Abstract

Abstract The release rate of diazinon, ethoprophos, and fensulfothion insecticides from different granular formulations, under conditions of simulated rainfall, showed that rapid release was obtained from a pharmaceutical-type core The release rate of these insecticides, from granular core formulations on the surface of moist soils, depended on the water solubility of the insecticide and also on the properties of the core formulation, a megsite adsorbent clay core releasing more pesticide than a coated clay core. The depth of diffusion of diazinon, ethoprophos, and fensulfothion was found to increase in soils with a low bulk density and clay mineral content. Ethoprophos, with the highest water solubility, diffused to the greatest depth. Adsorption isotherms showed good correlation with percentage organic matter in the soils, but the depth of diffusion showed that organic matter had little effect on the diffusion process. The order of increasing adsorption with soils was found to be ethoprophos, diazinon, fensulfothion.

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