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RELATIONSHIPS BETWEEN SOIL P AND P IN SURFACE RUNOFF AND SUBSURFACE DRAINAGE: AN OVERVIEW OF ONGOING RESEARCH

Nonpoint source pollution from agricultural fields has the potential to accelerate eutrophication of freshwater ecosystems. In a report of water quality in the United States, the Environmental Protection Agency sited agriculture as the primary source of pollution in 60% of impaired river miles, 30% of the impaired lake acres and 15% of estuarine square miles (EPA, 1998). Phosphorus, in particular, has received much attention due to its role as limiting nutrient in many freshwater ecosystems (Correll, 1998). The application of P as inorganic fertilizers or manure is a common practice to maintain soil P at levels that optimize crop growth. However, soil P levels in many areas of the country are now above levels required to optimize crop production (PPI, 2001). This increase in soil P levels increases the risk of limnologically significant P concentrations reaching surface waters and accelerating eutrophication.