If your brand of spreader isn't listed, look for a telephone number you can call to get the setting for your spreader. When a soil test indicates the need for phosphorus, apply turf starter fertilizer at least once a year and re-test your soil after 2 to 3 years. For soils testing low in potassium, apply winterizer or late season fertilizer at least once a year and re-test your soil after 2 to 3 years.
Turf fertilizers range widely in price.
As a general rule, the more expensive products apply more uniformly and contain nitrogen that slowly becomes available to the grass over several weeks. The results are more uniform growth and better grass color for a longer period of time. If rain is not assured within 24 hours after fertilizing, water the lawn for about 30 minutes. This initiates release of nutrients to the grass and greatly reduces the potential for contamination of lakes and streams with nitrogen and phosphorus.