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Soil 212: Soil Biology Question Paper

Soil 212: Soil Biology

Course:Bachelor Of Science In Agriculture

Institution: Egerton University question papers

Exam Year:2012

ATTEMPT ALL QUESTIONS

1. Name three major categories of soil micro organisms involved in organic residue decomposition.
2. List the typical population range of the following micro organisms per gram of soil:
a. Bacteria
b. Fungi
c. Protozoa
3. Define the following processes:
a. Nitrification
b. Denitrification
c. Immobilization
d. Biological nitrogen fixation
e. Mineralization
f. Amonification
4. List three basic forms of commercial rhizobial inoculants.
5. List the typical amount of nitrogen fixed by common beans, cow peas, pigeon peas, garden peas
and soybeans.
6.(a) Briefly describe two beneficial and two harmful interactions among soil organisms.
(b) Define bioremediation and describe the role of soil microbes in bioremediation.
7.(a) Describe decomposition processes of organic materials added to soil.
(b) Describe how the rate of decomposition of organic materials varies based on its composition.
(c) Briefly describe management options that a farmer can employ to enhance soil biodiversity
for improved crop production.
8.(a) Give a brief description of a method you would use to enumerate soil nematodes.
(b) What can a farmer do to control nematodes in his/her farm?

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