eChapters

Poisoned food technique

The principle involved is to poison the medium with fungi toxicants and then allow a test fungus to grow on such medium. The test may be performed both on solid and liquid medium.

Procedure

On solid medium

•Prepare potato dextrose agar medium.

•Add required amount of fungicide and thoroughly mixed.

•The medium is poured into sterilized Petri-plates.

•A culture of test fungus is grown on PDA for a certain period (generally seven days) at the optimum temperature for growth.

•Small disc (7 mm) of fungus culture is cut with sterile cork borer and each Petri plates are centrally inoculated aseptically containing the medium with desired fungicidal concentration.

•Suitable checks are kept where the culture discs are grown under the same conditions on PDA without fungicide.

•The fungal colony diameter is measured at every 24 hr.

Transfer of technology is closely associated with generation of technology and its use leading to development. Extension components contain stimulating inputs that would mobilize the practitioners to put recommendations into action. Sustainability in agriculture is very important component of present day agriculture and future aspirations. Keeping these aspects in view an attempt was made to enlist suggestions under extension approaches that would enhance sustainability in agriculture in the area under study. The suggestive extension measures to enhance sustainability in agriculture were studied under components of social structure, cooperation mechanism, evaluation technique and marketing network.

A system is a unit which possess a group of interacting components, operating together for a common purpose, capable of reacting as a whole to external stimuli. It is unaffected directly by its own outputs and has a specified boundary based on the inclusion of all significant feedbacks. For example, the human body is a system-it has a boundary (skin) enclosing a number of components (heart, lungs) that interact (the heart pumps blood to the lungs) for a common purpose (to maintain and operating the living body).

Ecosystem: Any collection of organisms that interact or have the potential to interact along with the physical environment in which they live form an ecological system or ecosystem. Ecosystems are not static entities but, they are dynamic systems with characteristic pattern of energy flow, nutrient cycling and structural change.

Agro ecosystem: Agro ecosystems are ecological systems modified by human beings to produce food, fibre or other agricultural products. Like the ecological systems, agro ecosystems are structurally and dynamically complex. But their complexity arises from the interaction between socio economic and ecological processes.

Crop system: An arrangement of crop population that transform solar energy, nutrients, water and other inputs into useful biomass that produce food, feed, fuel and fibre. Crop system comprise of soils, crop, weed, pathogen and insect subsystems. The crop can be of different species and variety, but they only constitute one crop system if they are managed as a single unit.

Cropping systems: It is defined as the order in which the crops are cultivated on a piece of land over a fixed period of time. Cropping system is the way in which different crops are grown. In the cropping systems, sometimes a number of crops are grown together or they are grown separately at shorter intervals in the same field.

Boron occurs as anion in soils and isrequired by plants in very small quantity. Water soluble B makes the estimate of its availability to plants. Total boron in soils varies from 20 to 200 mg kg^-1 and available (water soluble) boron in soils ranges from 0.03 to 12 mg kg^-1 respectively. The threshold value ranging from 0.1 to 0.5 mg kg^-1 (water soluble B) depends upon the soil type, crops, and other factors, below which the response to applied boron may be expected. Its availability is affected by soil pH as under:

EXPERIMENT

TECHNOLOGY FOR EXTRACTION OF KERNEL OIL FROM STONE FRUITS

Apricot, peach, plum, cherries, nectarines etc are the important stone fruits belonging to the family Rosaceae. These fruits are known to contain stones/pits i.e., apricot (6.0-11.5%), peach (7.5-11.5%), plum (4.5-7.0%) and these stones are reported to contain kernels (%) apricot (28.0-32.0%), peach (5.7-5.9%), plum (10.0-20.8%), almond (28.0-30.0%). These kernels can yield an oil yield of (42.5-45.5%), (38.5-41.5%), (39.2-40.6%) and (52.0-58.9%), respectively. Thus, these stone fruit kernels can be utilized for extraction of kernel oil by using the improved technology developed for extraction of oil. The developed technology consists of mechanical decortication of stones by the use of mechanical decorticator, kernel separation by using specific gravity separation technique, oil extraction by using table oil expeller and oil filtration through oil filter press followed by packing in PET bottles and PE pouches.

Mechanical decorticator: The mechanical decorticator is a type of roller crusher consisting of two rollers moving in inward opposite directions with the help of 3 HP motor and is provided with a hopper and feeder assembly. The clearance between two rollers is adjusted according to the respective size of stones.

Table oil expeller: Oil expeller is a 24 patti screw type oil expeller driven by 7HP motor, in which the kernels are fed into the moving hopper at pre-determined flow rate, which are pressed in between rollers (worm) and side walls of the expeller. The kernels are then, passed through the expeller 3-4 times until a thin slice of press cake is obtained.

Physiological plant disorder is caused by non-pathological conditions such as poor light, weather damage, waterlogging or lack of nutrients affect the operation of the system caused. Physiological condition selected from diseases caused by plant pathogens such as viruses or fungi to distinguish. Although the physiological disorder symptoms may occur such as disease, they can often be prevented by changes in environmental conditions. However, once the nutritional deficiencies of plants showing symptoms, is likely to return that season yield will be reduced.

Vitamins and minerals play crucial roles in supporting immune function across various animal species. Their supplementation can enhance immune responses, reduce disease susceptibility, and improve overall health. The appropriate doses vary depending on species, physiological state, and environmental conditions.
Cattle
1. Vitamins
Vitamin A: Enhances mucosal immunity; 30,000–50,000 IU/day.
Vitamin D: Supports macrophage function; 10,000–15,000 IU/day.
Vitamin E: Antioxidant, improves phagocyte function; 500–1,000 IU/
day.
2. Minerals
Zinc: Promotes wound healing and immune cell activity; 40–60 mg/kg feed.
Enhances neutrophil and antibody responses; 0.3 mg/kg feed.
Sheep and Goats
1. Vitamins
Vitamin A: 5,000–10,000 IU/day.
Vitamin E: 200–400 IU/day to enhance antioxidant defenses.
Vitamin D: 2,000–3,000 IU/day to maintain calcium balance and immunity.

Biogas typically comprises 60-65% methane (CH4), 35-40% carbon dioxide (CO2), and 0.5-1.0% hydrogen sulfide (H2S), along with traces of water vapor. It is approximately 20% lighter than air and has an ignition temperature of 650-750°C. The calorific value of raw biogas is around 20 MJ/m³ (4,713 kcal/m³).
Unlike Liquefied Petroleum Gas (LPG), biogas cannot be converted into a liquid state under normal temperature and pressure. The critical temperature for methane liquefaction is -82.1°C at a pressure of 4.71 MPa, making liquefaction complex and energy-intensive. However, biogas can be upgraded by removing impurities like CO2 and H2S and compressing it into cylinders for use in three-wheelers, cars, pickup vans, or stationary engines at remote locations.
Since Compressed Natural Gas (CNG) technology is already wellestablished, upgraded biogas (also called biomethane) which has similar composition and energy content can serve as a direct substitute for CNG in all its applications. The calorific value of upgraded biogas (with CO2 removed) increases to around 34 MJ/m³, compared to 20 MJ/m³ for raw biogas.
Techniques for Biogas Purification
To enrich biogas and increase its methane content, various purification methods are employed:
1. Water Scrubbing
This physical absorption process involves pressurizing biogas and feeding it into the bottom of a packed column, while water is introduced at the top. The CO2 and H2S dissolve into the water as it flows downward, while methane rises and is collected. The water used can

Introduction

Rural development focuses on development of rural man, woman and all things. Rural development influences the growth of economy in rural areas. Rural development mainly depends on agriculture. This agriculture reduces hunger in rural areas and increases food security. Bondad-Reantaso et al., (2009) showed for rural development aquaculture act as a indicator. Brummett and Williams (2000) showed rural development of aquaculture in Africa.

Role of poverty alleviation by aquaculture

(a) Aquaculture creates employment in rural area

(b) Aquaculture gives nutrition to infants and women

(c) Vale of aquaculture is comparatively high.

(d) Rural people may income by selling the fish seed.

(e) Landless people can cage culture, mollusks culture in very short place.

Aquaria, commonly known as fish tanks, are mainly categorized by the type of water they use—freshwater, brackish, or marine—and the kind of habitat they aim to recreate. They may also be classified by size, function, or the species they are intended for. Generally, aquaria fall into categories based on water composition, user intent, and maintenance complexity.
Freshwater aquaria are the most widely kept due to their simplicity and suitability for beginners. These tanks typically house species like guppies, mollies, and goldfish. Brackish water aquaria contain water with intermediate salinity, ideal for species such as archerfish and scats, requiring specific care conditions. Marine aquaria, designed for saltwater organisms like clownfish and coral, demand precise salinity levels and advanced filtration systems, making them more challenging to maintain.
By purpose, aquaria include community tanks, which accommodate multiple compatible species, and species-specific tanks, dedicated to observing the behavior and breeding patterns of a single species. Breeding tanks are specialized setups designed for reproduction and fry care, ensuring optimal water quality and feeding conditions. Planted aquaria focus on cultivating live aquatic plants alongside fish, combining aesthetic appeal with ecological stability.
Additionally, commercial aquaria are typically large-scale setups used in public displays, pet trade, or scientific studies. In contrast, domestic aquaria are maintained at home for personal recreation or hobbyist-level breeding activities.

INTRODUCTION
The fuel system in a tractor engine is essential for providing the engine with the right amount of fuel to enable efficient combustion. Its primary function is to guarantee a steady and reliable flow of clean, properly atomized fuel, which is crucial for achieving optimal performance and fuel efficiency. The system consists of various components that collaborate to manage different processes such as storing, filtering, and delivering the fuel to the combustion chamber.
These processes must work in harmony to ensure the engine operates smoothly, maintaining both power output and efficiency. Proper atomization of the fuel ensures that it mixes well with air, allowing for more complete combustion and minimizing the chances of fuel wastage or emission of harmful substances. From fuel storage tanks to injectors, every part of the fuel system is designed to meet the demands of the engine under various operating conditions.
A well-functioning fuel system helps maintain engine longevity, reduces fuel consumption, and ensures that the engine can perform at its best across different workloads and environments.
Fuel is a substance consumed by the engine to produce power. The common fuel for Internal Combustion engines are
1. Petrol
2. Power kerosene
3. High speed diesel
Calorific value of fuel
The heat liberated by combustion of a fuel is known as calorific value or heat value of the fuel. It is expressed in kcal/kg of the fuel

Microbiology

Study of microorganisms, a large and diverse group of microscopic organisms, that exist as single cell or cluster. It also includes virus, which are microscopic, but not cellular.

When crops are grown in either intercropping or sequential cropping interaction between different component crops occurs which is essentially a response of one species to the environment as modified by the presence of another species is commonly referred to as interference or interaction.

The interaction are classified into three groups

1. Competitive interaction: One species may have greater ability to use the limiting factor and will gain at the expense of the other and this is called competitive interaction or when one or more growth factors are limiting, the species that is better equipped to use the limiting factor(s) will gain at the expense of the other and this is called competitive interaction.
2. Non competitive: If the crops are grown in association and the growth of either of the concerned species is not affected, such type of interaction is called non competitive interaction or if resources (growth factors) are present in adequate quantities, as a result of which, the growth of either of the concerned species is not affected, then it is non-competitive interaction or interference.
3. Complementary: If one species is able to help the other, it is known as complementary interaction or if the component species are able to exploit growth factors in different ways (temporal or spatial) or if one species is able to help the other in supply of factor (like legumes supplying part of N fixed by symbiosis to non-legumes), it is complementary interaction or interference and also referred to as Annidation.

Introduction

Chestnut (Castanea sativa Mill.) belongs to the family Fagaceae and is a deciduous tree. It is also known as sweet chestnut and has a chromosome number of 2n=24. Chestnuts have been used for centuries for various purposes such as food, timber, and medicine. They are an important source of carbohydrates and contain several nutrients such as vitamins, minerals, and fiber (Laribi et al., 2020). In India, chestnuts are mainly grown in the hilly regions of Jammu and Kashmir, Himachal Pradesh, and Uttarakhand.

Origin and distribution

Chestnut is believed to have originated in the Mediterranean region and was later introduced to other parts of the world. It is widely grown in Europe, Asia, and North America. In India, chestnuts were introduced by the British in the 19th century and were mainly grown as an ornamental tree. It was only after Independence that chestnuts were recognized as a potential crop for the hilly regions of the country (Bhat et al., 2016).

Area and production

The total area under chestnut cultivation in India is estimated to be around 1000 hectares, with an annual production of around 1000 metric tons (Bhat et al., 2016). The major states growing chestnuts are Jammu and Kashmir, Himachal Pradesh, and Uttarakhand.

Principle

Dried milled samples are extracted successively with diethyl ether, 0.5 percent ammonium oxalate solution, NH₂SO₄ and 72 percent sulphuric acid. Soluble carbohydrate in the ammonium oxalate extract determined with anthrone and hydrolysed pentosans and hexosans in the combined N H₂SO₄. Seventy two percent sulphuric acid extract are determined with aniline acetate and chromotropic acid respectively. The method gives a maximum variation of 4 percent from the mean of duplicates with each carbohydrate component. The residual material is ashed to obtain crude lignin and a nitrogen correction applied.

Soluble carbohydrate - this group, which includes sugars, oligosaccharides, and the fructosans of grasses, provides a source of nutrients  readily available to livestock.

Principle

Dried milled samples are extracted successively with diethyl ether, 0.5 percent ammonium oxalate solution, NH₂SO₄ and 72 percent sulphuric acid. Soluble carbohydrate in the ammonium oxalate extract determined with anthrone and hydrolysed pentosans and hexosans in the combined N H₂SO₄. Seventy two percent sulphuric acid extract are determined with aniline acetate and chromotropic acid respectively. The method gives a maximum variation of 4 percent from the mean of duplicates with each carbohydrate component. The residual material is ashed to obtain crude lignin and a nitrogen correction applied.

Soluble carbohydrate - this group, which includes sugars, oligosaccharides, and the fructosans of grasses, provides a source of nutrients  readily available to livestock.

Radiant energy (Q_e, J): The transfer of energy of radiation.

Radiation frost: Heat radiated from surface of soil, trees, and any other solid particles to reduce the temperature low enough to cause frost conditions. Solid particles lose heat more rapidly than air, reducing the surface temperature. Eventually the air at low levels becomes cool and heavy compared to air at higher elevations. Occurs more readily on cloudless nights when there is no barrier for retaining the heat (i.e., a barrier that radiates the heat back to earth).

Radiation: The emission and propagation of electromagnetic waves or particles through space or matter.

Radical (Free Radical): An atom or a group of atoms with an unpaired electron which can exist independently for short period during the course of chemical reaction.

Radicle: Embryonic root of seed plants.

Introduction

Blackberry (Rubus fruticosus L.) belongs to the family Rosaceae and is a perennial fruit crop that is widely cultivated in different parts of the world due to its high nutritional and medicinal values. The fruit is known by different names such as bramble, dewberry, and thimbleberry, and has a chromosome number of 2n=14. Blackberry is a rich source of vitamins, minerals, antioxidants, and dietary fiber, and has potential health benefits in the management of various diseases such as diabetes, cancer, and cardiovascular disorders (Kumar et al., 2018). The fruit is consumed fresh and also processed into jams, jellies, juices, wines, and other value-added products.

Origin and distribution

Blackberry is believed to have originated in Europe and Western Asia, and was introduced to North America by early European settlers. The fruit is now widely cultivated in different parts of the world including Asia, Africa, Australia, and South America (Arya et al., 2020). In India, blackberry cultivation is gaining popularity in states such as Himachal Pradesh, Jammu and Kashmir, and Uttarakhand, where the climatic conditions are favorable for its growth and development.

Human Development and Family Studies has been prepared to strengthen conceptual understanding and examination readiness among students of community science and related disciplines. The book presents objective questions covering lifespan development, developmental challenges, early childhood care and education, guidance and counselling, marriage and family dynamics. Answer keys enable learners to assess their knowledge and identify areas requiring further study. A theoretical section provides a concise outline of important topics, supporting systematic revision and classroom instruction. The book is intended for undergraduate and postgraduate students, teachers and candidates preparing for university and competitive examinations in human development, family studies and early childhood education.

Introduction

Raspberry, scientifically known as Rubus idaeus L., belongs to the family Rosaceae. It is also known as “red raspberry” or “European raspberry,” and its chromosome number is 2n=14. Raspberry is an important and popular fruit crop due to its rich flavor, high nutritional value, and various medicinal properties. Raspberry is rich in vitamins, minerals, dietary fiber, and antioxidants, making it a valuable component of a healthy diet (Rahman et al., 2020). Raspberry is widely used in the food industry for jam, jelly, juice, ice cream, and other processed products.

Origin and Distribution

Raspberry is believed to have originated in Eastern Europe and Western Asia (Farrar, 2016). Raspberry was introduced to India during the British era and was initially cultivated on a small scale in the hilly regions of the country. Today, raspberry cultivation has spread to various parts of India, including Himachal Pradesh, Jammu and Kashmir, Uttarakhand, and Sikkim. The major raspberry-growing states in India are Himachal Pradesh and Jammu and Kashmir.