Soil Fertility And Evaluation Question Paper

Soil Fertility And Evaluation

Course:Master Of Science In Agricultural Extension

Institution: Kenyatta University question papers

Exam Year:2010

INSTITUTIONAL BASED PROGRAMME (IBP) – AUGUST SESSION
EXAMINATION FOR THE DEGREE OF MASTER OF SCIENCE IN
INTEGRATED SOIL FERTILITY MANAGEMENT (ISFM)
KRM 502:
SOIL FERTILITY AND EVALUATION

DATE: Wednesday, 29th December, 2010
TIME: 9.00 a.m. – 12.00 p.m.
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INSTRUCTIONS:
Answer question ONE and any other THREE questions.
1.
a)
Differentiate between

i)
Nitrogen fixation and phosphorus fixation
(3 marks)

ii)
Essential and beneficial elements

(2 marks)

iii)
Deficient and Insufficient nutrient status

(2 marks)

b)
Describe the fate of applied P-fertilizer in both acidic and calcareous soils

(4 marks)

c)
Explain five (5) environmental factors affecting plant growth

(5 marks)

d)
State the soil and environmental conditions under which sulfur

deficiencies are most likely to occur in the field

(5 marks)

e)
Explain the concept of ISFM and its importance in smallholder agriculture

(5 marks)

f)
What practices would you take to maximize N2 assimilation by rhizobium

bacteria in soil?

(4 marks)

2.
Discuss the factors affecting nitrification of NH +
4 -N in soils.
(10 marks)
Page 1 of 2

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3.
Using chemical equations, explain the role of liming materials (CaC03 / Ca0)
added to the soil in ameliorating agricultural land

(10 marks)

4.
Briefly discuss appropriate soil fertility replenishment strategies available for
smallholder farmers in Central Kenya.

(10 marks)

5.
a)
Why is soil testing important?

(3 marks)

b)
What are the disadvantages of bulk blending of fertilizers (2 marks)

c)
Discuss the factors you would consider in deciding the rate of fertilizer

application for a maize crop

(5 marks)

Page 2 of 2

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