While a healthy lawn typically takes up and uses applied fertilizer for growth and protein production, nutrients may leach or run off into water bodies or groundwater when fertilizer is overapplied or applied to an unhealthy lawn. In an attempt to reduce this nonpoint source pollution, FDACS developed a rule to regulate the amount of N and P applied to lawns as fertilizer. The Urban Turf Fertilizer Rule regulates what can be sold and marketed as an urban turf fertilizer and requires specific wording on the fertilizer bag. This rule was enacted in response to concerns over potential pollution of water resources resulting from the nitrogen (N) and phosphorus (P) in these fertilizers. This 3-page fact sheet was written by Laurie E. Trenholm, and published by the UF Department of Environmental Horticulture, March 2013.
http://edis.ifas.ufl.edu/ep353