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Degradation of the insecticide diazinon was followed in acid soil‐free systems and in soil systems. The mechanism of diazinon degradation in soils is a partial chemical hydrolysis with formation of 2‐isopropyl‐4‐methyl‐6‐hydroxypyrimidine and diethyl thiophosphoric acid; hydrolysis in soils is adsorption rather than acid catalyzed. Degradation rates were 11, 7, and 6% per day for Poygan sicl, Kewaunee c, and Ella Is, respectively, and these rates were related to organic matter content and pH of the soil.
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Konrad et al. (1967) studied this question.
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