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Fertilizer Flux into Two Florida Lakes via Seepage¹

ABSTRACT

Excessive fertilization of a 4.8-ha citrus grove with 900 kg N/ha resulted in leaching of nitrate through the soil and seepage of ground water with high nitrate levels into Lake Conway, Florida. A total of about 270 kg of N seeped into the lake from the single fertilization event, representing about 6% of the total applied fertilizer N. In comparison, seepage measurements at five other lake sites had much lower concentrations and fluxes of nitrate, even though three of the sites were located adjacent to fertilized agricultural or urban areas. Normal fertilization practices did not appear to enhance seepage fluxes of nutrients to lakes.

Key Words: nutrient loading • ground water • eutrophication • agricultural nutrients • nitrate

¹ Contribution 07-80-05 from the Dep. of Environ. Eng. Sci., Univ. Florida, Gainesville, FL 32611. Research supported by the U.S. Army Corps of Eng. and Florida Dep. of Environ. Regulation.

² Assistant in Engineering and Professor, respectively, Environ. Eng. Sci., Univ. Florida, Gainesville, Current address of C. R. Fellows: Water and Air Research, Inc., Gainesville, Fla.

Received for publication June 9, 1980.