A new report by Environment Maryland details the harmful effects of lawn fertilizer on the Chesapeake Bay and explains the steps that should be taken to reduce this pollutant and clean up local waterways.
Lawn fertilizer contains the nutrients nitrogen and phosphorus, which are major sources of pollution in the Bay and its rivers. When homeowners apply too much fertilizer to their lawns, the nutrients can run off into local storm drains when it rains. Excess nutrients can also seep into groundwater, which eventually makes its way into the Bay's streams and rivers.
Turf grass is now the largest crop in Maryland. In 2009, 1.3 million acres were planted with turf, compared with 1.5 million acres for all other crops combined. While farmers are required to develop nutrient management plans and control polluted runoff on their land, there are few rules for homeowners and lawn care companies to follow for fertilizer applications.
The Maryland Department of Agriculture reports that “nonfarm use” of fertilizer is quickly catching up with farm fertilizer sales. Estimates suggest that Maryland landowners apply approximately 86 million pounds of nitrogen fertilizer to their lawns each year. According to the report, researchers monitoring one suburban stream near Baltimore found that 56 percent of the nutrients in the water came from lawn fertilizer.
The report concludes that to reduce pollution for lawn fertilizer, lawmakers need to take two broad steps: limit the amount and type of nutrients in the fertilizer itself, and ensure that homeowners and lawn care companies apply less fertilizer to the ground.
For more information, download the full lawn fertilizer report, “Urban Fertilizers and the Chesapeake Bay: An Opportunity for Major Pollution Reduction.