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You've been told to apply 1 lb of Nitrogen per 1,000 square feet. How do you determine how much fertilizer you need in order to get 1 lb of N per 1,000 sq.ft?
Divide the first number in the fertilizer analysis into 100. For example, you have a 1,000 square foot stand of turf that requires 1 lb. of Nitrogen in a complete formulation. Your fertilizer is 16-4-8, so you just do the math:
100 / 16 = 6.25
You need 6.25 lbs of fertilizer.