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Soil 100: Introduction To Soil Science. Question Paper

Soil 100: Introduction To Soil Science.

Course:Bachelor Of Science In Agriculture

Institution: Kisii University question papers

Exam Year:2017

1.DO NOT WRITE ANYTHING IN THIS QUESTION PAPER.
2.ANSWER QUESTION ONE AND ANY OTHER TWO QUESTIONS.

QUESTION ONE
a) Define the following words:
i)Soil structure .(1mark)
ii) Mineral.(2mark)
iii)Transitional zone.(1mark)
b) Discuss in details the effect of organic matter on Soil properties.
(10 marks)

c) Discuss how the following biological agents enhance weathering:

i) plants.(3marks)
ii) Microorganisms.(2marks)
d) Discuss the following Soil components

i) Mineral matter.(2marks)
ii) Organic matter.(3marks)
e) Discuss the factors that affect Soil porosity.
(10marks)

QUESTION TWO
a) Discuss briefly how sedimentary rocks are formed.
(6marks)

b) For a 50g soil sample the first reading hydrometer was 20g and the second one was 25g. Calculate the % clay ,silt and Sand.
(6marks)

c) Name THREE methods used in textural determination.
(3marks)

QUESTION THREE
a) List the FOUR purpose of soil classification. (4marks)

b) Differentiate between inorganic and organic colloids.(4marks)

c) Farmers in their daily activities can control soil erosion. Discuss briefly cultural methods that can be used by farmers to control soil erosion.
(7marks)

QUESTION FOUR
a) Discuss the FOUR conditions that influence microbial activity and growth. (8marks)
b) Enumerate the beneficial effects of soil microbes. (6marks)