Calculating the Proper Amount of Fertilizer for an Application (Dry Formulations)

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Q1. If 1 lb of nitrogen is to be applied to 1,000 sq. ft. (i.e. ft2) of garden area, how much 5 – 10 – 5 is required to deliver that 1 lb of nitrogen?

Q2. How much 18 – 46 – 0 fertilizer would be needed to apply 1.5 lb P/1,000 sq. ft. to a 70,000 sq. ft. seed bed?

Recall:

• 44% of P2O5 is P
• 83% of K2O is K

Q3. You are treating a large turf complex and would like to determine how many lbs. of a 16 – 8 – 8 fertilizer should be applied to an acre of land, if the recommendation calls for 0.75 lb. of N per 1000 sq. ft.

Recall: 1 acre = 43,560 sq. ft.