Lawn care, established, fertilizing
In general, lawns should be fertilized about 4 times a year with 1 lb. of nitrogen at each application. Both cool-season and warm-season grasses require 4 - 6 lbs. of actual nitrogen per year. Application rates vary depending upon the formulation and type of fertilizer used and on the turf species.
It is best for the grass and the environment if you divide the amount of fertilizer required and apply smaller quantities more frequently during the active growing season, rather than applying larger amounts less often. To avoid burning your lawn, no more than 1 pound of actual nitrogen per 1000 sq. ft. should be applied each time.
Factors to take into consideration when choosing fertilizer rate and frequency
Type of fertilizer