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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:2011

ANSWER ALL QUESTIONS

1. Define the following terms: (10 Marks)
a. Negative nutrient balance
b. Soil fertility
c. Fertilizer top dress
d. Basal fertilizer application
e. Soil productivity
2.(a) Give a brief discussion of the three methods of nutrient acquisition by plant
roots in the soil. (8 Marks)
(b) Write short notes on the following: (9 Marks)
i. Forms of N taken by plants
ii. Forms of P taken by plants
(c) Name three major pathways that agroecosystems loose nutrients and briefly
discuss one of them. (6 Marks)
3.(a) Define the following terms: (4 Marks)
i. Fixed nutrients
ii. Labile nutrients
(b) Outline the ammonium and nitrate ion uptake by plants. (8 Marks)
(c) Crop yield decline occurs after conversion of a forested land to an arable land.
Explain what happens. (3 Marks)
4.(a) Differentiate between field fertilizer trials and greenhouse for experimentation(4 Marks)
(b) Briefly explain what is meant by the following terms. (6 Marks)
i. Exchange ions
ii. Available ions
iii. Green manure
(c) State three ways in which organic matter influences soil water dynamics. (3 Marks)
5.(a) State two deficiency symptoms of phosphorous in a plant. (2 Marks)
(b) What are essential plant nutrients? (4 Marks)

Soil 320: Soil Fertility And Plant Nutrition Question Paper

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