Groundwater Loadings of Pesticides From Chemigation: A Gleams Model Simulation

by R. A. Leonard, USDA, United States,
W. G. Knisel, USDA, United States,
F. M. Davis, USDA, United States,

Document Type: Proceeding Paper

Part of: National Water Conference


This paper describes how, with slight modifications, the GLEAMS model (Groundwater Loading Effects of Agricultural Management Systems) was used to represent chemigation for herbicides, nematicides, insecticides, and fungicides applied through overhead sprinkler systems. Simulation results were compared with limited data available on soil pesticide concentrations subsequent to applications by chemigation. A 50-year climatic record at the Coastal Plain Experiment Station near Tifton, Georgia (USA) was used to demonstrate the application on two representative Coastal Plain soils. Results of the simulations are presented in the paper, and leaching losses are compared for conventional and chemigation application of pesticides.

Subject Headings: Groundwater | Load factors | Pesticides | Simulation models | Hydrologic models | Groundwater management | Systems management | Coastal plains | United States | Georgia

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