Gce Model Questions Vol1 2019 Agricultural Science Question 19
Practice objective / multiple choice question 19 from the 2019 Gce Model Questions Vol1 Agricultural Science examination.
A pesticide is applied at a rate of 2.5 L ha⁻¹ per application to a 5‑ha field. The pesticide has a half‑life of 7 days, so after d days the remaining proportion is \((½)^{d/7}\). To keep the pest population below the economic threshold, the concentration must remain at least 30 % of the initial dose after each interval. The crop season lasts 60 days. Assuming applications are spaced equally and no other control measures are used, (a) what is the maximum allowable interval between applications (in days, to two decimal places), and (b) how many liters of pesticide are required for the whole season?
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About This Question
This is Gce Model Questions Vol1 2019 Agricultural Science Question 19. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Agricultural Science examination.
Difficulty level: Medium .
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