Question

You are provided with a compound fertilizer, 40-15-10.Calculate the quantity of fertilizer to add to a one hectare field supply (a)Nitrogen at 120kg/ha (b)Nitrogen at 90kg/ha (c)Phosphorus at a rate of 60kg/ha (d)Potassium at a rate of 60kg/ha

Answer 1

Answer:

a. 300 Kg of fertilizer

b. 225 Kg of fertilizer

c. 400 Kg of fertilizer

d. 600 Kg of fertilizer

Explanation:

The percentage composition ratio of Nitrogen, Phosphorus and Potassium in a 1 Kg bag of the given fertilizer is 40:15:10.

Therefore a  1 Kg bag contains;

40/100 * 1 Kg = 0.4 Kg of Nitrogen;

15/100 * 1 Kg = 0.15 Kg of phosphorus;

10/100 * 1 Kg = 0.1 Kg of potassium

Quantity of fertilizer required to add to a hectare to supply;

a. Nitrogen at 120 kg/ha = 120/0.4 = 300 Kg of fertilizer

b.. Nitrogen at 90 Kg/ha = 90/0.4 = 225 Kg of fertilizer

c. Phosphorus at a rate of 60 kg/ha = 60/0.15 = 400 Kg of fertilizer

d. Potassium at a rate of 60 kg/ha = 60/0.1 = 600 Kg of fertilizer