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SOIL, PLANT AND WATER ANALYSIS OF HORTICULTURE CROPS

Chittaranjan Sarangi
  • Country of Origin:

  • Imprint:

    NIPA

  • eISBN:

    9789390512638

  • Binding:

    EBook

  • Number Of Pages:

    126

  • Language:

    English

Individual Price: 6,475.00 INR 5,827.50 INR + Tax

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Agricultural, horticultural, forestry and fodder production etc. for the burgeoning population are ever increasing enterprises that impose heavy tasks on the management of natural resources. Short term profitability at the cost of sustainability disharmonises the natural forces and processes resulting in peril of the inhabitants of the earth. To this end an understanding with conviction of the principles of soil, plant and water analysis as applied to horticulture will enhance the realization of management goals in harmony with nature. Intended primarily to be a text book, it will help educate learners to follow those principles. Students, planners, faculties and anyone interested in achieving those goals will find it necessarily useful.

0 Start Pages

Preface Agricultural, horticultural, forestry and fodder production etc. for the burgeoning population are ever increasing enterprises that impose heavy tasks on the management of natural resources. Short term profitability at the cost of sustainability disharmonises the natural forces and processes resulting in peril of the inhabitants of the earth. To this end an understanding with conviction of the principles of soil, plant and water analysis as applied to horticulture will enhance the realisation of management goals in harmony with nature. Intended primarily to be a text book, it will help educate learners to follow those principles. Students, planners, faculties and any one interested in achieving those goals will find it necessarily useful.

 
1 Introduction

Horticultural plants present a kaleidoscopic scenario from small herbs to very big deep rooted perennial trees. The associated rhizospheres present variable conditions as to supply of nutrients, water and air. The principles governing their physical, chemical and biological properties along with their relationship with plants need to be understood clearly. The plants differ in their requirements at various stages of growth; hence their tissues require constant monitoring of nutrient status for better productivity and quality. As nutrient behavior in soils is governed by soil properties and environmental conditions, measurement of such properties is often required. These include pH, salinity, organic matter, CaCO3 and texture in drier areas the presence of Na and gypsum (CaSO42H2O) is also of concern.The irrigation water is a source of dissolved salts which are also nutrients and in excess impede water and nutrient relations of soil and plant. It requires a thorough understanding of the principles underlying methods of collection, characterization of water, air and nutrient relations of soil-plant system, monitoring of plant nutrient status, quality of irrigation water and soil and water pollution for effective management of nutrients avoiding pollution. Soil and plant analysis is a diagnostic instrument for soil fertility and basis for fertilizer recommendation; to know where and where not fertilizer is to be applied. Obtaining accurate and precise values has always being the basis of soil analysis.

1 - 2 (2 Pages)
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2 Soil Sampling - Importance, Methods of Sampling and Processing of Soil Samples

Introduction The objective of soil sampling is to obtain reliable information about a particular soil. The value of laboratory data in soil studies largely depends on effective sampling. Soil sampling is one of the most important aspects in the determination of the properties of the soil. Care in preparation and analysis can overcome the damages of careless or inappropriate sampling in the field (Bates, 1993). Errors arising from sampling are mainly related to spatial variability of the soil. While keeping in mind financial constraints, sampling procedures should be adopted properly to minimize the influence of spatial variability and to maximize the accuracy of mean plot values for the measured soil variables. The obtained soil data should be representative for the whole observation plot, taking into consideration the spatial variability of the soil within the plot. Importance of soil sampling Soil sampling and testing are done to provide an estimate of the capacity of the soil to supply adequate amount of nutrients to meet the needs of growing crops and information to its nature and problem. Traditionally, the goal of soil sampling is to develop a representative estimate of a field. A few grams of soil are actually used for the laboratory analysis. That small amount must represent the entire area for which the recommendation is to be made. The samples should be collected in such a way that it would represent the area for which recommendation is to be made.

3 - 8 (6 Pages)
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3 Plant Sampling; Importance, Methods of Sampling and Processing of Plant Samples

Introduction Plant analysis can be defined as the quantitative determination of the concentration of an element or extractable fraction of an element in a sample from a particular part or portion of a crop. From the nutritional standpoint, plant analysis is based on the principle that the concentration of a nutrient within the plant is an integral value of all the factors that have interacted to it. Plant analysis is used as an index of available nutrient element supply. Plant growth or yield are compared with the elemental concentrations contained in the dry matter of the entire plant or plant structures such as leaves, petioles, fruit or grain sampled at different times during their development. Plant analysis gives the overall picture of the nutrient levels within the plant at the time the nutrient was taken. The use of plant analysis is based on the principle that the nutrient level present is as a result of all factors affecting the growth of the plant. Plant analysis involves the determination of nutrient concentration in diagnostic plant part(s) sampled at recommended growth stage(s) of the crop. In a way plant analysis complements soil analysis. There are reliable sampling criteria and procedures for most of the world’s commercial crops. Importance Plant analysis assesses nutrient uptake while soil testing predicts nutrient availability. The two tests are complementary to each other as crop management tools. Plant analysis will detect unseen hidden hunger and confirm visual deficiency symptoms. Toxic levels may also be detected. If it is done early, plant analysis will allow a corrective fertilizer application in the same season.

9 - 16 (8 Pages)
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4 Hydraulic Conductivity, Darcy’s Law and eTermination of Hydraulic Conductivity

Three types of water movement within the soil are recognized. They are Saturated flow Unsaturated flow Water vapour movement Saturated flow This occurs when the soil pores are completely filled with water. This water moves at water potentials larger than 33 kPa. Saturated flow is water flow caused by gravity’s pull. It begins with infiltration, which is water movement into soil when rain or irrigation water is on the soil surface. When the soil profile is wetted, the movement of more water flowing through the wetted soil is termed percolation. Hydraulic conductivity can be expressed mathematically as

17 - 22 (6 Pages)
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5 Renewal of Gases in Soil and Their Abundance

Soil air, its composition, gaseous exchange Soil air is a continuation of the atmospheric air. It is in constant motion from the soil pores into the atmosphere and from the atmosphere into the pore space. The circulation of air in the soil and renewal of component gases like oxygen and carbon dioxide is known as soil aeration. Soil aeration is essential for the respiration and survival of soil organisms and plant roots. Composition of soil air Soil air contains gases like nitrogen, oxygen, carbon dioxide, water vapour and others. The composition of soil air is different from atmospheric air. Soil air contains more carbon dioxide and less oxygen than atmospheric air. It also contains more water vapour than atmospheric air. The nitrogen content of soil air is almost equal to atmospheric air. (Table below)

23 - 30 (8 Pages)
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6 Measurement of Oxygen Diffusion Rate (ODR) and Redox Potential

Measurement of soil aeration Oxygen Diffusion Rate (ODR) - the rate at which O2 in soil air is replenished. ODR decreases with soil depth. Measurement of ODR in soil Lemon and Erickson (1952) devised a method for measuring oxygen diffusion in the soil system with the help of platinum micro electrode Principle When a certain potential is applied across the platinum electrode and a reference electrode inserted in the soil, oxygen is reduced at the platinum surface. The electric current flowing between two electrodes is proportional to the rate of oxygen reduction. The later, in turn, is related to the rate of oxygen diffusion to the electrode. The oxygen diffusion rate (ODR) is calculated from the measured electric current with the following equation.

31 - 36 (6 Pages)
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7 Use of Radio Tracer Techniques in Soil Fertility Evaluation & Radio Tracer Technology Application in Plant Nutrient Studies

In nature there are nearly 300 nuclei, consisting of different elements and their isotopes. Isotopes are nuclei having the same number of protons but different number of neutrons. These techniques are now being used in almost all the areas of plant physiology, soil chemistry and plant biochemistry. In agriculture, radioisotopes are used in the nutritional studies of major and minor elements, plant metabolism, mechanism of photosynthesis studies, and uptake of nutrients and ions mobility in soil. In applying this technique, a minute quantity of radioisotope element is usually mixed with ordinary element of the same kind, the whole batch is termed “tagged” and their role in chemical reactions is traced. The radio labeled fertilizer has been used to study the uptake, retention and utilization of fertilizers. Radioisotopes are used for determining the function of fertilizer in different plants. The tracer technique is used to study the rate and direction of movement of an element in a plant. For this a radioisotope of that element is injected in the ground near the plant. After a few days the plant is laid on a photographic paper to produce an autoradiograph. The dark areas in the radiograph show the positions reached by the element. This technique gives valuable information regarding the optimum season for fertilizing crops and for poisoning weeds. Use of N15 in organic fertilizer studies has significantly advanced the understanding of N release from organic materials. Crop residue or green manure studies are relatively simple. These techniques have been extremely useful in determining how residue quality parameters affect mineralization values. Because of the attention focused on nutrient cycling and management studies in recent years, a number of new P isotope techniques have been developed.

37 - 44 (8 Pages)
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8 Soil Microorganisms and Their Importance

Microorganisms being minute and microscopic are ubiquitous. Besides supporting the growth of various biological systems, soil and soil microbes serve as a best medium for plant growth. Soil fauna & flora convert complex organic nutrients into simpler inorganic forms which are readily absorbed by plants. Soil microbes as nitogen fixers-Symbiotic (Associative): The organisms involved are Rhizobium, Bradyrhizobium in legumes(aerobic): Azospirillum, Azotobacter (grasses), Actinonycetes- Frantkia (with Casuarinas, Alder). Soil microbes as biocontrol agents: Several ecofriendly bioformulations of microbial origin are used in agriculture for the effective management of plant diseases, insect pests, weeds etc. eg: Trichoderma sp and Gleocladium sp are used for biological control of seed and soil borne diseases. Fungal genera Entomophthora, Beauveria, Metarrhizium and protozoa- Maltesia grandis. Malameba locustiae etc.- are used in the management of insect pests. Nuclear polyhydrosis virus (NPV) is used for the control of Heliothis/American boll worm. Bacteria like Bacillus thuringiensis, Pseudomonas are used in cotton against Angular leaf spot and bollworms. Degradation of pesticides in soil: Soil receives different toxic chemicals in various forms and causes adverse effects on beneficial soil micro flora / micro fauna, plants, animals and human beings. Various microbes present in soil act as the scavengers of these harmful chemicals in soil. The pesticides/chemicals reaching the soil are acted upon by several physical, chemical and biological forces exerted by microbes in the soil and they are degraded into non-toxic substances and thereby minimize the damage caused by the pesticides to the ecosystem. For example, bacterial genera like Pseudomonas, Clostridium, Bacillus, Thiobacillus, Achromobacter etc. and fungal genera like Trichoderma, Penicillium, Aspergillus, Rhizopus, and Fusarium play important role in the degradation of the toxic chemicals / pesticides in soil. Biodegradation of hydrocarbons: Natural hydrocarbons in soil like waxes, paraffins, oils etc are degraded by fungi, bacteria and actinomycetes. E.g. ethane (C2 H6) is metabolized and degraded by Mycobacteria, Nocardia, Streptomyces Pseudomonas, Flavobacterium and several fungi.

45 - 50 (6 Pages)
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9 Saline, Alkali, Acid, Waterlogged and Sandy Soils: Their Appraisal and Management

There are four major tracts where salt affected soils are commonly met within India. These are: The Semi-arid Indo-Gangetic alluvial tracts (mainly in Punjab, Haryana, Uttar Pradesh and a part of Bihar) The arid tracts of Rajasthan and Gujarat. The arid and semi arid tracts of southern states, particularly of the irrigated rigor (Vertisols) soils. The coastal alluvium Earlier it was estimated that about 7 million hectares of land have been affected by salinity/sodicity conditions in India. The area under these soils increased and reached to the level 10 million hectares at present.

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10 Chemical and Mineralogical Composition of Important Horticultural Crops

Chemistry of vegetable crops Vegetables play an important role in human nutrition supplying some of the materials, which other food materials are lacking. Vegetables are important in neutralizing the acidity formed during digestion. They also serve as roughages in human nutrition and thus helping digestion. They are the important sources of minerals like Ca, P and Fe. They also form an important source of vitamins, especially vitamin A. Green and yellow vegetables like carrot, turnip, spinach, beans, etc. contain appreciable amounts of vitamin A. Direct seed of beans, peas, and legumes contain appreciable amounts of proteins. Vegetables also contain sufficient amounts of vitamin C and also appreciable quantities of thiamine, niacin and folic acid. Tomatoes and potatoes contain fairly high amounts of vitamin C.

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11 Leaf Analysis, Standards and Index Tissues of Different Crops and Interpretation of Leaf Analytical Values

Leaf analysis and its importance Improved fertilizer management for crops is important in view of today’s need to reduce production costs, conserve natural resources, and minimize possible negative environmental impacts. These goals can be achieved through optimum management of the fertilizer applied. Understanding the crop nutrient requirements and using soil testing to predict fertilizer needs are keys to fertilizer management efficiency. Plant tissue testing is another tool for use in achieving a high degree of precision in fertilizer management. Timely tissue testing can help diagnose suspected nutrient problems or can simply assist in learning more about fertilizer management efficiency. Leaf analysis (also called stem leaf analysis, tissue analysis or foliar analysis) is the most precise method of monitoring plant nutrient levels. While soil analysis reveals the levels of essential soil nutrients, leaf analysis shows the grower exactly what the plant has successfully absorbed. Leaf analysis is especially helpful in detecting nutrient deficiencies before they affect plant health and yield.

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12 Rapid Tissue Tests for Soil and Plant

The crop growth and productivity is conditioned by many factors of which, the nutrient status (Content) of plant parts such as leaf, stem, etc play a critical role. Moreover the leaf and stem are considered as the indicator parts of plants for assessing the nutrients content of plant. Each crop plant requires the essential element at a specific concentration at different growth stages and it is known as ‘critical level’. When the nutrient content of plant depletes below the critical level the plants may exhibit some symptoms. The requirement or otherwise the availability of nutrients can be assessed by i) plant diagnosis ii) soil analysis and iii) plant analysis by two methods a) by qualitative test and b) by quantitative estimation. Based on the plant or soil tests, the required nutrients can be applied for crops to sustain the growth and rectify the deficiency disorders. The rapid tissue test would pave way for rectifying the nutritional problems for quick recovery, however the quantitative estimation of both plant and soil for nutrients concentration will be more useful and economic for applying fertilizers either as basal or foliar and would be the long term strategy to cope up with nutritional problems. For rapid tissue test to assess the nutrient status, different parts of plant should be taken as indicator tissue and some of the representative crops are furnished below:

77 - 82 (6 Pages)
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13 Quality of Irrigation Water

Introduction It is necessary to ascertain the quality of irrigation water so as to gauge the possible effects of this water on the soil. The irrigation water often results in water logging, salinity and alkalinity problems. It is therefore very important to know its quality. Following are the basic criteria or characteristics on which irrigation water quality is judged. Presence of total soluble salts in irrigation water. Proportion of carbonates and bicarbonates in relation to calcium and magnesium in irrigation water. Proportion of sodium in relation to other cations in irrigation water. Concentration of specific ions in irrigation water. Several parameters are employed to judge the quality of irrigation waters No parameter in complete in judging the quality of irrigation water. Further the quality of water should be judged by considering the crop and soil factors. Any judgment without considering the above factors may not be useful. Researchers devised many parameters by following above said criteria. Some of the commonly adopted parameters used to judge the quality of irrigation water are:

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14 Management of Poor Quality Irrigation Water in Crop Management

Introduction In classification of irrigation water, it is assumed that the water will be used for average conditions with respect to soil texture, infiltration rate, drainage, quantity of water used, climate and salt tolerance of the crop. Large deviations from the average for one or more of these variables may make it unsafe to use what, under average conditions, would be a good water; or may make it safe to use what, under average conditions, would be a water of doubtful quality. The relationship to average conditions must be kept in mind in connection with the use of any general method for the classification of irrigation water. However, the quality of irrigation water is evaluated, mainly by the quantity of dissolved salts, proportion of anions, monovalent and divalent cations, sodium adsorption ratio, residual sodium carbonate, potential salinity, specific ion toxicity, proportion of magnesium, calcium in water etc.

87 - 92 (6 Pages)
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15 Soil and Water Pollution

Soil pollution is any physical or chemical change in soil that adversely affects the health of plants and other organisms living in and on it. Soil pollution is important not only in its own right but because so many soil pollutants tend to move into surface water, groundwater, or air. The chief soil pollutants are salts, petroleum products, heavy metals, and agricultural chemicals. Point source releases of industrial solvents (both LNAPLs and DNAPLs) and feedstock chemicals (e.g., for making plastics) often occur as the result of LUSTs (leaking underground storage tanks). Salinization, a common problem in irrigated arid and semiarid regions, makes soil unfit for growing most crops. It is extremely difficult to remove excess salts from salinized soils. A variety of techniques are used for soil remediation, which is cleaning up contaminated soil. These include physical techniques such as Soil vapor extraction (SVE), moving air through the soil. Thermal conduction heating, heating the soil before SVE. Bioremediation methods include Landfarming, fertilizing, liming, and repeatedly plowing contaminated soil to stimulate bacterial decomposition of high molecular weight hydrocarbons like those in diesel oil. Bioventing, pumping air at low rates through soil to provided O2. Biosparging, pumping air into aquifers to provided O2. Phytoremediation, particularly useful for removing heavy metals.

93 - 99 (7 Pages)
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