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Agro 102:Principles Of Crop Production First Semester 2011/2012 Question Paper
Agro 102:Principles Of Crop Production First Semester 2011/2012
Course:Bachelor Of Science In Agriculture
Institution: Egerton University question papers
Exam Year:2012
EGERTON UNIVERSITY
UNIVERSITY EXAMINATIONS
NJORO CAMPUS
FIRST SEMESTER 2011/2012
FIRST YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN AGRICULTURE; AGRICULTURAL BUSINESS MANAGEMENT;
AGRICULTURAL ECONOMICS; ANIMAL HEALTH MANAGEMENT; FOOD
SCIENCE AND TECHNOLOGY; INTEGRATED FOREST MANAGEMENT,
AGRO 102 – PRINCIPLES OF CROP PRODUCTION
INSTRUCTIONS: Answer ALL questions
Q1. (a) The hunter-gatherer communities that existed before the beginning of
agriculture in about 10000 BC have been stereotyped by the modern man as
having been primitive, unskilled, and ignorant. Do you agree with this
stereotype? Justify your answer. (7 marks)
(b) Discuss briefly the evolution of modern agriculture. (7 marks)
Q 2. Discuss the models that have been used in agriculture to explain the management
of photosynthesis. (10 marks)
Q 3. (a) State the Hopkins Bioclimatic Law. (2 marks)
(b) A farmer in Kisimayu, Somalia (440
E) is participating in an on farm research
project. He planted his pearl millet on 15th
February 2012. What date would
you expect another participant farmer in Hyderabad, India (800 E) to plant his
experiment. (4 marks)
Q4. In a study to investigate the effects of early sowing on the yield of maize, a
researcher planted seeds at a spacing of 75cmx30cm in a one hectare field. The
seed lot had a mean seed weight of 0.35 grams and 80% germination.
(a) Calculate :
(i) The plant population per hectare (2 marks)
(ii) The actual seed rate (2 marks)
(b) At harvest, each plant had 2 cobs. 80% of the plants reached maturity. Each cob had
14 lines of grains and 28 grains per line. The mean seed weight was 0.35 grams.
Calculate the yield in 90 kg bags per hectare.
(5 marks) (c) The researcher applied 200 kgs N and 60 kgs P2O5. The nitrogen fertilizer was
applied in two splits, urea was used as a top dress. Phosphorous was applied once at
planting. Calculate:
(i) Quantity of nitrogen applied at planting. (2 marks)
(ii) Quantity of DAP (18-46-0) used at planting. (2 marks)
(iii) Quantity of urea (46-0-0) applied at top dressing.
(2 marks)
Q5. (a) Discuss the management practices that can be used to reduce the impact of
weeds without resorting to the use of herbicides. (8 marks)
(b) You sprayed your wheat research plots with a pesticide two times at an
interval of seven days. This did not control the target pest. Why do you
think your control effort might have failed? (5 marks)
(c) State why it is important to use a diversity of fungicides with different
modes of action to control fungal diseases. (2 marks)
(d) Give a schematic illustration of the build up of fungicide resistance in
pathogens. (8 marks)
Q6. With respect to planning for post harvest quality of agricultural produce,
outline and give examples of risks and hazards that need to be minimized as
part of quality assurance measures. (7 marks)
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