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University Examinations Question Paper

University Examinations

Course:Bachelor Of Agricultural Education And Extension

Institution: Kisii University question papers

Exam Year:2012

EGERTON UNIVERSITY
UNIVERSITY EXAMINATIONS
KISII UNIVERSITY COLLEGE
TOWN CAMPUS
FIRST SEMESTER 2012/2013
MAY- AUGUST, 2012

SOIL 320: SOIL FERTILITY AND CROP NUTRITION
STREAM: AGR Y2 S1 2HRS
DAY: FRIDAY 2:00PM - 4:00PM DATE:10/8/12
INSTRUCTIONS
1 Do not write anything on this question paper
2 Answer all questions in section A and any other Two in section B

section A (40 marks

1 (a) Give a brief description of the following terms
(i) Macro nutrients
(ii) Micro nutrient
(iii)Sodic
(iv) Saline-sodic soil
(b)which soil textures will probably have deficiencies in plant nutrients and why (4 mks)
2 (a) what is 'soil buffer capacity' (2 mks)
(b) Outline three requirements necessary for a material to qualify to be a good lime (3 mks)
(c) In the laboratory determination of lime requirement, a 10g soil sample was found to require 0.4 Cmol/kg of the base to raise its pH from 5.5 to 6.5. Calculate its lime requirement in tons/ha of CaCO3
Note: 1 ha furrow slice= 2.0* 106 kg; Ca=40; C= 12 and O=6 (3 mks)
3 (a) Outline two functions and two deficiency symptoms of each of the following elements
i N
ii P (6 mks)
(b) State the plant available forms of the above elements. (2 mks)
4 (a) How does the pH of the soil solution affect the availability of the following essential elements
i. P ii. Fe and Mn ( 2mks)
(b) Al3+ is considered as one of the acidic cation, explain why this is the case and give the reaction equations to support your answer (6 mks)
5 (a) Give two examples in each of the following fertilizer groups
i. Phosphate fertilizers
ii.Mixed fertilizers (2 mks)
(b) Describe the factors that determine the kind and amount of fertilizers to apply (6 mks)

Section B (30 marks)

6 Discuss environment factors that influence plant growth (15 mks)
7 (a) Explain three ways in which fertilizer is placed in the soil (6 mks)
(b) Discuss the role of organic matter in soil fertility management (9 mks)
8 Discuss ways in which nutrients move from the bulk soil into the crop (15 mks)

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