eChapters

Introduction

An integrated approach to understanding the changing dynamics in water resources involves taking into account various factors that influence the management of water resources under changing climatic conditions (Pahl-Wostl, 2007). It is a holistic approach that combines different disciplines, including hydrology, climatology, ecology, geography, and social sciences, to develop a comprehensive understanding of water resources. The integrated approach is essential for several reasons, including addressing climate change impacts, sustainable management of water resources, enhancing water security, addressing water quality issues, and promoting collaboration among stakeholders. Climate change is causing alterations in precipitation patterns, melting glaciers, and changes in river flows, affecting water availability and quality. An integrated approach helps in understanding the climate change impacts on water resources and developing adaptation strategies (Asif et al., 2023).

A brief description of IGMC is given in Para 6.6 with details of the canal sections. Here an attempt is made to review the hydraulic performance of the Main Canal.

7B.1 Study of Flow Characteristic of the Main Canal

The main canal is designed for a maximum discharge of 524 m3/s at head i.e. at Km. 0. Large of number of branches, distributaries and minors off take from the main canal at different location all along the canal. These are shown in the L- section, Figure 7B.1 and a statement off taking canals is given Table 7B.1. Many distributaries such as lift canals have been planned subsequently. Also discharges of few off taking channels have been changed. A clear and updated data are not readily available. So data available are indicated in the Table and plotted in the L - section. A half bottom plan of the canal is also shown in Figure 7B.2

6.0 General

No lessons can be drawn without the experiences of the past. In fact, much of engineering, rather all sciences have developed in bits and pieces from the experiences of the past. The engineers by and large have never become wiser in one day. They have become wiser slowly and slowly with their own experiences and from the experiences of past engineering works. Wisdom lies to gain wisdom from experiences/draw lessons from the marvellous engineering works constructed so far. It helps us in a direction for further development of technological skills.

Here an effort is made to draw lessons from experiences of the canals constructed in the past.

 There are several aspects of such experiences. A few important aspects of studies are:

 (i) Internal hydraulic sections of the canal with respect to discharge, topography, stability of side slopes, type of lining, operation and maintenance problems and their solutions etc.

 (ii) Design of canals banks (embankment) with respect to discharge, depth of flow, depth of cutting /filling, below/above natural ground level, type of soil, topography, operation and maintenance, drainage of banks etc.

 (iii) Canals aesthetics and arboriculture

 (iv) Other utility/service of canal such as multi-objectives of hydropower, irrigation, drinking/industrial water supply, social needs of recreation, forests etc.

A. Rectangular Canals

5.1 Design of Best Rectangular Canals

After the Mehboob and Trapezoidal canals, next best section is rectangle. This section is also generally adopted for small discharges say upto 10 cumecs (350 cusecs). This section ranks at No. 4. Yet, this is the only section most commonly adopted for flumes of discharges upto140 cumecs (5000 cusecs). Typical example is Orsang acqueduct, 1 km. long for 1140 cumecs (40000 cusecs) in ractangular sections on Narmada Canal Project, Gujrat, India, built in the years from 1990 – 2000. Such sections are common in power house canals due to limitation of space and very sharp curves. It is free from the effect of change of side slopes as in the trapezoidal canals (see para 3.3) Still some small side slope (batter) is adopted in thick masonry / concrete lining. It adds to structural stability with economy in thickness of wall and as well as hydraulic efficiency. It may still be called as rectangular section.

Details of its hydraulic efficiency in comparison to semi circle, Mehboob and trapeziodal sections are discussed in chapter 1, para 1.8

A canal of more than 80 cumecs (3000 cusecs) approximetly may be called as a high capacity canal.

It has already been pointed out in chapter 1, that for the best section of any shape, R is always equal to d/2 only, and such depth is the most optimum depth. But such channels are not always practical or most economical due to many other practical reasons, (see para 4.1 and 6.3) and many times shallower depth then this depth is adopted. Typical examples are lining of existing earthen channels, given in para 6.3.

All the best sections have fixed ratio of dimensions very near to the semi circle. For large discharges, radius of semi circle increases that, means depth of canal as well as velocity increases. But higher velocity is not permissible with every type of lining (see table 2.1 and para 2.3). Similarly depth also has limitation of construction, maintenance, stability of slopes, etc. see example–4.2.

Because of limiting velocities and depth, deeper canal section are not practically feasible/possible. Therefore for large discharges, say more than 100 cumecs, Mehboob or best trapizodal sections are just not possible/practical, and recourse has to be taken to trapezoidal section with increased bed width then depth. This section is hydraulically inefficient or uneconomical. Larger the B/D ratio, larger is the inefficiency and section is more costly. (For Mehboob Section, B:D ratio is zero and for best trapizodal section it is much less than 1, see para 3.1, table 3.1 para 3.5 and table 3.4).

A canal of approximate discharge of less than 80 cumecs (3000 cusecs) discharge may be called a medium or low capacity canal).

3.1 Mehboob Section

A Mehboob Section is only a modification of best trapezoidal section by making its complete bottom circular as shown in figure 3.1. Also see figure 1.6 and para 1.7. That is why these canals are also known as canals of zero bed width, or trapezoidal canals with curved bottom, or cup shaped canals.

But these cannot be called as triangular canals with curves, as often spoken. In fact it is a truncated triangle circumscribing the semi circle. Trapezium is also a truncated triangle circum scribing a circle.

More accurately it can be said as a combination of semi circular and best trapezoidal section so as to take full advantage of their hydraulic efficiency and practicability.

This is such a beautiful section that the designer can never commit a mistake, even if he wants to commit a mistake. The dimensions are so geometrically fixed that no one can play with any dimension.

The value of this section was realised for the first time by Er S I Mehboob (1943) in his Punjab Irrigation Branch Paper No.260" Lining of Canals". There after this canal section became well known as Mehboob Section after his name. He also stated that the most economical section i.e. the maximum area for the minimum perimeter is when the centre of the arc is at the full supply line of the section. This is also evident in figure 1.6. This is also the condition for all best hydraulic sections. This section is also useful to a higher silt carrying capacity than a wide shallow one..

Theoritical aspects of design has been discussed in chapter 1. Discharging capacity of canal is

 computed by Manning Equation (1)and continuity Equation (2) (Para 1.4).

 In the Manning's equation  V  =   R2/3  S1/2 / N (Eq. 1, Para 1.4);  N and R play most important role.

 The effect of  R has been discussed in para 1.4.1, Chapter 1. In this chapter the complexities of Manning's n (or N, also known as Manning's rougosity coefficient

 or simply rougosity coefficient) and some practical aspects of composite sections and velocity in best

 Mehboob, trapezoidal or rectangular sectioned channels are discussed.

2.0 Manning's Rugosity Coefficient (n)

Value of N depends upon a number of factors such as , surface roughness, vegetation, obstructions, type of lining, age of lining, erosion and damages in lining, curves, discharging capacity , perimeters, depth of flow, velocity etc. These are discussed below and commonly adopted values of n are given in tables 2.1 to 2.3.

1.0 General

 The design of canal involves following three major aspects:

 A Irrigation and drainage canal network planning.

 B Determination of discharge / capacities of  canals and drainages.

 C Determination of shape and size i.e. geometrical dimensions of the proposed canal section, generally

 known as design of canal section. More appropriately it can be called as design of internal section

 of canal. It can be further divided in three following parts viz.

 i. Design of unlined canals:

 ii. Design of lined canals: or a canal may be partly lined and partly unlined.

 iii. Choice between the unlined and lined canals. This aspect should be distinguished from the selection of type of lining. However, the scope of choice of lining may include both the aspects.

 The design of canal section remains incomplete without the design of its embankments, either in lined or unlined canal, so the next aspect is

 iv. Design of canal embankments. Still to complete the design of a canal one more aspect is required i.e.

 v. Canal aesthetics and canal arboriculture.

Role-play is a product of ‘play’, ‘games’ and ‘simulation’ (Gabrielle McSharry, 2000). In science education, role-play may be seen as an interaction between these three components – either in combination or by themselves – and students who perform such activities results in learning outcome. In the context of social studies, role-play is used to learn the issues and decisions of the past and how things might have been different in local community in a broader setting. Aside from knowledge acquisition, preparing and conducting a role-play activity strengthens students’ knowledge, acquisition skills, their creativity, their values clarification skills and a variety of interpersonal skills identified in the curriculum outcomes. As an effective instructional teaching strategy, role-playing emphasizes the social nature of learning and sees cooperative behaviour as stimulating students both socially and intellectually.

Data Collection: An Academic Perspective

Data collection constitutes the systematic gathering and measurement of information pertinent to variables of interest. This process facilitates the answering of research inquiries, hypothesis testing, and outcome evaluation. It is a fundamental component across all academic disciplines, encompassing physical and social sciences, humanities, business studies, and more. While methodologies may diverge among fields, the fundamental objective remains constant: ensuring the precise and ethical acquisition of data. The overarching aim of data collection is to acquire high-quality evidence that underpins robust data analysis, thereby enabling the construction of compelling and credible research outcomes.

Participatory Rural Appraisal (PRA) stands as a methodological framework comprising participatory and visually oriented techniques for assessing communal and group resources, discerning and prioritizing challenges, and evaluating strategies to tackle them. It serves as a research and planning approach wherein local communities, with or without external guidance, engage in a comprehensive examination of issues pertinent to their populace. The process involves identifying problems, weighing various solutions, and formulating a Community Action Plan to address the identified concerns. Central to PRA is the inclusion of diverse community perspectives in the analysis and empowering the community to lead the evaluation of its circumstances and the search for remedies. While external actors may partake as facilitators or providers of technical expertise, the autonomy of the community in driving the process is paramount.

Brainstorming is a group creativity technique by which efforts are made to find a conclusion for a specific problem by gathering a list of ideas spontaneously contributed by its members. The term was popularized by Alex Faickney Osborn in the 1953 book Applied Imagination. Osborn claimed that brainstorming was more effective than individuals working alone in generating ideas, although more recent research has questioned this conclusion. Today, the term is used as a catch all for all group ideation sessions.

Origin

Advertising executive Alex F. Osborn began developing methods for creative problem solving in 1939. He was frustrated by employees’ inability to develop creative ideas individually for ad campaigns. In response, he began hosting group-thinking sessions and discovered a significant improvement in the quality and quantity of ideas produced by employees.

Teaching

Extension teaching denotes a structured process aimed at fostering the learning experience. This process encompasses the facilitation of activities, provision of materials, and offering guidance necessary for the learner. In essence, it orchestrates scenarios wherein the subjects to be assimilated are brought to the learners’ attention, fostering their interest, engendering desire, instilling conviction, prompting action, and ensuring satisfaction.

Characteristics of Teaching

1. The quintessential objective of teaching transcends mere dissemination of information; rather, it endeavors to effect transformative changes in behavior.

2. Teaching is deemed efficacious only when learning is effectively acquired by the learner.

3. Teaching, analogously, is akin to illuminating a lamp rather than merely f illing a receptacle.

4. Teaching is a deliberate, purposeful endeavor, not a haphazard undertaking.

5. Effective teaching is methodically executed according to predetermined designs rather than being subject to inadvertent deviations.

6. Proficient teaching necessitates meticulous planning encompassing content, procedures, methods, and techniques.

7. Superlative teaching fundamentally hinges upon adept communication, which, in turn, demands empathetic sharing and lucid exposition.

Personality, a term deeply ingrained in our everyday discourse, encapsulates the essence of what makes individuals unique. This multifaceted construct has intrigued scholars, philosophers, and psychologists alike throughout history. Its exploration not only delves into the intricacies of human nature but also seeks to unravel the complexities of individual differences and behavior.

The journey to understand personality spans millennia, with its roots tracing back to ancient civilizations. Early philosophical inquiries by thinkers such as Plato and Aristotle pondered the nature of character and temperament, laying the groundwork for later conceptualizations. However, it was not until the late 19th and early 20th centuries that personality garnered significant attention within the realm of scientific inquiry. The emergence of psychology as a distinct discipline heralded a new era of systematic study into the intricacies of human behavior and individual differences. Influential figures like Sigmund Freud, Carl Jung, and Alfred Adler pioneered seminal theories that sought to elucidate the dynamics of personality development, the unconscious mind, and the interplay of internal drives and external influences.

In the vast array of terrestrial organisms, the human species is commonly regarded as possessing a distinctive and elevated status owing to its faculty for moral discernment. This faculty encompasses the capacity to adapt to diverse environmental conditions, adeptly navigate complex circumstances, demonstrate comprehension, exercise authoritative control, and effectively tackle arduous tasks through the assimilation and judicious application of prior experiences. Termed intelligence, this quality is observed to manifest across a spectrum of degrees among individuals.

Social psychology, as previously elucidated, endeavors to delineate the nature of social behavior. Social behavior encompasses four fundamental types of interactions

i) When individuals encounter one another, mutual reactions occur. Each individual influences the other, and reciprocally, they are influenced by each other’s presence.

ii) Individuals may elicit responses from groups, such as when an extension worker interacts with a gathering of farmers.

iii) Conversely, groups collectively respond to individual members, as exemplified by a group’s reaction to its leader during a meeting. iv) Interactions extend to intergroup dynamics, where one group of individuals reacts to another group.

Psychology is the scientific study of behavior and mental processes. It encompasses various fields such as cognitive psychology, developmental psychology, social psychology, and more. The genesis of psychology finds its roots in the pioneering work of Sigmund Freud, widely regarded as the Father of Psychology. Etymologically, the term “psychology” stems from the amalgamation of two Greek words: “psyche,” denoting soul, and “logos,” connoting science or rational discourse. Thus, linguistically dissected, psychology embodies the study or science of the soul.

Psychology is the scientific study of behavior and mental processes. It encompasses various fields such as cognitive psychology, developmental psychology, social psychology, and more. The genesis of psychology finds its roots in the pioneering work of Sigmund Freud, widely regarded as the Father of Psychology. Etymologically, the term “psychology” stems from the amalgamation of two Greek words: “psyche,” denoting soul, and “logos,” connoting science or rational discourse. Thus, linguistically dissected, psychology embodies the study or science of the soul.

Training plays a vital role in enhancing the capabilities of individuals to perform their roles effectively. In the context of leadership development, training aims to equip potential leaders with the necessary skills, knowledge, and attitudes to excel in their roles. This paper examines the objectives of leadership training and the methods by which these objectives can be achieved.

Meaning of Training

The term ‘training’ refers to a structured process designed to improve an individual’s ability to fulfill their responsibilities. It involves imparting knowledge, developing skills, and shaping attitudes to enhance professional competence. For potential leaders identified through various selection methods, training serves as a means to cultivate essential leadership traits that may be lacking initially.

The concept of leadership revolves around the figure of a person who wields influence over a group of individuals. Such an individual often emerges through their ability to initiate and guide social behavior, directing the efforts of others, organizing tasks, or exerting control, often leveraging their prestige, power, or positional authority. In various social contexts, a leader is recognized as someone whose ideas and actions significantly impact the thoughts and behaviors of those around them. This recognition can occur spontaneously or through deliberate selection, where certain individuals within a society operate within groups to guide and influence members towards specific actions.

Leadership, therefore, is construed as a dynamic process wherein individuals endeavor to shape the behavior of others within a tangible scenario. One commonly accepted definition, posited by Rogers and Olmsted, characterizes leadership as the endeavor to persuade individuals to collaborate towards a goal perceived as beneficial by the collective. Another perspective, articulated by Hepple, frames leadership as the role and status held by one or more individuals within the organizational structure of a group. This status enables these individuals to facilitate the functioning of the group and fulfill its objectives, which often necessitate the cooperative efforts of its members. Thus, leadership emerges as a multifaceted phenomenon, encompassing both the actions of influential individuals and the structural dynamics within group organizations.

Social Control

Social control denotes the influence wielded by the public or society aimed at fostering the collective welfare of the group. It entails mechanisms that induce individuals to adhere to societal norms and moral standards, thereby guiding their behavior towards socially acceptable actions. The imperative role of social control lies in upholding societal stability, which is indispensable given the inherent variability of human nature and the pervasive impact of environmental factors.

Various scholars have offered insights into the concept of social control:

According to Mannheim, social control encompasses the array of methods employed by a society to shape human behavior, thereby preserving a predetermined social order.

Anderson defines organizations as structured human relationships wherein individuals purposefully associate in systematically arranged units to advance and achieve common purposes or interests not explicitly articulated within the institution. Each member assumes a formal status and role within this framework. Distinguishing an organization from an institution lies in its focused pursuit of narrowly defined objectives; it constitutes a collective of individuals organized to pursue specific aims. Conversely, an institution encompasses broader and more general objectives, constituting a set of socially endorsed procedures entailing patterned behavior, norms, and regulations. Organizations may function within institutions, thereby contributing to and facilitating the achievement of institutional objectives. The formation and structure of an organization evolve through the delineation of specialized activities, formulation of rules and regulations for operations, establishment of meeting schedules and locations, ultimately rendering the organization a clearly delineated entity with specific objectives, officers, and membership.

Social institutions encompass a cohesive array of norms that uphold fundamental societal values. It refers to a structured system of social relationships that encapsulates shared values and protocols, fulfilling specific societal requirements. According to Horton, it embodies common values and procedures, addressing the fundamental needs of a society. These institutions are formal cultural frameworks designed to satisfy essential social needs and establish organized patterns of human behavior in the execution of core societal functions

Social institutions emerge from societal interactions to address fundamental needs such as stability, law enforcement, and the delineation of authority and decision-making roles. Each organization operates within established sets of rules, traditions, and customs, collectively termed as institutions. These institutional frameworks consist of recognized procedures and norms that are accepted by society, regulating interactions and relationships between individuals and groups.

Values denote the subjective significance or preferences accorded to objects, concepts, or experiences within an individual’s cognitive framework. The concept of value encompasses entities or outcomes that are desired or selected by individuals. Social values, as expounded by Green (1964), represent enduring cognitive and affective constructs pertaining to objects, ideas, or individuals within a societal context. These values are often abstract in nature and may operate at a subconscious level, embodying implicit assumptions regarding what is deemed morally and socially significant. As articulated by Young (1959), social values encapsulate abstract and subconscious beliefs regarding notions of righteousness and importance within a communal framework.

Extension education serves as a catalyst for altering the behavioral complexities within rural communities. This behavioral shift is intricately intertwined with cultural determinants, thereby necessitating extension workers to possess a profound understanding of rural cultural dynamics. Culture, delineated as learned behavior organized into patterns and disseminated among society members, constitutes a foundational concept in sociology, elucidating the regularities observed in human actions. Unlike its colloquial interpretation, which often limits culture to refined expressions such as art and music, sociological discourse expands the scope to encompass the entirety of learned behaviors, attitudes, beliefs, and social norms characteristic of a specific group.

Social stratification refers to the hierarchical arrangement of individuals or groups within a society based on various factors such as wealth, power, education, and social status. It involves categorizing people into different layers or strata, each with its own level of privilege, opportunities, and restrictions.

Social stratification, as defined by Lundberg (1968), pertains to the categorization of a population into distinct layers, each characterized by relative homogeneity and marked differences in privileges, restrictions, rewards, and obligations. Cuber (1954) further elucidates this concept, describing social stratification as a pattern of superimposed categories of differential privilege. The movement of individuals or groups across different strata within society is termed social mobility. Social stratification manifests in various forms, with the caste system and class system being two major types. Societies exhibit stratification based on factors such as sex, age, and occupation.

A social group is commonly conceptualized as an entity comprising two or more individuals engaged in reciprocal communication, characterized by shared traits and possessing a collective sense of unity. Within the framework of the social identity tradition, researchers delineate groups as entities whose members self-identify as part of the collective. Social groups exhibit diversity in terms of size and typologies. For instance, an individual’s initial social interactions occur within the familial context, where interactions with immediate family members, notably the mother, serve as primary points of contact. Subsequently, as the individual progresses through developmental stages, engagement with peers and neighbors expands the social sphere, constituting another significant social group. Further social group affiliations emerge during formal education, as the individual integrates into student cohorts within educational institutions. Over time, the individual assumes diverse roles within broader societal contexts, contributing to the fabric of community and national citizenship. The diagrammatic representation of an individual’s interaction with his/her social group is as under.

Society

Human societies are intricate networks of individuals engaged in continuous social interaction within a shared geographical or social space, typically under the governance of the same political authority and cultural norms. These societies are characterized by complex patterns of social relations, cultural practices, and institutional structures, collectively shaping the fabric of human existence. Social sciences often reveal underlying stratification and dominance patterns within these societies. Collaborative in nature, societies offer collective benefits that transcend individual gains, facilitating opportunities that would otherwise remain inaccessible. Within a society, subcultures may emerge, governed by their distinct norms and values, coexisting within the broader societal framework. Structurally, societies encompass economic social, industrial, and cultural infrastructures, comprising diverse individuals yet forming a cohesive entity. The term “society” traces its origins to the Latin word “societas,” signifying friendly or civil interaction among parties. It encompasses the entirety of humanity, acknowledging the interdependence and interactions among individuals.

10.1. Introduction

Irrigation facilities are created by the Government at huge cost for supplying water to the farmers for raising crops to increase agricultural production. The major and medium irrigation projects are planned, constructed, managed, operated and maintained by the Irrigation Departments, wherein certain procedures and rules are evolved and followed to the delivery schedule of canals, frequency of supply and distribution of water to the farmers, and closing of canals. The creation of such facilities resulted in ushering the green revolution in the sixties and seventies in the production of food grains and also employment generation in the country, thereby improving the socio-economic condition of Indian farmers. However, optimized management of irrigation water is the key to the sustainable development of agriculture and livestock. Since management of water for irrigation is highly location-specific, depending upon agro-ecological and socio-economic conditions, type of irrigation project and land use pattern, it differs from project to project and region to region in the country.

9.1. Introduction

Human dependence on natural processes for the goods and services provided by nature, especially food, fuel and fibre, has been a known fact. In recent times, the value of less tangible services, such as climate control, water f iltration, and soil fertility, as well as recreational and cultural services has been emphasized also. Ecosystem services underpin human existence, health, and prosperity. It has been beneficial to humans through the transformations of resources (or environmental assets, including land, water, vegetation, and the atmosphere) into a flow of essential goods and services like clean air, water, and food (Costanza et al., 1997). Ecosystem services are those functions of ecosystems- including agroecosystems that are useful to humans or supportive of human well-being (Kremen, 2005). Services provided by ecosystems receive little notice for their support to human civilization often leading to poor management of the ecosystems. Land use systems influence ecosystem functions, which determine the supply of ecosystem services. Land and water resources are under considerable pressure from the expansion of cultivated and residential lands. Diverse land use in agrarian landscapes not only fosters biodiversity, but also provides potential ecosystem services such as air cleaning by vegetation, natural water filtration by plant roots, natural pest suppression, soil conservation, nutrient retention, and crop pollination by insects, etc. Lowland floodplains or waterlogged land areas are generally more conscious of the benefits provided by ecosystem services. It is important to create awareness among the people on provisioning services provided by ecosystems, such as crops, biofuel, fresh water, natural medicine, wildlife, and several cultural services. Managing ecosystem services, which link human well-being to conservation outcomes, is essential for achieving the sustainable development goals (SDGs) of the United Nations (Zhang, 2017).

8.1. Biofloc aquaculture

Among the innovations in the field of aquaculture, biofloc technology (BFT) has attracted great attention due to its ability to foster the goals of sustainable aquaculture (Khanjani et al., 2022a). If implemented correctly, BFT capitalizes on the existing organisms in water to significantly reduce water use and environmental impact and increase biosafety at farms (Avnimelech, 2012).

7.1. Introduction

The integrated farming system (IFS) is becoming increasingly important for effective farm resource management in order to increase farm productivity, reduce environmental degradation, improve the quality of life for resource-poor farmers, and ensure sustainability. Integration happens when one production sub-system's outputs (typically by-products) are used as inputs in another within the farm unit (Radhammani et al., 2003; Lightfoot and Minnick, 1991). IFS are a mixed farming system made up of at least two distinct but logically linked components of crop and animal enterprises. The integrated farming system is effective in reducing risk, increasing productivity and revenues, and improving the use of organic waste and agricultural leftovers.

5.1. Introduction

Rice-fallows are a rainfed rice mono-crop production system, where only a single crop (rice) is grown and these lands remain without any crop for the rest of the period of the year (fallow). An estimate shows that rice-fallow areas extended over 22.3 M ha in South Asia, maximum in India ( 88.3%) followed by Bangladesh (8.7%), Nepal (1.4%), Sri Lanka (1.1%), Pakistan (0.5%), and Bhutan (0.02%) (Gumma et al., 2016). The eastern part of India accounts for ~ 84% (9.7 million ha) of the country’s total rice-fallow area (i.e. 11.7 million ha) (Ali et al., 2014; Singh et al., 2017), despite high rainfall during rainy / monsoon season. The reasons are that after the rainy season, irrigation facilities are lacking, very fast depletion of the soil residual moisture due to temperature rise, the poor economic condition of the farmers, and a lack of awareness or knowledge of available technologies. Additionally, delayed harvesting of long-duration rice (150-160 days) results in late sowing of winter crops, which, in turn, exacerbates the temperature and moisture stresses in winter crops (Kumar et al., 2018a; 2018b). Overall, the challenges of growing another crop in rice-fallow areas are the lack of irrigation facilities including declining groundwater levels, the dominance of the long-duration rice varieties cultivation, higher evaporative loss of the residual soil moisture, degradation of soil quality, and poor financial conditions of the farming community with diminishing profit. Recently, climate change with erratic rainfall and delayed monsoon arrival added more challenges for these areas in several places. Deficit soil moisture imposes stress on the crops and negatively affects the winter crops productivity in the rice-fallow system, and several times it results in complete crop failure (Singh et al., 2012; Ghosh et al., 2016).

4.1. Introduction

Globally, rice is cultivated on about 165 million ha of land, which provides around 787 million tons of paddy annually (FAO, 2023). In Asia, 708 million tons of paddy is produced from nearly 143 million rice-cultivated areas. Rice crop is grown in a wide range of climates, varied soil types, and hydrological situations. Rice is the lone cereal crop that grows well in floods.

The rice habitat can be divided into four groups based on the hydrology of the rice field: irrigated lowland rice (79~80 million ha), rainfed lowland rice (54~55 million ha), upland rice (14~15 million ha), and flood-prone rice (11~12 million ha) (Table 4.1) (Bouman et al., 2006).

3.1. Introduction

Rice is grown in varying geographical locations and climatic situations. Most of the rice area lies between the equator and 400 N latitude and between 700 and 1400 E longitude. It grows well from tropical to sub-tropical warm and temperate climatic regions up to 400 S and 500 N of the equator. However, the highest yields are obtained in the region between 300 and 450 N of the equator. The average yield generally increases as the countries are situated further away from the equator (Chatterjee and Maiti, 1985). In India, rice grows in regions from 80 N to 350 N latitudes under widely varying conditions of the land, rainfall, altitude and climatic conditions. It is grown at the sea level in river deltas as in parts of Kerala, as deepwater in states of West Bengal, Assam and Bihar; at high altitudes of 914 to 1524 m or even more as in Kashmir, and in the slopes of the Himalayas. A temperature range of 200 C to 37.70 C is required throughout the life period of rice crop.

2.1. Introduction

Water plays a pivotal role in this earth system. The withdrawal of water for irrigation is about 70% of the global freshwater. Water use efficiency is less than 50% in many countries. It has been forecasted by the Food and Agricultural Organization (FAO, 2015) that global water requirements will be increased by 50% by the year 2050 to meet the demands of agricultural water use. This is so because food demand will be higher for the growing human population. We have entered into an earth system where everything living has evolved and developed (Cosgrove and Loucks, 2015). There has been a new geological scenario, some say Anthropocene (Crutzen, 2002; Williams et al., 2011). Consequently, freshwater will increasingly be a scarce and the costliest resource in the future, which needs to be managed properly.

1.1. Introduction: India’s present population, growth rate & projections

India is the second-most populous country in the world after China with its population of about 1.38 billion in the year 2020. The Population Division under the Department of Economic and Social Affairs, of the United Nations, has projected the country’s population to be growing to about 1.50 billion by the year 2030, and 1.64 billion by 2050, of course with its decreasing annual growth rate from 1.04 to 0.25% or so during the period of next thirty years (Fig. 1.1; UNDESA, 2019). The projection says the Indian population will exceed China by the year 2030 even with its decreasing rate i.e. India will be the most populous country by then. As agriculture and allied sectors are the backbone of this country and the largest livelihood source, it support this growing human and livestock population with diversified natural resources and varied agro-climatic conditions. However, the sustainability of agricultural production should be maintained in the face of perturbation and stress on the agro-ecosystem especially the degraded natural resource base and changing climate.

6.1. Introduction

The growing human population presents a number of issues, including food scarcity, malnutrition, inadequate natural resources (land and water) for agricultural production, and environmental deterioration (MacDonald, 2010). Today, viable intensification of agri-production systems can fulfill rising food, nutrition and environmental demands (Pretty and Bharucha, 2014). Production of rice (Oryza sativa L.), a vital element of food security, which feeds nearly half of the world's population, occupies 143 million hectares of land (FAOSTAT, 2023), and uses up to 90% of all irrigation water in Asia (Liu et al., 2018). For instance, it has been determined that systems for producing rice are one of the main industries that wastes water resources and greatly increases greenhouse gas emissions (FAO, 2013). Therefore, it is necessary to look for ways to manage the rice production system more effectively. In paddy rice systems, co cultivating aquatic animals (fish, shrimp, crab, shellfish, and ducks) and rice has been suggested as a way to reduce the risks of environmental pollution/ contamination linked with rice production while simultaneously optimizing the use of land and water resources to provide humans with both grains and meat (Hu et al., 2016; Ahmed and Garnett, 2011). Co-culture systems have drawn more interest recently due to their potential to reduce the stresses associated with environmental and food insecurity.

Plant Relationship with Soil in Climate Change

1. Gravimetric Moisture

Significance of Gravimetric Analysis

Gravimetric moisture analysis, being the foundation of soil water assessment, allows for a meticulous examination of the water content in the soil. The process involves obtaining a representative soil sample, subjecting it to controlled drying conditions, and determining the weight loss after moisture removal. This method not only quantifies the total water content but also helps in understanding the soil’s water-holding capacity and drainage characteristics. Gravimetric analysis is indispensable in precision agriculture, aiding farmers in optimizing irrigation schedules and preventing overwatering or underhydration.

1. Monsoon: Types and Behavior in India

The monsoon is a dynamic and vital climatic phenomenon in India, playing a pivotal role in shaping the country’s weather patterns, agricultural practices, and overall water resource management. This seasonal shift in wind patterns brings about distinct wet and dry periods, impacting various regions differently. Understanding the types and behavior of the monsoon is essential for effective planning and adaptation to this critical aspect of India’s climate (fig 1).

Types of Monsoon in India

1. Southwest Monsoon (June to September)

The southwest monsoon is the lifeline of India’s agriculture, bringing the much needed rainfall that supports a majority of the country’s crops.

1. Introduction

1.1 Background

The historical backdrop of irrigation is rich and diverse, reflecting the ingenuity of civilizations in adapting to their environments to meet the basic human need for sustenance. Ancient cultures such as the Sumerians, Egyptians, and Chinese were pioneers in developing rudimentary irrigation systems, channeling water from rivers, and constructing canals to nourish their crops. These early practices laid the foundation for the evolution of irrigation, marking a significant transition from relying solely on rainfall to actively controlling water distribution.

1. Introduction to Agroforestry

Agroforestry stands at the intersection of agriculture and forestry, embodying a holistic approach to land management that harnesses the synergies between trees, crops, and livestock. At its essence, agroforestry transcends conventional farming practices, weaving together the ecological, economic, and social dimensions of sustainable land use.

Defining Agroforestry

In the tapestry of agroforestry, the definition extends beyond the mere coexistence of trees and crops; it embodies a philosophy of intentional and symbiotic relationships. Agroforestry is a deliberate and dynamic land-use strategy where trees are integrated into agricultural systems, fostering mutually beneficial interactions.

1. Introduction to Organic Farming

Definition and Principles of Organic Farming

Organic farming is not merely a set of agricultural practices; it is a profound philosophy that seeks to redefine humanity’s relationship with the land. At its core, organic farming is an intricate dance with nature, a commitment to fostering biodiversity, ecological balance, and sustainability.

Defining Organic Farming

Organic farming is a departure from conventional agricultural methods that rely heavily on synthetic inputs. It is an agricultural system that embraces natural and traditional approaches to cultivation.

1. Land Degradation- Type, Factors, Distribution, Processes, and Impacts on Soil Productivity

A. Types of Land Degradation

1. Soil Erosion: Soil erosion, a pervasive form of land degradation, manifests through the detachment and transportation of soil particles by various agents like wind and water. Wind erosion is common in arid regions, where dry, loose soil is susceptible to being carried away by the wind. Water erosion, on the other hand, occurs through surface runoff and can lead to gully formation and the loss of fertile topsoil. This loss of topsoil directly impacts agricultural productivity by reducing nutrient availability and water retention capacity.

1. Concept of Conservation Farming

Conservation farming represents a paradigm shift in agriculture, moving away from conventional practices that often degrade the environment and compromise long-term productivity. Expanding on the principles of conservation farming provides deeper insights into the multifaceted benefits and challenges associated with this approach.

Conservation farming aligns closely with the principles of agroecology, emphasizing the integration of ecological concepts into agricultural systems. The concept recognizes that agriculture is not separate from the natural environment but rather an integral part of it. By minimizing soil disturbance, conservation farming promotes the preservation of soil structure and the intricate network of microorganisms that contribute to nutrient cycling and plant health.

1. Wasteland

Introduction

In the vast tapestry of Earth’s landscapes, certain areas have been relegated to the sidelines, deemed unproductive and often dismissed as wastelands. However, the term “wasteland” carries a complexity that extends beyond mere barrenness; it encapsulates a narrative of neglect, degradation, and, crucially, the latent potential for transformation.

The Dynamic Nature of Wasteland

At its core, a wasteland is a geographical space characterized by low productivity, often manifesting in barren, unproductive landscapes. The term, however, fails to encapsulate the dynamic and evolving nature of these areas. Wastelands can result from a confluence of natural processes and human activities, making them heterogeneous entities requiring careful examination (fig 1).

1. Introduction to Water Resources in Agriculture

Water, the quintessential life force for agriculture, intricately intertwines its significance throughout the fabric of global farming practices.

1.1 Significance of Water in Agricultural Practices

1.1.1 Sustenance of Plant Life

• Beyond its role as a life sustainer, water emerges as the very essence that propels plant development. It acts as the vital catalyst for photosynthesis, the engine of plant growth. This intricate process is the heart of the plant’s ability to convert sunlight into energy, driving robust development from seed germination to harvest.

1.1.1 Definition and Scope of Soil Science

Definition: Soil science encapsulates the scientific exploration of one of Earth’s most vital components—soil. It goes beyond the everyday understanding of soil as mere dirt, positioning it as a dynamic and complex system that supports life. At its core, soil science is an amalgamation of various scientific disciplines, each contributing to the comprehensive study of soil. This multidisciplinary approach ensures a holistic understanding that extends far beyond the surface.

Soil science is not confined to the physical substance beneath our feet; rather, it embraces a nuanced perspective that involves decoding the intricate language of the soil. It is the science of uncovering the secrets embedded in the Earth’s outer layer—examining its history, composition, and the myriad interactions that shape its character

Introduction

The rhizosphere plays a pivotal role in the boundary where biological and chemical activities profoundly impact various landscape and global-scale processes. Understanding these processes is crucial for maintaining planetary health and sustaining the organisms inhabiting it (Morrissey et al., 2004). To enhance the yield potential of staple food crops, leveraging the root systems of plants becomes essential to meet the anticipated doubling of global food demand in the future (Gewvin, 2010; Zhang et al., 2010). Amidst the challenges posed by global climate change and the burgeoning global population, there’s an increasing need for greater productivity from cultivated food, animal feed, and fibers on less favorable and often infertile lands—conditions already prevalent in many developing nations (Tilman et al., 2002). Advancing our understanding and control of rhizosphere processes stands as a critical frontier in research for the next decade.

Introduction

Increasing fresh water demands for ever growing population and it has increased by 600% over the past 100 year (Wada, et. Al, 2016) the annual increment rate 1.8 % whereas the present growth rate is less, only 1 % but this figure may be optimistic. The global water demands will grow significantly over the next two decades in all three components as: Industry, domestic and agriculture (U.N, 2018) industry and domestic demand will grow faster than agriculture, but agriculture demands will remain largest (U.N, 2018). The global water demands for all purpose will increase 20% to 30% by 2050, up to 5,500 to 6,000 km3 per year (Burek et.al, 2016), whereas, agricultural demands will increase by 60% by 2025 (Alexandrators and Bruinsma, 2012).

Introduction

Agroforestry being old as an art and new in its scientific terms has been gaining importance in the modern era due to shift of world from technology to nature in search of resilient way of sustaining livelihood (Dutta et al., 2023, Sharma et al., 2023 Bishaw et al., 2022, Agnoletti et al., 2022). The simplicity of the agroforestry system is the flagship reason of its widespread applicability and reliability in agricultural domains. There has been change in the world perspective regarding the nature and natural resources in recent times. Although there has been forest over 31 per cent of the world’s total geographical area (FAO and UNEP, 2022) but the stabilization of ecosystem and sustainable development is difficult without subsequent interaction between the tree, crop and livestock component on farm lands, being collectively called as agroforestry.