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Soil 100: Introduction To Soil Science Question Paper

Soil 100: Introduction To Soil Science 

Course:Bachelor Of Science

Institution: Egerton University question papers

Exam Year:2011



ANSWER ALL QUESTIONS

1. Differentiate between the following terms:
a. Soil texture and soil structure (4 Marks)
b. Silicate and non-silicate minerals (2 Marks)
c. Primary and secondary minerals (2 Marks)
d. Gravimetric and volumetric water content (2 Marks)
2. Explain the role of the following processes of soil formation:
a. Weathering (2 Marks)
b. Topography (4 Marks)
c. Climate (4 Marks)
3.(a) Explain the concept of 'soil available water' (6 Marks)
(b) Explain the main soil factors that affect its capacity in moisture retention. (10 Marks)
4.(a) Distinguish between the permanent and variable sources of charges on soil
colloids. (4 Marks)
(b) Sketch and give the main properties of the layer silicate clay colloids. (8 Marks)
(c) Define Cation Exchange Capacity (CEC) and explain how it influences soil
productivity. (6 Marks)
5. Briefly discuss the key principles used in:
a. Water erosion control (6 Marks)
b. Wind erosion control (4 Marks)
6. Define a soil map and explain its usefulness in crop production. (6 Marks)




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