Modeling Pesticide Metabolite Transport with Gleams

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



Document Type: Proceeding Paper

Part of: Planning Now for Irrigation and Drainage in the 21st Century

Abstract:

The GLEAMS model (Groundwater Loading Effects of Agricultural Management Systems) was modified to simulate the generation and degradation of pesticide metabolites. Translocation of the metabolites within and through the rootzone are considered. The modifications have been verified and preliminary validation has been made. The paper presents the model concepts for metabolite generation and degradation. Results of model simulations for fenamiphos metabolite concentrations in the rootzone are compared with observed concentrations from a research location in the Georgia Coastal Plain. These additions to GLEAMS will be helpful to model users working with those pesticides that have toxic metabolites with mobility and persistence characteristics differing from those of the parent compounds.

Subject Headings: Pesticides | Mathematical models | Vegetation | Transport phenomena | Simulation models | Irrigation water | Hydrologic models | Georgia | United States

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