The validation statuses of the pesticide leaching models PRZM-1, LEACHP, GLEAMS and PELMO were assessed by literature study. The required range of validity included all the situations in which pesticides are applied in Dutch agriculture and horticulture. The models should predict pesticide leaching to groundwater at concentration levels of some 0.1 Šg/l based on laboratory-measured sorption and transformation rate parameters. All the available model tests were reviewed and their soundness and relevance classified. If the test was sound, model performance was analysed. Validation statuses of the models were low to very low, considering the required range of validity and the results of the available tests.
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