Neco Model Questions Vol1 2021 Agricultural Science Question 5

Practice essay / theory question 5 from the 2021 Neco Model Questions Vol1 Agricultural Science examination. This question covers soil fertility, crop rotation, legume nitrogen fixation, yield improvement .

Neco Model Questions Vol1 2021 Agricultural Science Essay / Theory
Topics: soil fertility crop rotation legume nitrogen fixation yield improvement
Question 5 NECO_MODEL_QUESTIONS_VOL1 • 2021 • AGRICULTURAL_SCIENCE • essay

A farmer in the savanna zone intends to improve the productivity of a 5‑hectare field that has been continuously cultivated with maize for the past five years.

Question Parts

( a )
Explain how the inclusion of a leguminous crop in a rotation can enhance soil fertility and increase the yield of the subsequent maize crop.
( b )
If the farmer introduces a three‑year rotation of maize – cowpea – maize, and research shows that cowpea fixes 50 kg N ha⁻¹, while each additional kilogram of available nitrogen increases maize grain yield by 10 kg ha⁻¹, estimate the expected increase in maize yield (kg ha⁻¹) in the third year compared with continuous maize, assuming all fixed nitrogen becomes available to the following maize crop.
( c )
Design a detailed three‑year crop rotation plan for the 5‑ha field. Indicate the crop to be grown each year, the proportion of the area allocated to each crop, and justify how the plan meets soil‑fertility, pest‑disease management and market‑demand considerations.

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About This Question

This is Neco Model Questions Vol1 2021 Agricultural Science Question 5. It is one of the essay questions from the 2021 Neco Model Questions Vol1 Agricultural Science examination.

The question covers soil fertility, crop rotation, legume nitrogen fixation, yield improvement .

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