Influence of soil properties on the degradation of the nematocide fenamiphos
1992
Simon, L. | Spiteller, M. | Haisch, A. | Wallnofer, P.R.
The decline and mineralization to 14CO2 of [phenyl-1-14-C]fenamiphos (f) together with the main metabolite fenamiphos sulfoxide (ox) was investigated over a period of 90 days, at two temperatures using 16 soils originating from different geographic areas (9 soils from a cool to temperate climate at 16-22 degrees C and 7 soils from a subtropical to tropical climate at 22-28 degrees C, resp.). The mineralization rates at 22 degrees C, as determined by curve fitting, were in good correlation with the % Cmic/Corg-ratio (percentage of the microbial biomass in the total organic carbon content in the soil). The degradation rates for (f) plus (ox) could be described by first-order kinetics. The half-lives at 22 degrees C ranged from 12 to 87 days. By means of a multiple computation, using regression analysis, between soil properties and decline rates it was possible to explain 70% of the total variance by differences in the pH (H2O)-values and in the % Cmic/Corg-ratio.
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