The aim of this study was to use Leaching Estimation and Chemistry Model Pesticide (LEACHP), a one-dimensional environmental fate and transport model that calculates the water and chemical fluxes in soil, to evaluate the effects of the upward movement and time-dependent sorption of a pesticide in soil on its fate and transport characteristics under field conditions.  Data from three terrestrial field dissipation (TFD) studies conducted in the U.S. (Georgia, Iowa, and Nebraska) were used to simulate water, pesticide, and bromide tracer fate and transport.  Each study site was calibrated and the outputs were compared to the field data using a statistical assessment based on the Nash�Sutcliffe Equation (NSE) and percent bias.  LEACHP concentrations at a selected depth in the soil profile were also compared to the predictions by the Pesticide Root Zone Model (PRZM) model which does not take into account upwards matrix flow and kinetic sorption.

Use of LEACHP modeling to evaluate the effects of upward movement and time-dependent sorption on field soil dissipation of a pesticide

248th National Meeting (2014)

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