Abstract
A simple model to describe the fate of herbicides in the air-water-soil system is presented. The model takes into account the relative importance of adsorbance, volatilization and degradation to describe the loss pathway of soil applied EPTC, vernolate and cycloate. The main assumptions of the model are: herbicide adsorption onto soil according to the Freundlich empirical law; herbicide volatilization dependence on concentration; herbicide degradation rate according to first-order kinetics. The experimental data obtained following the addition of EPTC, vernolate, and cycloate to a Fluvisol showed that adsorption and volatilization explained the different loss pathway of the 3 herbicides in the air-water-soil system.
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