Gce Model Questions Vol1 2018 Agricultural Science Question 33
Practice objective / multiple choice question 33 from the 2018 Gce Model Questions Vol1 Agricultural Science examination.
A pesticide is applied to a field at a rate of 2.5 kg ha\(^{-1}\). The pesticide degrades following first‑order kinetics with a half‑life of 12 days. The maximum residue limit (MRL) for the harvested crop is 0.05 mg kg\(^{-1}\). The crop yields 8 t ha\(^{-1}\) fresh weight. Assuming the residue concentration in the crop (mg kg\(^{-1}\)) is given by \(\dfrac{A(t)\times10^{6}}{Y}\), where \(A(t)\) is the amount of pesticide remaining on the field (kg ha\(^{-1}\)) at time \(t\) and \(Y\) is the yield in kilograms per hectare, determine the minimum number of whole days that must elapse between application and harvest so that the residue does not exceed the MRL.
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This is Gce Model Questions Vol1 2018 Agricultural Science Question 33. It is one of the objective questions from the 2018 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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