A soil test is necessary to determine how much phosphate, potassium, and lime may be needed. Soil tests do not generally test for nitrogen, but some nitrogen is almost always needed. A common rule for proper nitrogen fertilization is to apply 1 lb of actual nitrogen per 1000 square feet for any single application. The number of applications per year depends on the grass type, level of maintenance and can range from a single application to four applications in a year. The amount of fertilizer needed to apply 1 lb of actual nitrogen depends on the fertilizer analysis. Divide the percent nitrogen in the desired fertilizer into 100 to determine the number of pounds of that product that should be applied per 1000 square feet. For example, a 34-0-0 requires 3 lbs and a 20-3-7 requires 5 lbs of fertilizer to get 1 lb of actual N.
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