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The increasing global emphasis on sustainable and environmentally friendly energy alternatives has placed biofuels at the forefront of green energy innovation. Derived from agricultural biomass and organic waste, biofuels represent a promising substitute for conventional fossil fuels, particularly in agrarian economies where such feedstocks are abundantly available. Agricultural biomass includes crop residues such as rice straw, wheat husk, corn stover, sugarcane bagasse, and oilseed cakes. Meanwhile, organic waste comprises food waste, animal manure, municipal solid waste, and industrial organic residues. Converting these materials into biofuels not only reduces landfill burden and environmental pollution but also cuts down greenhouse gas emissions and promotes the development of rural and circular economies. A variety of biofuels—including biogas, bioethanol, biodiesel, biohydrogen, and syngas—can be produced through two major conversion pathways:
• Biochemical conversion, which involves microbial and enzymatic processes such as fermentation and anaerobic digestion.
• Thermochemical conversion, which includes pyrolysis, gasification, and combustion processes to transform biomass into energy-dense fuels.
Types of Liquid Biofuels
The term biofuel commonly refers to liquid fuels produced from recently living plant material, unlike fossil fuels derived from ancient biomass. Among these, ethanol and biodiesel are the most prevalent forms:
• Ethanol: A type of alcohol produced through fermentation, usually from sugar- or starch-based crops like corn, sugarcane, or cassava. Ethanol is used either as a fuel substitute or blended with gasoline to reduce carbon emissions in vehicles.
• Biodiesel: Produced through the transesterification of oils extracted from plants and seeds (such as soybean, sunflower, or palm), biodiesel is a renewable fuel that can be used in standard diesel engines. It offers a biodegradable, less polluting alternative to petroleum-based diesel.

6.1 Introduction

All separation procedures depend mainly on some physical characteristics of the compounds. It is relatively easy to separate compounds that have significantly different physical characteristics by simple techniques such as solvent extraction. If the various compounds are similar to each other in their molecular size, any slight difference in any one of their physical properties is exploited to achieve separation. The separation and purification of plant constituents is mainly carried out using one or other, or a combination of chromatographic techniques: Paper Chromatography (PC), Thin Layer Chromatography (TLC), Column Chromatography (CC), High Performance Liquid Chromatography (HPTLC), Optimum Performance Laminar Chromatography (OPLC), Gas Liquid Chromatography (GLC) and High Performance Liquid Chromatography (HPLC). One further technique, which has fairly wide application in phytochemistry, is electrophoresis.

All separation procedures depend mainly on some physical characteristics of the compounds. It is relatively easy to separate compounds that have significantly different physical characteristics by simple techniques such as solvent extraction. If the various compounds are similar to each other in their molecular size, any slight difference in any one of their physical properties is exploited to achieve separation. 

Introduction

Soil is the main source of nutrients for the plants. Soil also provides support for plant growth in various ways. Knowledge about soil health and its maintenance is critical to sustaining crop productivity. The health of soils can be assessed by the quality and stand of the crops grown on them. However, this is a general assessment made by the farmers. A scientific assessment is possible through detailed physical, chemical and biological analysis of the soils. Essential plant nutrients such as N, P, K, Ca, Mg and S are called macronutrients, while Fe, Zn, Cu, Mo, Mn, B and Cl are called micronutrients. It is necessary to assess the capacity of a soil to supply nutrients in order to supply the remaining amounts of needed plant nutrients (total crop requirement - soil supply). Thus, soil testing laboratories are considered nerve centres for nutrient management in crop production systems and plantation forestry.

Soils may have large amounts of nutrient reserves in them. All or a part of these reserves may not be of any use to crops because they may not be in plant-available form. For the purpose of estimation or analysis of plant-available soil nutrients, such methods are to be used that have been tested/verified for the correlation of nutrients extracted and their plant availability. This book describes internationally accepted and widely used methods. Apart from nutrients, soil pH estimation is also critical in the assessment of soil health. Generally, plants prefer soils that are close to either side of neutrality. However, there are acid- loving plants and also plants that can withstand high soil alkalinity. Hence, good yields and economic returns from farming are possible in acid and alkali soils. With proper amendments, still higher yields can be obtained in acid and alkali soils. Soil pH also has a considerable influence on the activity of soil micro-flora and on the availability of soil nutrients to crops. It is also important to estimate physical properties such as soil texture, structure, bulk density, soil colour, water content and soil temperature.

Abstract

Estimates of genetic parameters are needed for the prediction of breeding values and planning of selection strategies for desired genetic advancement. Even animal breeders feel lost when confronted with the huge set of different methods. This paper describes an overview of latest methods for the estimation of genetic parameters in a simplest possible way avoiding complex mathematical expressions.

Introduction

Irrigation water always contains some soluble salts irrespective of its source. The suitability of waters for a specific purpose depends on the types and amounts of dissolved salts. Some of the dissolved salts or other constituents may be useful for crops. However, the quality or suitability of waters for irrigation purposes is assessed in terms of the presence of undesirable constituents, and only in limited situations is irrigation water assessed as a source of plant nutrients. Some of the dissolved ions, such as NO₃, are useful for crops.

Sometimes, effluents and domestic sewage water is utilized for irrigating field crops. For using these water safely in the farming system, assessment of undesirable pollutants and organic and microbial constituents with regard to their suitability is fore-most important. Determination of organic constituents is generally carried out under two categories viz., (i) organic substances that quantify an aggregate amount of organic C and (ii) individual or specific organic substances, such as benzene, DDT, methane, phenol and endosulphan. Important determinations are the chemical oxygen demand (COD), which gives the total organic substances, and the biochemical oxygen demand (BOD), which gives the amount of total biodegradable organic substances in the water sample.

Organic material especially, seeds, grains, leaves, fruits and nuts contain prominently three groups of compounds. They are carbohydrates, proteins and fats/oils, mostly in that order. They also contain 3-5% minerals and smaller quantities of vitamins and other minor constituents. Cereal grains contain more of carbohydrates while oilseeds and nuts contain more oil. Tree nuts and even oilseeds may contain 30-50% protein while cereal grains contain 5-8% protein only. The starch and sugar contents of oilseeds may be less than 10% while the oil content of cereal grains ranges around 5%. The actual content and the composition of these groups of compounds really account for their quality as well as commercial value.

Seed is a basic input to raise the crop plants. Healthy seeds produces the healthy crop. However, the seed carries different pathogens either externally or sometimes internally in the seed to affect the seed emergence and healthy seedling growth. Therefore, the seed treatment with fungicides/bactericides, based on the infection of the pathogen, is highly essential to counter the attack and infection of these pathogens to the germinating seedlings.

Proper selection of a fungicide and its application at the correct dose and the proper time are highly essential for the management of plant diseases. The basic requirement of an application method is that it delivers the fungicide to the site where the active compound will prevent the fungus damaging the plant. The fungicidal application varies according to the nature of the host part diseased and nature of survival and spread of the pathogen. The method which are commonly adopted in the application of the fungicides are discussed.

1.Soil treatment

2.Seed treatment

3.Foliar or vegetative application

Proper selection of a fungicide and its application at the correct dose and the proper time are highly essential for the management of plant diseases. The basic requirement of an application method is that it delivers the fungicide to the site where the active compound will prevent the fungus damaging the plant. The fungicidal application varies according to the nature of the host part diseased and nature of survival and spread of the pathogen. The method which are commonly adopted in the application of the fungicides are discussed

1. Foliar or vegetative application
2. Soil application

Introduction

Diseases are a common occurrence on plants, often having a significant economic impact on yield and quality, thus managing diseases is an essential component of production for most crops. These fungicides are used because of three main reasons:

a.To control a disease during the establishment and development of a crop.

b.To increase productivity of a crop and to reduce blemishes.

c.To improve the storage life and quality of harvested plants and produce.

Application Methods

To protect the crop from fungal pathogens, fungicides are applied in various formulations (as dust, granules, gas and most commonly, liquid). They are applied to:

1.Seed treatment

2.Soil treatment

3.Protection of standing crop

The term ‘Ecology’ deals with the study of organisms from all sources and their interaction with surrounding environments. The aim of ecology is, therefore, to understand and also to explain the relationships of all organisms to their environment. In this respect, the duty of the ecologist is to study a particular environment, estimate the population of each species, recognize the communities, and determine their activities and their interactions with both related species, the rest of the community, and their environment. Macroecological studies always initiate by defining the species composition and then proceed to draw certain conclusions on the role of these species in the ecosystem. On the other hand microbial, especially bacterial classical taxonomy (based on isolation techniques and determination of morphology and in vitro biochemical characteristics of isolates) for determination of each species of aquatic bacteria is almost impossible, except in a few cases. Consequently, the microbial ecologist has to depend upon certain methods that can measure the biomass or activity of a very large conglomerate of coexisting microbial taxa in an aquatic environment. Probably, this has caused the very slow development of microbial ecology concepts and application of a general ecological theory to the microbial ecology.

1. Detection means the existence of whatever do you want detecting but diagnosis is that the analysis in depth of existing thing.
2. Objectively look for, listen to the credible complains, symptoms that is sometimes not visible at all.
3. It is art or skill of identifying some abnormalities, i.e. which is below or higher than the normal permissible range/threshold.

A. Evaluation of the efficacy and resistance of anthelmintics against Helminths Anthelmintic resistance According to WAAVP (World Association for the Advancement of Veterinary Parasitology) anthelmintic resistance is a failure to reduce feacal nematode egg count by at least 95%. Technically accurate definition is that resistance is a genetically determine decline in the efficacy of an anthelmintic against a population of parasite that is susceptible to the drug. The history of parasite resistance to anthelmintic starts with the first report on phenothiazine resistance in 1957. Haemonchus contortus was the first nematode to develop resistance against different anthelmintic. The World Association for the Advancement of Veterinary Parasitology has recommended two tests for detecting anthelmintic resistance in ruminants, horses and pigs. These are in vivo test (FECRT) and an in vitro test (the egg hatch test). Detection Technique

Objectives

1. To know the methods of essential oil extraction of spices and condiments.
2. To know the various chemicals present in the essential oil of different spices and condiments.

Essential oil: Essential oils are the liquids that are isolated from plants when introduced to solvents. They are liquefied versions of the plants.

Extraction methods of essential oil

1. Steam Distillation
2. Solvent Extraction
   1. CO₂ Extraction
   2. Maceration
   3. Enfleurage
3. Water Distillation
4. Water and Steam Distillation

Detection and identification of the causes and diagnosis of the diseases rapidly and precisely are the basic requirements for developing effective crop disease management systems suitable for different ecosystems. Incorrect diagnosis leads to failure to contain the disease spread and consequent additional expenditure to the growers. Hence, it is essential that proper diagnostic procedures are followed to achieve the goal of reducing both quantitative and qualitative losses of agricultural and horticultural produce. Morphological, biological, biochemical, physiological, immunological and genomic characteristics of microbial plant pathogens have been carefully considered to develop rapid, sensitive and reliable methods of detection and identification of cause(s) of newly observed disease (s) in the locations concerned. Various methods of establishing the nature of microbial plant pathogens are discussed in detail in earlier publications

2.1  Write True/False

Q.1    From theoretical point of view, the most general method of estimation is the “Maximum Likelihood Estimation Method.”
Q.2    The method of “maximum Likelihood Estimation” was initially formulated by the statistician named as “C.F. Gauss.”

4.1 Introduction

Extraction is a process whereby the desired constituents of a plant are removed using a solvent. The primary ways for extraction of organic molecules of interest to biologists and medical investigators involve breaking open the cells. Cell rupturing is carried out in a variety of ways. The method used depends on the type of tissue used. For plant cells grown in cell suspension culture or for plant callus tissue, a French press or a sonicator can be used to break open the cell. Plant cells grown in culture can also be ruptured with a glass tissue homogenizer. Silicified or highly lignified plant tissues within the organs such as roots, stems, leaves, fruits and seeds are usually frozen and pulverized using liquid nitrogen in a mortar and a pestle (Kaufman et al., 1999). Softer tissues can be ground in a small volume of buffer in a mortar, washed white sand and a pestle to rupture the cells.

When the cells have been ruptured, the extraction is performed using the appropriate techniques. Water soluble compounds and proteins are extracted in buffers or water. Organically soluble compounds are extracted with organic solvents. Boiling ethanol is a good all-purpose solvent for preliminary extraction (Harborne, 1998). The success of the extraction with alcohol is directly related to the extent chlorophyll (when isolating substances from green tissue) is removed into the solvent. The most common chemical procedure for obtaining organic constituents from dried plant tissues is to continuously extract powdered material in a Soxhlet apparatus with a range of solvents, starting with petroleum ether and chloroform (to separate lipids and terpenoids) and then using alcohol and ethyl acetate (for more polar compounds). This method is useful when working on the gram scale. However, one rarely achieves complete separation of constituents and the same compounds may be recovered (in varying proportions) in several fractions. The extract obtained is clarified by filtration and is then concentrated in vacuo in a rotary evaporator. To prevent fungal growth, a trace of toluene may be added to the concentrated extracts and they should be stored in refrigerator. There are short cuts in extraction procedures which one learns with practice. The concentrated extract may deposit crystals on standing.

Extraction is a process whereby the desired constituents of a plant are removed using a solvent. The primary ways for extraction of organic molecules of interest to biologists and medical investigators involve breaking open the cells. Cell rupturing is carried out in a variety of ways. The method used depends on the type of tissue used. For plant cells grown in cell suspension culture or for plant callus tissue, a French press or a sonicator can be used to break open the cell.

Objective

1. To know the different types of fertilizer application methods applied in spices and condiments.

Methods of fertilizer application: The different methods of fertilizer application are as follows:

a) Broadcasting

1. It refers to spreading fertilizers uniformly all over the field.
2. Suitable for crops with dense stand, the plant roots permeate the whole volume of the soil, large doses of fertilizers are applied and insoluble phosphatic fertilizers such as rock phosphate are used.

Broadcasting of fertilizers is of two types

1. Broadcasting at sowing or planting (Basal application): The main objectives of broadcasting the fertilizers at sowing time are to uniformly distribute the fertilizer over the entire field and to mix it with soil.