil profile. These concepts are crucial for understanding microclimate, evapotranspiration, and overall water availability for crops. This chapter explores the intricate interactions between incoming solar radiation, its transformation into various energy forms at the Earth’s surface, and the dynamic movement and storage of water within the soil. Understanding these processes is vital for agricultural meteorology, as they directly influence temperature, humidity, and water availability for plant growth.The Earth’s surface, particularly a vegetated land surface, continuously exchanges energy with the atmosphere. The Surface Energy Budget quantifies these energy fluxes, explaining how incoming solar radiation is partitioned. It operates on the principle of conservation of energy: the energy received must equal the energy expended or stored (Fig. 6.1). The Earth’s surface energy budget numbers derived from Kiehl-Trenberth 1997. The surface of the Earth is cooled 40 W/m2 by radiation; this part of surface radiation is radiated straight into Space. 324 W/m2 of all outgoing surface radiation returns nearly simultaneously as back radiation. The remaining 26 W/m2 of surface radiation is absorbed by greenhouse gases and results in the warming of the atmosphere near the

Agriculture, the cornerstone of human civilization, is intrinsically linked to weather and climate. The success of crop production hinges significantly on the prevailing meteorological conditions, which dictate every stage of a plant’s life cycle, from germination and emergence to growth, flowering, and ultimately, yield. Understanding the intricate relationship between weather elements and specific crop requirements is paramount for maximizing agricultural productivity, ensuring food security, and developing resilient farming systems in the face of a changing climate. This chapter delves into the critical role that various weather parameters play in shaping crop performance. We will explore how factors such as temperature, precipitation (rainfall), sunlight (solar radiation, intensity, duration, and quality), humidity, and wind velocity interact to create the ideal environment for different crops. While plants possess an inherent adaptability, each crop species, and often even individual cultivars, has a specific range of “cardinal temperatures” (minimum, optimum

Crop yields and agricultural sustainability are inextricably linked to weather patterns. While optimal weather conditions facilitate robust growth and abundant harvests, extreme weather events pose significant threats, disrupting food systems and impacting livelihoods globally. The chapter, “Effect of Extreme Weather Conditions on Crops,” delves into the multifaceted ways in which deviations from ideal climatic norms compromise agricultural productivity. The Earth’s climate is characterized by increasing variability and the rising frequency and intensity of extreme weather phenomena. These include, but are not limited to, prolonged droughts, severe floods, heat waves, cold snaps, hailstorms, and unseasonal strong winds .Such events can occur suddenly or develop gradually over extended periods, each presenting unique challenges to different crop types at various stages of their life cycle. For instance, a sudden hailstorm can physically destroy crops, while a long-term drought can stunt growth, reduce yield quality, or lead to

Water is the lifeblood of agriculture, fundamentally dictating the success or failure of crop production worldwide. While sufficient and timely rainfall, or adequate irrigation, ensures healthy plant growth and bountiful harvests, an imbalance in the water supply can quickly escalate into a crisis. Among the various forms of drought—meteorological, hydrological, and socio-economic - agricultural drought stands as the most direct and immediate threat to food security and farm livelihoods. It represents a critical shortfall in the moisture necessary to sustain crop growth, leading to reduced yields, compromised crop quality, and often, complete crop failure (Fig. 9.1). effective mitigation and adaptation strategies. This chapter will delve into the precise definition of agricultural drought, differentiate it from other drought types, and critically examine its various forms based on the timing of water deficit during a crop’s life cycle. By dissecting the characteristics of early season, mid-season, terminal, and apparent permanent droughts, we aim to provide a comprehensive understanding of how water scarcity at different stages impacts crop physiology, productivity, and the broader agricultural landscape.

This chapter would typically focus on the practical implementation aspects of a national drought management policy, emphasizing the scientific and technological tools, analytical models, and ongoing research necessary for effective drought preparedness, mitigation, and response. 10.1.1 Drought Monitoring and Early Warning Systems • Indicators and Thresholds: Defining and utilizing a suite of meteorological, agricultural, and hydrological indicators (e.g., Standardized Precipitation Index (SPI), Aridity Anomaly Index (AAI), Normalized Difference Vegetation Index (NDVI), soil moisture data, reservoir levels, groundwater levels). • Monitoring Networks: Establishing and maintaining networks of ground-based weather stations, rain gauges, and river flow gauges. • Remote Sensing and GIS: Utilizing satellite imagery and Geographic Information Systems (GIS) for large-scale, near real-time drought assessment, vegetation health monitoring

The intricate dance between life and its atmospheric surroundings has shaped every living organism on Earth. From the microscopic bacteria thriving in extreme environments to the complex physiological systems of humans and large animals, weather and climate are not merely backdrops but active, pervasive forces dictating survival, distribution, behavior, and health. Weather, representing the short-term atmospheric conditions we experience daily— temperature, humidity, precipitation, wind, and sunlight—directly influences immediate comfort, activity levels, and susceptibility to acute events. Climate, on the other hand, embodies the long-term patterns and averages of these atmospheric variables over decades or centuries, acting as a fundamental determinant of ecosystems, biodiversity, and the sustained well-being of populations. This chapter delves into the multifaceted ways in which these atmospheric phenomena exert their influence. We will explore how thermal conditions drive physiological responses, from metabolic rate adjustments and thermoregulation to the very limits of endurance in extreme heat and cold. Beyond direct physiological impacts, we will examine the indirect effects, such as the role of climate in shaping

The Asia-Pacific region is highly vulnerable to climate change, with impacts such as more frequent natural disasters, sea-level rise, floods, droughts, and changing weather patterns. Rural areas, particularly those reliant on agriculture, are disproportionately and non-identically affected. The Asia-Pacific region, home to over 60% of the world's population, is among the most vulnerable to climate change due to its diverse geography, dense coastal populations, and socioeconomic disparities [IPCC, 2022a], Climate change is an emerging threat that affects all countries to varying degrees. The recently released IPCC Assessment Report identified agriculture as one of the critical sectors both susceptible to climate change and contributing to it through Greenhouse Gas (GHG) emissions. Countries in the Asia-Pacific region are investing significant resources to strengthen agriculture on various fronts. These investments focus on the research and development of new varieties and agro-technologies to adapt agriculture to emerging climatic threats and, simultaneously, mitigate GHG emissions from the agricultural and allied sectors. These initiatives are in their early stages, and there is a need to assess the current status of countries' vulnerability to climate change and the measures taken to address

The vulnerability of agriculture and livelihoods in the Member Countries of the Centre on Integrated Rural Development for Asia and the Pacific (CIRDAP) poses a significant threat to achieving climate- resilient rural development. CIRDAP includes 15 member countries: Afghanistan, Bangladesh, Fiji, India, Indonesia, Iran, Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Sri Lanka, Thailand, and Vietnam [CIRDAP, 2023]. ]. In many Asian countries, agriculture is still practiced using traditional methods that do not incorporate climate data or modern techniques. This reliance leads to several challenges, such as reduced productivity and crop diversity, increased vulnerability to weather fluctuations, and hindrance in establishing resilient value chains. For example, in Iran's rural sector, challenges such as centralized planning, patriarchal norms, inefficient extension systems, and weak inter-agency coordination are uniquely defining features (CIRDAP, 2025). However, evidence shows these challenges are widespread across the region:

Climate Smart Agriculture (CSA) is an integrated approach to managing landscapes—cropland, livestock, forests, and fisheries—to address the interlinked challenges of food security, climate change adaptation, and mitigation [FAO, 2023]. In the context of the Centre on Integrated Rural Development for Asia and the Pacific (CIRDAP) Member Countries, which span diverse agro- ecological and socio-economic landscapes across South Asia, Southeast Asia, and the Pacific, CSA emerges as a pivotal strategy for fostering climate- resilient rural development [CIRDAP, 2023]. These countries, including Bangladesh, India, Indonesia, Pakistan, Vietnam, and others, face significant climate vulnerabilities such as rising temperatures, erratic rainfall, extreme weather events, and sea-level rise [IPCC, 2022]. CSA offers a framework to enhance agricultural productivity, strengthen resilience, and reduce greenhouse gas emissions, aligning with the region's Sustainable Development Goals (SDGs) and rural livelihoods improvement [UN, 2023]. The contribution of agricultural GHG emissions

Governments play a pivotal role in fostering CRRD by formulating policies, mobilizing resources, and promoting sustainable practices to enhance rural resilience. Governments in CMCs are central to designing and implementing policies that integrate climate resilience into rural development. 4.1.1 Policy Frameworks for Climate Resilience National adaptation plans (NAPs) and climate- focused agricultural policies are critical tools. For instance, Bangladesh's National Adaptation Programme of Action (NAPA) prioritizes climate- resilient crops and coastal embankments to protect rural communities from salinity intrusion (MoEF, Bangladesh 2005). Similarly, India's National Mission for Sustainable Agriculture promotes climate-smart farming techniques like zero-tillage and drought-resistant seeds (MoAFW, India 2023). These policies align with CIRDAP's mission to foster sustainable rural development by addressing region-specific

Climate-resilient rural development is a critical priority for CMCs, given their vulnerability to climate change impacts such as floods, droughts, cyclones, and rising temperatures. This note explores case studies and success stories from some of the CMCs, highlighting innovative approaches, community- driven initiatives, and policy interventions that enhance climate resilience in rural areas. The examples draw from documented projects, emphasizing practical outcomes and lessons learned. Case studies of specific CMCs 1. Bangladesh: Saemaul Zero Hunger Communities (SZHC) Project In central Bangladesh, the Saemaul Zero Hunger Communities (SZHC) project (2014-2017) focused on 19 flood-prone villages to strengthen resilience to climate shocks and improve food security (UNDP, 2018). Implemented in collaboration with local communities

The Imperative for Regional Collaboration Climate change poses a transboundary threat that no single nation can address in isolation. In CMCs, rural populations, often dependent on agriculture and natural resources, are disproportionately vulnerable. For instance, Assam, India, faces rising temperatures and frequent floods, threatening 86% of its agriculture-dependent rural population. Similarly, Bangladesh, a climate change hotspot, grapples with salinization and cyclones that disrupt rural livelihoods. Regional collaboration offers a pathway to pool resources, share expertise, and develop scalable solutions. As the United Nations Economic and Social Commission for Western Asia highlights, collaborative action enhances food and water security through shared knowledge

The Asia-Pacific region, particularly the rural areas within CMCs, faces severe climate change impacts, including frequent natural disasters, rising temperatures, and sea-level rise, which threaten agriculture, livelihoods, and food security. Climate- resilient rural development (CRRD) is crucial for mitigating these vulnerabilities, addressing challenges such as agricultural dependency, limited infrastructure, governance gaps, financial constraints, and socio-cultural barriers. Key approaches like climate-smart agriculture, strengthened infrastructure, innovative start-up ecosystems, enhanced access to climate information, and inclusive policies empower rural communities to adapt and thrive. Stakeholders—governments, international organizations, the private sector, and local communities—play complementary roles in driving resilience through policy, funding, technology, and grassroots innovation. Sensitising all stakeholders across countries to mainstream climate change aspects and its impact on livelihoods, among all departments and the information dissemination by these departments to the public and relevant stakeholders regarding the climate change effects needs to be a continuous process. Success stories from Bangladesh

Environmental contaminants are defined as substances introduced into the environment, either naturally or anthropogenically, that pose potentialharm to living organisms and ecosystems (Masindi and Muedi, 2018).These contaminants include a diverse range of pollutants, such as chemicalagents, biological contaminants and physical pollutants (Ahmed et al.,2021). Understanding these contaminants and their toxicity is of paramountimportance, given their profound implications on human health, biodiversityand the overall functioning of ecosystems (Samuel et al., 2023).Environmental contaminations are pervasive in nature and originated fromdiverse sources. Industrial activities are major contributors, releasing heavymetals, organic solvents, and particulate matter into air, water and soil(Williams, 2019). Similarly, agricultural practices contribute to contaminationthrough excessive use of fertilizers and pesticides, which often runoff intoaquatic systems, causing eutrophication and harming aquatic life (Zahoor and
Mushtaq, 2023). Urbanization and improper waste management have alsointensified the problem with plastics and emerging contaminants finding theirway into ecosystems (Singh et al., 2022). Even natural events like volcaniceruptions and forest fires contribute to environmental contamination, thoughtheir impacts are often localized and episodic compared to the persistent andwidespread pollution caused by human activities (Ernst, 2012).The study of environmental contaminants and their toxic effects is of vitalimportance for several reasons in today’s context of escalating global pollution(Hussain and Reza, 2023). First, it provides insights into the health risks posedto humans and wildlife (Pereira et al., 2015). Many contaminants, such as lead,mercury and polychlorinated biphenyls (PCBs), are known to have chronic andacute toxic effects on biological systems, affecting neurological, reproductivand immune functions (Priyadarshanee et al., 2022). These substances interactwith biological systems in complex ways, often leading to adverse outcomessuch as bioaccumulation, oxidative stress, endocrine disruption and ecologicalimbalances (Satkar et al., 2024). Heavy metals like lead and mercury are
known to accumulate in organisms and disrupt critical biological functions,while synthetic chemicals like bisphenol A (BPA) can interfere with hormonalsystems, resulting in reproductive and developmental issues (Pan et al., 2024).Such impacts underscore the need to understand how these substances interactwith living organisms, identify their exposure thresholds and mechanisms oftoxicity to formulate strategies for risk assessment and mitigation (Kumar andSingh, 2023).

1. Introduction
Bioremediation is a process that utilizes biological agents, such asmicroorganisms, to eliminate pollutants, making it a natural and efficientmethod for environmental cleanup. This approach is considered cost-effectiveas it transforms harmful pollutants into less toxic substances through microbialdegradation or detoxification. Currently, many developing nations areprioritizing industrial growth, urbanization, and the use of agrochemicals inagriculture, which has heightened the importance of bioremediation and drawnsignificant attention to this practice. As a sustainable solution, bioremediationoffers a way to restore healthier ecosystems by removing pollutants from theenvironment (Fig. 1).

1. Introduction
One of the foremost environmental challenges the world faces today is airpollution. As industrialisation, urbanisation, and transportation continueunabated, harmful substance levels in the atmosphere have becomealarmingly high (Thanvisitthpon et al., 2024). This general contamination inthe air is not just a serious risk to humanity but also harms ecosystems whilcontributing to global climate change. Controlling airpollution has becomea critical necessity at this stage, with the need for innovative solutions inthis respect. Bioremediation is one of the innovative solutions, where certainmicroorganisms break down or neutralise pollutants in the air.

1. Introduction
Agro-industrial waste plays a crucial role in bioremediation, the process of usingbiological organisms to remove or neutralize pollutants from contaminatedenvironments (Garg, 2020). With the rise of industrialization and agriculturalactivities, there’s a corresponding increase in waste production. However,these waste materials, often rich in organic compounds, can be repurposedas valuable resources as mentioned in scientific studies (Sahota and Sharma,2020; Yadav et al., 2022).

1. Introduction
1.1. The Growing Problem of Pesticide Pollution
Pesticides are used in very great amounts in agricultural production for theprotection of crops against pests, diseases and weeds. They are also veryinstrumental in boosting agricultural productivity by ensuring food securityand preventing losses that may be caused by outbreaks of pests (Popp et al.,2013). However, the extensive use of pesticides has generally resulted in hugeenvironmental concerns. Improperlymanaged pesticide residues may remainin soil, water and even air for many years and create severe ecological andhealth hazards in the long run (Zhang et al., 2024). This widespread existenceof pesticides in the environment has raised a serious alarm concerning theiradverse impacts on biodiversity, soil fertility and quality of water, furtherbioaccumulation in the food chain that affects wildlife and human populations(Aktar et al., 2009).