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Soil 320: Soil Fertility And Plant Nutrition Question Paper

Soil 320: Soil Fertility And Plant Nutrition 

Course:Bachelor Of Science

Institution: Egerton University question papers

Exam Year:2012



ATTEMPT ALL QUESTIONS

1.(a) What determines whether a given plant nutrient element is essential or not? (3 Marks)
(b) Describe the interaction between elements in plant metabolism. (5 Marks)
(c) Describe one role for each of six essential plant micronutrients. (12 Marks)
2.(a) What is fertilizer use efficiency? (4 Marks)
(b) Explain why the efficiency of P fertilizers in soils is usually low. (4 Marks)
(c) What are the practical ways of improving agronomic effectiveness of P fertilizer (4 Marks)
3.(a) Name the process in the N-cycle that are controlled by microorganisms. (8 Marks)
(b) Describe the different mechanisms by which nutrients move through the soil to the
plant roots. (12 Marks)
4.(a) Define the terms: fertilizer grade, fertilizer ratio, and filler materials. (6 Marks)
(b) Given three straight fertilizers, ammonium sulphate (20%), simple superphosphate
(18%) and potassium chloride (60%). Form 1000kg of 8-8-8 compound fertilizer. (12 Marks)




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