Gce Model Questions Vol1 2021 Agricultural Science Question 39
Practice objective / multiple choice question 39 from the 2021 Gce Model Questions Vol1 Agricultural Science examination.
A wheat farmer monitors a 5‑ha field for the grain aphid \(Sitobion\ avenae\). The economic injury level (EIL) is 150 aphids per tiller. Each tiller carries on average 30 tillers per m². The market price of wheat is \(\text{₦}45\) per kg and each aphid above the EIL reduces yield by 0.02 kg per ha. The cost of one insecticide spray is \(\text{₦}12{,}000\) and each spray reduces the aphid population by 70 %. The current aphid density is 200 aphids per tiller. Determine the minimum number of sprays required to keep the density at or below the EIL, and calculate the net monetary outcome (profit or loss) after accounting for spray costs, assuming that without spraying the yield loss follows the aphid damage rule.
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About This Question
This is Gce Model Questions Vol1 2021 Agricultural Science Question 39. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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