COMPUTED EFFECTS OF ADSORPTION KINETICS ON PESTICIDE MOVEMENT IN SOILS |
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| Authors: | M. LEISTRA W. A. DEKKERS |
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| Affiliation: | Laboratory for Research on Insecticides, Marijkeweg 22. Wageningen, The Netherlands;Department of Field Crops and Grassland Husbandry, Agricultural University, Haarweg 33, Wageningen, The Netherlands |
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| Abstract: | For a model at high water fluxes, the inclusion of first-order adsorption-desorption rate constants leads to slower leaching of pesticide and increased spread than predicted using instantaneous equilibrium. The initial condition of the substance near the soil surface is also found to be important. A model with simultaneous fast and slow adsorption-desorption equilibria describes and explains published experimental data comparatively well. Under a pattern of intermittent rainfall, the effect of adsorption-desorption kinetics on pesticide movement is comparatively small. |
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