Abstract
The vertical movement of oxamyl applied to the top soil was described by the differential equation consisting of dispersion coefficient, pore-water velocity, Freundlich's constants for adsorption, soil water content, soil stationary water ratio, soil bulk density, distance from the surface, and elution time. The exponential degradation rate obtained from an indoor experiment was also taken into account for the calculation. The pore-water velocity was shown to be positive for period of rain and negative for period of no rain reflecting evaporation of water from soil surface. The observed data for 19 days required different values of dispersion coefficient (D) for different stages of simulation, i. e., D=3.0cm2/hr for 24hr just after the application of oxamyl, D=0.2cm2/hr for each period of rain, and D=0.02cm2/hr for each period of no rain. The simulation shows that most of oxamyl stays in the top 20cm layer and very few reaches the layer below 60cm under the conditions of usual rainy season, although oxamyl shows a drastic vertical movement within the top 3.5cm layer.
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