Abstract
ABSTRACT A field scale model for predicting surface losses of pesticides (Pesticide Losses In Erosion and Runoff Simulator, PLIERS) is described. PLIERS accounts for pesticide losses by degradation and volatization, washoff from vegetative soil cover, and adorption and desorption to and from soil particles, and is dissolved and adsorbed forms in surface runoff. Hydrologic data are generated by the comprehensive watershed model, FESHM, which contains an enhanced sediment detachment and transport algorithm. PLIERS uses first order rate equations to describe pesticide washoff and degradation and volatilization. The adsorption of pesticides to individual particle size classes is estimated using the Freundlich equation. PLIERS was validated using atrazine and 2,4-D losses from no-till and conventionally-tilled field plots. These plots were located on a Groseclose silt loam soil and had either 0 or 750 kg/ha crop residue. Agreement between the predicted and observed data was satisfactory for both pesticides. PLIERS shows potential for use as a planning tool since it can be used with any comprehensive hydrologic model and is able to predict pesticide losses under various field conditions.
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