eChapters

The presence of water in its various phases (gas, liquid, and solid) within the atmosphere plays a pivotal role in shaping our weather and climate.This chapter, „Water Vapor in the Atmosphere,“ will delve into the crucial concept of atmospheric humidity – the amount of water vapor in the air. Water, unique in its ability to exist in all three states at Earth‘s temperatures, undergoes phase changes that are fundamental to the formation of clouds, precipitation, and atmospheric stability. Understanding the sources of atmospheric moisture, the ways it is measured and expressed, and its influence on atmospheric processes is essential for comprehending a wide range of meteorological phenomena. We will explore concepts such as evaporation, condensation, humidity indices, and the role of moisture in energy transfer within the Earth-atmosphere system. Join us as we unravel the dynamics of this vital component of our atmospheric environment.
8.1. Expressions Used for Water Vapor in the Atmosphere
The concepts of vapor pressure, saturated vapor pressure, vapor pressure deficit, and dew point has been discussed with detailed explanations:
8.1.1. Vapor Pressure (e)
Vapor pressure is the partial pressure exerted by water vapor molecules in the air. It represents the contribution of water vapor to the total atmospheric pressure. Imagine air as a mixture of gases; the vapor pressure is the „pressure“ exerted solely by the water vapor component of that mixture.

Nano-biofertilizers (NBFs) represent an emerging and sustainable approach to improving soil nutritional security and crop productivity in modern agriculture. By integrating beneficial microorganisms with nanomaterials, nano-biofertilizers overcome several limitations associated with conventional fertilizers and biofertilizers, such as low nutrient use efficiency, nutrient losses through leaching, poor microbial survival, and environmental pollution. This chapter provides a comprehensive overview of the role of nano-biofertilizers in enhancing soil fertility, nutrient availability, plant growth, and stress tolerance. The mechanisms underlying improved nutrient use efficiency, soil physical and chemical properties, plant physiological stability, and resistance to abiotic and biotic stresses are discussed in detail. The application of nano-biofertilizers in conventional and precision agriculture systems, including sensor-based variable rate application, fertigation, and data-driven nutrient management, is highlighted. Additionally, various application methods, environmental benefits, and challenges related to safety, scalability, regulation, and farmer adoption are critically examined. Overall, nano-biofertilizers hold immense potential to revolutionize sustainable agriculture by promoting efficient nutrient management, enhancing crop resilience, and minimizing environmental impacts, thereby contributing to long-term food security under changing climatic conditions.

Forecasting crop diseases based on the movement of weather systems is a critical component of modern agriculture, enabling farmers and agricultural stakeholders to take proactive measures to prevent or mitigate the impact of disease outbreaks on crop yields and quality. The relationship between weather patterns and crop disease transmission is complex and multifaceted, with various weather factors influencing the development, spread, and severity of crop diseases. (Fig. 14.1). Weather systems, including high and low-pressure systems, fronts, and wind patterns, play a significant role in the spread of crop diseases. For instance, wind currents can transport fungal s3pores, bacteria, and viruses over long distances, facilitating the spread of diseases such as powdery mildew, rust, and leaf spot. Additionally, weather conditions like temperature, humidity, and precipitation can affect the growth and development of crops, making them more susceptible to disease. Recent advances in meteorology, plant pathology, and data analytics have enabled researchers to develop predictive models that can forecast crop disease outbreaks based on weather patterns. These models use historical weather data, disease surveillance data, and crop phenology data to identify patterns and correlations between weather systems and disease outbreaks.

Botanical Name: Hevea brasiliensis
Family: Euphorbiacace
Origin: Brazil
Chromosome No.: 36
Useful Part: Latex 
Cera Rubber: Manihot glaziovii
Para Rubber: Hevea brasiliensis
Indian Rubber: Ficus elastic
Panama Rubber: Castiolla elastic
Guayul Rubber: Parthenium argentatum

R - Enamel can: The acid resistant, gold coloured enamel treated can are called R enamel cans. It is used for canning of acidic food which have soluble colouring pigments.

R value: R value is a measure of resistance to the flow of heat through a given thickness of a material (insulation) with higher numbers indicating better insulating properties.

Rabbitto and putridity: The surface taint of the milk caused by Pseudomonas putrefaciens is called rabbitto and putridity.

Racking: An important operation for the wine production in which wine is siphoned off and is transferred to a fresh vat with the help of a false bottom. Racking is repeated decanting to remove the slowly setting cloud of the freshly fermented young wine. It is also called clarification. It is synonym to siphoning.

Rad: It is the unit of radiation dose being equivalent to the absorption of 100 erg/g of irradiated material.

Radappertization: It means complete sterilization of foods by using irradiation. It is equivalent to commercial sterility. High dose of the radiation (25-45 kGy) is required for killing all microbes.

Test for Significance for Population Mean
    
Test for Significance of Population Proportion

7.1 Introduction

This chapter describes the development of data logger of agricultural field parameter monitoring system with MATLAB. The system comprises of Arduino, water level sensor, humidity sensor, light sensor, soil moisture sensor, temperature sensor, smoke detector, power supply, PC with MATLAB. The system is designed to monitor the environment and agriculture field parameters. The field device is designed to collect all physical parameters and same is communicated serially to MATLAB with I/O package. Fig.7.1 shows block diagram of the system. Table.7.1 shows the component list required to develop the system.

12.1 Introduction

Farm ponds are used for multipurpose including as a viable source for supplemental irrigation to rainfed crops, a good place of entertainment, a vital place for wild life habitats, livestock and fish and aquatic plants. Like any other structure, the farm pond needs regular repair and maintenance for effective operation. The purpose of construction of the pond will be fruitful and the life span of the pond will be enhanced if proper care and maintenance are taken. In this chapter some salient discussions on care and maintenance of the pond are mentioned.

12.2 Maintenance Against Silting

The farm ponds constructed in medium to deep black soils are subjected to getting silted up. Hence, periodic desilting to restore the original storage capacity is required. If the pond is used for supplemental irrigation to crops, then desilting may be done once in every 5 to 10 years depending on the amount of silt getting deposited in the pond.

The breaches and rill formed in the spoil bank and shoulder bunds should be immediately repaired. The inlet and outlet structures should be maintained periodically. The silt deposited in the silt trap should be removed periodically. In areas where silt carried by the runoff is more, a vegetative filter near the inlet structure may be used. The pond may be desilted manually if it is small in size otherwise mechanical measures may be used to desilt. It is easy to desilt the pond when it is dry. A Simple and inexpensive method to desilt the pond is to stir the water of the pond and then allow the desilted water move away from the pond through the outlet (Belgaumi, et. al., 1997). Fig. 12.1shows a badly maintained pond with excess silting and weed infestation causing severe reduction of its storage capacity.

Introduction

Soil is a dynamic natural body, characterized by high degree of spatial variability due to combined effect of physical, chemical or biological processes that operate with different intensities at different scales (Goovaerts 1998). Reports have shown that there is large variability in soil properties, crop yield, disease, weed etc., not only in large-sized fields (Godwin and Miller 2003,Vrindts et al. 2005), but also in small-sized fields (Bhattacharya et al. 2008). Therefore, knowledge of hydro-physical properties of soils is crucial for management practices for all kinds of agricultural practices for efficient utilization of input resources. Plant growth and development is highly related to soil hydro-physical properties, which not only depend on soil intrinsic textural and chemical characteristics (Hamza and Anderson 2005) but also on soil management.

Soil physical properties which change with the variation in soil structure include bulk density, total porosity, pore geometry (size distribution, shape, continuity and tortuosity), penetration resistance and aggregate stability, consequently affecting soil hydraulic properties such as water retention characteristics, plant available water capacity, infiltration capacity and saturated hydraulic conductivity. These soil properties are dependent on seasonal climatic conditions, management practices, crop development and biological activity (Reynolds et al. 2007). The hydro-physical properties of soils, i.e., water retention and water permeability in both saturated and unsaturated zones not only shape soil water balance but also decide the conditions for plant growth, development and yield. They also determine water availability for the plant root system and the transfer of water with chemical compounds dissolved in it into deeper layers.

With the culmination of green revolution, the yield in agriculture is almost static with the use of even great deal of inputs and resources with appearing decadence in nature. The agriculture, if continuous on with same trend, will no longer productive and sustainable. Heterogenity being vested with best survival and sustenance, attempt is underway towards crop diversification deploying remunerative crops and techniques so as to keep pace with rising demand of mankind. Added to this, dwindling land : man ratio (0.13 ha during 1990s), harvesting more return from a unit area of land, disguised unemployment, improper availability of fruits and vegetables (40 g and 120 g respectively as against 120 g and 280 g for fruits and vegetables, respectively), generating employment (143 man-days/ha in cereals, 860 man-days/ha in fruit production and 1000-2500 man-days/ha in cultural intensive fruit crops), are major concerns for high density planting (HDP). It is a holistic production system which helps in promoting and preserving dynamic agro-ecosystem. HDP is also an aid to biodiversity, biological cycles and organic farming. As an alternative to raise production and productivity especially to compete global trade, HDP is worth adoption.

Introduction

Colocasia esculenta (L.) Schott, also known as taro, belongs to the family Arecaceae. Taro is believed to have originated in Southern or South-East Asia, and to have been dispersed to Oceania through the Island of New Guinea to many centuries ago but cultivated in Asia for more than 10,000 years. Taro is considered as an important vegetable grown throughout India. Taro is herbaceous perennial plants with a large corm on or just below the ground surface and can be grown in the ground or in large containers. They can be grown in almost any temperate zone as long as the summer is warm.

Taro root contains very significant amount of dietary fibre and carbohydrates, as well as high levels of vitamin A, C, E, B6 and folate, as well as magnesium, iron, zinc, phosphorus, potassium, manganese and copper. Thogh negligible, the plant is also known to provide some protein in our diet. As Taro is a great source of fibre and other nutrients, it offers a variety of potential health benefits, including improved blood sugar management, gut and heart health.

Globally, taro is grown in an area of 1.6 m ha producing 11.66 mt with an average productivity of 7.25 t ha^-1 (FAO, 2009). The plant can be grown in wide range of climatic condition but during growth period taro is prone to attack by at least twenty- three (23) pathogens, of which, only a few causes serious reduction in the potential yield of the crop. Some of the mentionable diseases that commonly occurs and causes yield loss of the plants are as follows:

1. Introduction

The present library system has been designated as a treasure of knowledge in virtual environment. The concept of modern library has been considered as the source of high level-information using web technology, digitization, networking,e-resources and multimedia. The rapid development of modern information and communication technologies and smart usage of computers in library and information system and services has given rise to new generation of libraries. The last two decades have radically transformed the library system with new avenues of information transfer in virtual world. An incredible amount of growth in increasing new interfaces have been developed utilising latest technologies to optimise the delivery of contents and services in the context of web environment. The emerging new vision of library interfaces has involved web technologies, digital collection of texts and images, documents, genealogy of records and other materials of importance for the user community. The major shift of new technology has developed the subscription of e-journals, e-books, and e-databases collection in libraries. Such library interface is compelled to provide equal access to the contents or these collection to all users irrespective of area or locality. Another remarkable trend in library technology field is the emergence of open-source software movement that enabled to transform the automation and digital library interface. Open Source Software efforts such as OAI, Grenstone, DSpace, Koha etc, have drastically transformed the library technology scenario in terms of sophistication and functionality. This article/ chapter is dealt with the state of digital library system with stages of generation of digital libraries and future directions.

As we conclude this comprehensive review of the complex relationships between weather, crop diseases, and disease management, it is essential to reflect on the current state of knowledge and identify areas that require further research and attention. The preceding chapters have highlighted the significant impacts of weather factors on crop diseases, emphasizing the need for a deeper understanding of these relationships to develop effective disease management strategies. Significant work particularly on effects of different weather combinations on pathogen population and disease severity needs to be addressed well in time. Despite significant advances in our understanding of the weather-crop disease nexus, there remain substantial knowledge gaps that hinder our ability to predict and manage disease outbreaks effectively. For instance, the complex interactions between weather factors, crop physiology, and disease development are not yet fully understood, making it challenging to develop accurate predictive models. Furthermore, the impacts of climate change on weather patterns and crop diseases are still being researched, and more work is needed to understand these relationships fully. To address these knowledge gaps and improve our understanding of the weather-crop disease nexus, several action plans are required. Firstly, continued research is needed to elucidate the complex relationships between weather factors, crop physiology, and disease development. This research should focus on developing a deeper understanding of the underlying mechanisms driving these relationships, as well as identifying key weather thresholds that trigger disease outbreaks. Secondly, the development of accurate predictive models that can forecast disease outbreaks based on weather data is critical. These models should be able to account for the complex interactions between weather factors, crop physiology, and disease development, as well as incorporate data from multiple sources, including weather stations, satellite imagery, and field observations. Thirdly, there is a need for more effective communication and collaboration between researchers, policymakers, and farmers to ensure that research findings are translated into practical disease management strategies. This will require the development of user-friendly decision support tools that can provide farmers with timely and accurate advice on disease management, based on weather forecasts and other relevant data. Finally, addressing the impacts of climate change on weather patterns and crop diseases will require a coordinated effort from researchers, policymakers, and

Introduction

Majority of the commercially important freshwater prawns belongs to the genus Macrobrachium of family Palaemonidae. Among the commercially important freshwater prawns of India the most important cultivable species at present is the giant freshwater prawn Macrobrachium rosenbergii due to its superior cultivable attributes such as fast growth rate, large size, wide range of salinity tolerance, hardiness and compatibly to grow with carps. The species enjoys good consumer preference and domestic as well as export market demand. Freshwater prawns are cultured in freshwater or low saline brackish water (salinity <10 ppt) and can be cultured either alone (monoculture) or in combination with fishes such as carps, tilapia and milkfish (polyculture). Freshwater prawn culture can be carried out in earthen ponds, cement cisterns, in pens or in cages. However, most of the operations are being carried out in earthen ponds.

Two species mostly grown worldwide

1. Introduction

Much of humankind has either at least interacted with forests or benefited from forests for their lives and livelihoods. Approximately 1.6 billion rural people worldwide, mainly in tropical regions, depend upon forests in one form or the other. People rely on forests or forest services as sources of food, shelter, energy, building materials, fiber, fodder, income, medicine, and inspiration (Gabay and Rekola, 2019). The earlier efforts of international forest development practices were focused only on the production and industrial sector. Nonetheless, in the late 1970s and 1980s, this focus shifted to better understanding the links between people and forests. The same period has witnessed the birth of community-led (social/participatory) forest management in many countries. Women’s role in the forestry sector has also started to receive more attention and understanding during this time (FAO, 1986; Ginsburg and Keene, 2020; Kristjanson, 2020). Thus, gender roles have remained an area of interest in forest management, especially in developing countries, and the perspectives have evolved over the years. The agenda 2030 of the sustainable development goals (SDG) encompasses strategies designed to tackle gender inequities and protecting ecosystems, including forests, biodiversity, and oceans (UN, 2015). In fact, the interlinked trajectories of women and the environment have led to the emergence of the theory of ecofeminism and women environment and development (WED) in the late 1970s (Tyagi and Das, 2017). It integrates the ethics of ecology with feminism to explore the intangible interconnections between environmental degradation and sexist oppression (Warren, 1993). Though feminist discussions are not new to the forestry sector, attempts to generate gender-disaggregated data exclusively on forestry management perspectives have been scarce.

Introduction

The oceans account for 72% of Earth's total surface area and sustain the lives of billions of people. The oceans contain an abundance of both living and nonliving materials, and their depths contain aspects that have yet to be discovered. The oceans significantly affect our everyday weather and climate patterns, as well as the quality of the air we breathe and the water we drink. At this time, our understanding of the oceans is limited to relatively shallow depths. Exploration of the deep sea, which requires specialized modern equipment that is not commercially accessible at the moment, is necessary due to global security concerns involving oceans.

Introduction Soil management in horticultural crops refers to the deliberate and systematic approach of caring for soil to optimize its health, fertility, structure, and overall quality to support the growth and development of horticultural plants. It involves a range of practices aimed at preserving and enhancing soil resources, including soil testing, nutrient management, irrigation scheduling, erosion control, and organic matter addition. The goal of soil management in horticultural crops is to create and maintain an environment in which plants can thrive, maximizing crop yields, quality, and sustainability while minimizing environmental impacts such as soil erosion, nutrient runoff, and soil degradation. By implementing effective soil management strategies, horticultural growers can ensure the long-term productivity and viability of their farming operations, while also promoting soil health and resilience in agricultural ecosystems.

Current Soil Conditions

A study conducted in 2016 over 75 fields revealed that soil compaction was present in 70% of annual crops and 60% of perennial crops. Most of the soils used for both annual and perennial cropping were in a moderate condition. However, the soil condition for established crops was improved by performing cultivations before planting. Nevertheless, some soil formations exhibited instability, especially on soils with a lighter texture and a low content of organic matter. The majority of soil cultivations successfully alleviated compaction, however some cultivations had little impact or even exacerbated compaction due to spreading, puddling, or compression when performed in damp or wet field conditions. Tillage pans may greatly diminish productivity and overall efficiency of production by impeding drainage and root development. Approximately 60% of fields cultivating annual crops and 50% of areas cultivating perennial crops had a well-established tillage pan. Approximately 10% of fields underwent deep cultivation without any evidence of soil compaction, indicating a lack of consideration for soil conditions and the need for subsoiling. The abundance of earthworms in the topsoil may serve as a valuable measure of soil health, and is primarily influenced by the intensity of farming practices and the presence, nutritional value, and consistency of earthworm food sources. Earthworm populations exhibited a general scarcity in both annual and perennial crops, while they were relatively more plentiful in areas with ample crop waste and apple orchards. The regular tilling of the soil is believed to be a significant contributing factor to the very low population of earthworms found in places where crops are grown every year. Fields that had a mustard cover crop reported the greatest populations of earthworms.

10.1 Multiple transplanting for increasing papaya yield: Papaya seedlings are uprooted and transplanted at a different spot, then uprooted again and planted back at the same spot after fifteen days. This decreases the plant's height and enhances its productive phase (Banaskantha, Gujarat). Kodarbhai (1999).

10.2 Reducing mango flower drop by applying buttermilk and salt: To prevent mango flowers from dropping due to wind and disease, farmers dig a circular trench around the tree trunk during flowering, mix 60-80 liters of buttermilk with 2 kg of salt, and pour it into the trench. After absorption, fresh water is added, and the practice is repeated (Banaskantha, Gujarat). Dudhaji (1997).

10.3 Enhancing fruit set in papaya by inserting a nail in the stem: To induce fruiting in trees that flower but do not bear fruit, farmers insert nails (iron or wooden, 1-2 cm in diameter) into the stem about a foot high (Amreli, Gujarat). Sheldiya (1992).

10.4 Increasing yield of vegetables and fruits by using hair: Waste hair is collected and applied to vegetable, fruit, and ornamental crops. Hair is buried around plants in pits (1/2 kg for ornamental plants, 1 kg for fruit trees) one month after planting and 45 days before fruiting. For vegetables like tomato and brinjal, hair is dispersed during the last ploughing (Tamil Nadu). Subbiah (1998).

10.5 Lemon juice for higher lemon productivity: Farmers increase lemon productivity by spraying a solution of 100 ml lemon juice dissolved in 2 liters of water on lemon trees, ensuring all leaves are wet (Rajkot, Gujarat). Pethan (1997a).

Introduction
Crops play a crucial role in sustaining human life by providing food, fuel, feed, and other essential resources. However, both the changing global climate and human activities have significantly impacted crop production and productivity. Projections suggest that the world’s population will reach 9.6 billion by 2050, necessitating a 7% increase in agricultural output to meet the expanding needs (PRB 2020). Therefore, it is imperative to enhance agricultural productivity to address the growing food demands. To tackle challenges such as climate change, diminishing arable land, water scarcity, and various biotic and abiotic factors causing significant crop losses, innovative crop breeding technologies are urgently needed to boost agricultural productivity and promote sustainable development.
Presently, modern agriculture relies on crossbreeding, mutation breeding, and transgenic breeding as primary methods to enhance crop productivity and quality. Crossbreeding entails mating an elite recipient line with a donor line to generate offspring with desired traits, which are subsequently backcrossed with the recipient line over multiple generations to remove any unintended linked traits. However, this approach typically requires 8-10 years to introduce desired alleles and augment genetic diversity.