MODELING PESTICIDE DYNAMICS OF A LOAM SITE USING HERBSIM AND SIMULAT

The model systems HERBSIM and SIMULAT were applied to predict the dyna mics of three different pesticides (Simazine, Metamitron and Methabenz thiazuron) on a loam site in the Krummbach catchment, north Germany. T he parameters of the degradation model were obtained from laboratory e xperiments using statistical parameter estimation techniques. The info rmation gained from this investigation were used to simulate the herbi cide persistence under field conditions. Although not all parameters n eeded were available from laboratory studies, SIMULAT was able to repr oduce the field measurements of pesticide concentration without furthe r calibration.