Elements of Soil Science - Past / old Questions - 2068 Baishakh, Bachelor in Agricultural Engineering, Tribhuvan University, Nepal, Third semester,
TRIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
Examination Control Division
2068 Baishakh
Exam: Regular / Back
Level: BE
Programme: B.Agri.
Year / Part: II / I
Time: 3 hrs.
Full Marks: 80
Pass Marks: 32
Subject: Elements of Soil Science
✓ 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.
1.
a) What are the Pedological and Edaphological concepts for defining the soil? Write the process of soil survey and mapping.
[4+4]
b) What are factors affecting soil formation? Describe about surface diagnostic horizon.
[4+4]
2.
a) Classify the soil according to soil reaction (pH value). Describe about major soil forming process.
[4+4]
b) Describe seasonal soil temperature variation as function of depth with diagram. What are the characteristics of soil aeration?
[4+4]
3.
a) Differentiate between soil texture and soil structure. Describe the method of formation of stable aggregation.
[4+4]
b) What are methods of managing soil temperature? How does soil become acidic or basic? Explain.
[4+4]
4.
a) What are the types of soil colloids? Discuss about anion exchange capacity and its importance.
[4+4]
b) Define nitrification, denitrification, and nitrogen fixation. What are the functions of boron, zinc, and nitrogen?
[4+4]
5.
a) What are the functions of organic matters? Write the steps of procedure for laboratory analysis of soil.
[4+4]
b) What are the functions of primary plant nutrients?
[6+2]
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