Calculating Fertilizer - Knowledgebase Question

Streamwood, Il
Question by ronmeinhardt
July 1, 2009
How do I calculate how much fertilizer my lawn will need?

Answer from NGA
July 1, 2009


Divide rate of nitrogen desired by percent nitrogen in bag (first number of 3 on bag, use decimal form), then multiply answer found by square footage of lawn and divide by 1,000.

EXAMPLE: 15-5-10 fertilizer, 7,000 sq ft, want to apply 1 lb. nitrogen/1,000 sq ft

a. 1 lbs. divided by .15 = 6.66, round to 6.7

b. 6.7 multiplied by 7,000 = 46,900; divided by 1,000 = 46.9, or 47 pounds

Therefore, need about 47 pounds of 15-5-10 fertilizer to cover entire lawn.

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