WWRC 95-18
Modeling Pesticide Transport Under Field Conditions
Abstract
Abstract
The impact of pesticides on groundwater quality was studied in a two-year field experiment to
determine the movement and fate of two pesticides, picloram and dicamba, in a rangeland
soil. Computer models were used to simulate pesticide transport under field conditions. Soil
water content and pesticide concentrations were utilized to validate the mathematical models
and to describe field-scale transport processes. The computer models were applied to
simulate various physico-chemical processes in layered soils, including infiltration due to
rainfall and irrigation, evaporation, root uptake, convection, dispersion, adsorption, and
degradation. The computer models provided reasonable predictions of average water flow and
solute transport under field conditions. However, it was very challenging to simulate the
three-dimensional transport processes due to the soil heterogeneity and spatial variability.
Keywords: Numerical models. Pesticide transport. Soil heterogeneity
95-18
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