4. Conclusions
Government regulators of agricultural pesticides base legally binding decisions on computer predictions. The multidisciplinary computer models used for this have two integrated components. One is hydrology engineering and the other is chemistry. The good scientific quality of the hydrology engineering component is not matched by the quality of the chemistry component. They often use chemically meaningless parameters and assumptions not based on experiments. Kinetics and mechanisms models that are based on conventional chemical kinetics, stoichiometry, and experiments have been published for pesticides in soil and water. The chemical components should now be prepared with these concepts and methods, and integrated with the hydrology engineering in new types of multidisciplinary models.
