JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PRINCIPLES OF SOIL SCIENCE AND AGRONOMY Previous Question Paper (May - 2019 - R13)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
List out different chemical processes involved in chemical weathering of rocks.
Answer
The primary chemical processes involved in the weathering of rocks are: 1) Hydration, 2) Hydrolysis, 3) Carbonation, 4) Oxidation, 5) Reduction, and 6) Solution.
Write flow chart for determination of soil texture.
Answer
- Soil sample collection and preparation (air-drying and sieving).
- Dispersion of soil particles using a dispersing agent (e.g., sodium hexametaphosphate).
- Separation of particle size fractions (sand, silt, and clay) using sedimentation (pipette or hydrometer method).
- Calculation of percentage of each fraction.
- Determination of textural class using the USDA/International textural triangle.
Discuss Saturated flow Vs Un saturated flow.
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Write about influence of soil temperature on plant growth.
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Explain Arnon’s criteria of essentiality.
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Write about black soils.
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Write about Rice puddling.
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Explain different layers of Atmosphere.
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Define Geological erosion and Accelerated erosion.
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Define and list out objectives of Watershed management.
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Part B
What is chemical weathering of rocks and minerals and explain chemical weathering with examples/ equations?
Answer
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Differentiate between Podzolozation and laterization processes.
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Define rock? Explain different processes involved in formation of rocks and classify the sedimentary rocks?
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Write about Humification, Elluviation.
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Write about field capacity, Hygroscopic coefficient, Permanent wilting point.
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Write about importance of drainage.
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Define Colloid. Explain general properties of soil colloids.
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Write about management of soil temperature.
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Write about nutrient availability in problem soils and their reclamation.
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Write about formation of saline and alkaline soils.
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Explain use of saline water in agriculture.
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Explain influence of organic matter on soil physical, biological and chemical properties of soils.
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Write about agro climatic zones of Andhra Pradesh.
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Write about scope of agronomy in agriculture.
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Write classification of field crops along with examples.
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Define tillage and explain different types of tillage practices.
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Explain principles of weed control.
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Write the differences between dry farming, dry land farming, rain fed farming.
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Write agronomic measures to reduce evapo transpiration losses.
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Define sustainable agriculture. Write principles of sustainable agriculture.
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