Elements of Soil Science - Past / old Questions - 2068 Ashadh, Bachelor in Agricultural Engineering, Tribhuvan University, Nepal, Third semester
![RIBHUVAN UNIVERSITY INSTITUTE OF ENGINEERING Examination Control Division 2067 Ashadh 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 any Five questions. ✓ The figures in the margin indicate Full Marks. ✓ Assume suitable data if necessary. 1. a) How are the edaphological views different from pedological views in the study of soils? Explain the process of soil formation. [2+6] b) How is soil classified according to soil taxonomy? Write down the process of soil survey and mapping. [2+6] 2. a) Explain the process of aggregation in the soils. What is the process of determination of soil colour? [4+4] 3. a) Define bulk density, particle density, and porosity of soil. Describe the weathering process of minerals and rock. [4+4] 4. a) What are the effects of soil aeration in soil? Describe about seasonal soil temperature variation with the depth of soil. [4+4] b) What are the factors affecting plant-available soil moisture? Describe about soil moisture characteristic curve. [4+4] 5. a) What are the function and deficiency symptoms of primary plant nutrients? Define flocculation and dispersion of soil. [4+4] b) Explain the process of formation of acidic soils. Write some nitrogenous, phosphoric, and potassic fertilizer. [4+4] 6. a) Describe the physical properties of colloids. How do the soil colloids influence the availability of nutrients for plant use? [5] b) What are functions of soil organic matter? Write down the advantages and disadvantages of green manuring. [5] 7. Write short notes on (any four): [4 x 5 = 20] a) Nitrification and nitrogen fixation b) Soil profile c) Soil texture and soil structure d) Soil moisture tension e) Cation exchange capacity of colloids](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj6wvM7X-1KukD_XNM6osTDW4WqLICXvOKc9wLeEXeCav1N1WURHY6v0Ec7Mpb5wmdTq0aW6XLwNeNzoAqLg_yTJFvtcJt6DGtfHDoJSt-TiHiOCvaWNcvKJHqophftVvan5SjD0xDtB5AdF35NZGIy2RuH1goalZi-u_Rl1LCyHLNC1wmYlcgtVPxAN7pS/s2089/3_soil_science_2067_ashadh.jpg "Elements of Soil Science - Past Questions - 2067 Ashadh")
RIBHUVAN UNIVERSITY
INSTITUTE OF ENGINEERING
Examination Control Division
2067 Ashadh
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 any Five questions.
✓ The figures in the margin indicate Full Marks.
✓ Assume suitable data if necessary.
1.
a) How are the edaphological views different from pedological views in the study of soils? Explain the process of soil formation. [2+6]
b) How is soil classified according to soil taxonomy? Write down the process of soil survey and mapping. [2+6]
2.
a) Explain the process of aggregation in the soils. What is the process of determination of soil colour? [4+4]
3.
a) Define bulk density, particle density, and porosity of soil. Describe the weathering process of minerals and rock. [4+4]
4.
a) What are the effects of soil aeration in soil? Describe about seasonal soil temperature variation with the depth of soil. [4+4]
b) What are the factors affecting plant-available soil moisture? Describe about soil moisture characteristic curve. [4+4]
5.
a) What are the function and deficiency symptoms of primary plant nutrients? Define flocculation and dispersion of soil. [4+4]
b) Explain the process of formation of acidic soils. Write some nitrogenous, phosphoric, and potassic fertilizer. [4+4]
6.
a) Describe the physical properties of colloids. How do the soil colloids influence the availability of nutrients for plant use? [5]
b) What are functions of soil organic matter? Write down the advantages and disadvantages of green manuring. [5]
7. Write short notes on (any four): [4 x 5 = 20]
a) Nitrification and nitrogen fixation
b) Soil profile
c) Soil texture and soil structure
d) Soil moisture tension
e) Cation exchange capacity of colloids
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