Neco Model Questions Vol1 2023 Agricultural Science Question 5

A farmer needs to control Helicoverpa armigera on cotton using a pesticide supplied as a 250 g L⁻¹ concentrate. The recommended field rate is 0.75 L of the spray solution per hectare, applied in two equal sprays 7 days apart. The spray solution is prepared by mixing 5 mL of concentrate per litre of water (i.e., a 1:200 dilution). The farmer has a 50 L drum and intends to treat 30 ha in the first spray. Determine (a) the volume of concentrate (in mL) that must be added to the drum for the first spray, (b) the total volume of water to be added so that the drum contains the correct amount of spray solution for the first application, and (c) the total amount of active ingredient (in grams) applied per hectare over the two sprays. Give the active ingredient rounded to one decimal place.