Waec Model Questions Vol1 2019 Agricultural Science Question 17
Practice objective / multiple choice question 17 from the 2019 Waec Model Questions Vol1 Agricultural Science examination.
A farmer practices a two‑year rotation of maize and cowpea on a 4‑ha field. In the maize year the crop yields 3.5 t ha⁻¹ and requires 120 kg N ha⁻¹. In the cowpea year the crop yields 1.8 t ha⁻¹ and fixes 45 kg N ha⁻¹, which becomes fully available to the subsequent maize crop. Assuming no synthetic nitrogen is applied to the cowpea year, calculate the average amount of synthetic nitrogen fertilizer the farmer must apply per hectare per year over the two‑year rotation. Express your answer in kg N ha⁻¹ yr⁻¹ (to one decimal place).
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About This Question
This is Waec Model Questions Vol1 2019 Agricultural Science Question 17. It is one of the objective questions from the 2019 Waec Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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