Indira Gandhi National Open University (IGNOU) 2006 B.Tech Water Resource Engineering ET - 537A Soil Conservation and Agronomy - - Question Paper
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B.Tech. Civil (Water Resources Engineering) Term-End Examination
December, 2006
ET-537(A) : SOIL CONSERVATION AND AGRONOMY
Time : 3 hours Maximum Marks : 70
Note : Attempt any seven questions. All questions carry equal marks. Use of calculator is permitted.
1. List five main types of soil erosion. Compare them (in tabular form) in terms of mechanics of erosion, causative factors and detrimental effects. 10
2. How do you estimate soil loss due to wind erosion ? Discuss the suitability and effectiveness of any four methods of control of wind erosion. 1 0
3. Describe the hydraulic characteristics of different shapes of waterways. Design a trapezoidal shape grass waterway to carry out a flow of 3:024 x 10 nvVday down a slope of
1 in 40. Make all other necessary assumptions. 10
4. What are the factors that control the gully erosion process ? Give detailed procedure for design of a temporary check dam in an arid region. 10
5. Explain the two dimensionless numbers frequently used in connection with channel flow. With a labelled diagram, describe energy dissipation in a hydraulic jump. 10
6. Write down the field situations where farm drainage is required. With the help of neat sketches, describe the important technical features of different types of surface drains. o
7. What are the different amendment methods for reclamation of alkali soil ? Develop a relationship between gypsum requirement and exchangeable sodium. 10
8. What is the economic importance of weed management ?
How do the weed management programmes differ in the cases of the following crops : io
(a) Rice
(b) Maize
(c) Sugarcane
9. What are the various formulations of pesticides ? Compare
their effectiveness. Also, list equipment for application of respective formulations. iq
10. Discuss different methods of rainwater harvesting in an agricultural field. Detail out conservation bench terracing with specific technical details. iq
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