A 3‑hectare field is suffering a fungal disease that has a 12 % incidence. Each plant yields 0.8 kg of crop. The farmer intends to spray a fungicide that must be applied at a rate of 2.5 L per hectare with a concentration of 0.2 % (active ingredient). The fungicide is sold in 5‑L containers at a concentration of 0.5 %.

(a) How many containers must the farmer purchase to treat the whole field?
(b) What is the total amount of active ingredient applied per hectare (in millilitres)?
(c) Which component of the disease triangle is being directly affected by the fungicide application?

Question

A 3‑hectare field is suffering a fungal disease that has a 12 % incidence. Each plant yields 0.8 kg of crop. The farmer intends to spray a fungicide that must be applied at a rate of 2.5 L per hectare with a concentration of 0.2 % (active ingredient). The fungicide is sold in 5‑L containers at a concentration of 0.5 %.

(a) How many containers must the farmer purchase to treat the whole field?
(b) What is the total amount of active ingredient applied per hectare (in millilitres)?
(c) Which component of the disease triangle is being directly affected by the fungicide application?

Accepted Answer

1 container; 5 mL per hectare; pathogen

Neco 2020 Agricultural Science Question 27

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