Elements of Soil Science - Past / old Questions - 2070 Chaitra, Bachelor in Agricultural Engineering, Tribhuvan University, Nepal, Third semester,
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| Elements of Soil Science - Past Questions - 2070 Chaitra |
TRIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
Examination Control Division
2070 Chaitra
Exam: Regular
Level: B.E.
Programme: B. Agri.
Year / Part: II / I
Subject: Elements of Soil Science (AE502)
Full Marks: 80
Pass Marks: 32
Time: 3 hrs.
✓ Candidates are required to give their answers in their own words as far as practicable.
✓ Attempt All questions.
✓ The figures in the margin indicate Full Marks.
✓ Assume suitable data if necessary.
How does soil differ from land? Describe the Edaphological concept of soil science.
[2 + 2]What are the types of minerals found in soil? Explain briefly the weathering processes of rocks and minerals.
[2 + 4]What do you mean by soil morphology? Describe the soil formation factors.
[2 + 6]Why is the classification of soil necessary? Write briefly the features of soil temperature regimes.
[2 + 4]What are the soil attributes and environmental conditions of brown to black color in soil? Which texture of soil do farmers prefer and why?
[2 + 4 + 3]Describe the feel method of determining soil texture. Explain briefly the types of soil structure.
[7]Why is it necessary to determine the bulk density of soil for an agriculturist? A soil sample was taken with the help of a core cutter with an internal diameter of 10 cm and a height of 13 cm. The initial weight of soil was 1.5 kg and the oven-dry weight was found to be 1.3 kg. Determine the bulk density of the soil.
[2.5 + 1.5]Write down the significance of soil temperature in relation to agriculture. What are the effects of poor soil aeration?
[2 + 4]How will you control excess temperature in soil? Write down the reasons for poor aeration.
[2 + 2]Define soil moisture, infiltration, and percolation. Write down the importance of the soil moisture curve in agricultural engineering.
[2 + 4]What are macronutrients? What are the roles of nitrogen in plants? Write down the symptoms of nitrogen deficiency.
[2 + 2]Define soil pH. How can you determine soil pH in the laboratory? What type of treatment can be applied to acidic soil?
[1 + 3]What do you mean by soil organic matter? Why is it necessary for plants? How do you determine soil organic matter in the laboratory?
[1 + 2 + 3]What do you mean by complete and incomplete fertilizer? Explain with examples. What are the advantages and disadvantages of inorganic fertilizers?
[2 + 2]What is a soil colloid? What are the roles of soil colloids? What are the sources of charges on soil colloids?
[1 + 2]
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