A farmer wants to correct nutrient deficiencies on a 5‑ha field. Soil tests indicate the need per hectare of $120$ kg nitrogen (N), $60$ kg phosphorus pentoxide (P₂O₅) and $47$ kg potassium oxide (K₂O). The farmer will use two fertilizers: Fertilizer A is a 20‑10‑0 blend (20 % N, 10 % P₂O₅, 0 % K₂O) and Fertilizer B is a 0‑0‑50 blend (0 % N, 0 % P₂O₅, 50 % K₂O). Determine (a) the amount of Fertilizer A and Fertilizer B required per hectare, (b) the total amount of fertilizer for the whole field, (c) the number of 50‑kg bags the farmer must purchase, and (d) the excess amount of potassium supplied per hectare because bags must be bought whole.

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Fertilizer A: 600 kg/ha; Fertilizer B: 94 kg/ha; total fertilizer: 694 kg/ha (3,470 kg for 5 ha); 70 bags of 50 kg; excess K = 53 kg per ha

Neco 2025 Agricultural Science Question 35

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