DISAPPEARANCE OF RESIDUAL FENVALERATE FROM SUGARCANE TRASH AS AFFECTED BY TRASH PLACEMENT IN SOIL1,2

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Abstract
In laboratory study, the disappearance of residual fenvalerate [(RS)-.alpha.-cyano-3-phenoxybenzyl (RS)-2-(4-chlorophenyl)-3-methylbutyrate] from sugarcane trash as affected by trash placement in soil was studied. There was no preferential disappearance of either enantiomeric pair of optical isomers (RR, SS). Total fenvalerate recovery after 12 wk of incubation in the dark at -0.3 bar water potential under CO2-free air was about 46, 41, 58, 63, and 14%, respectively, for the soil-only, trash-only, surface-applied, incorporated, and layered soil/sugarcane trash treatments. Fenvalerate disappearance apparently was a microbial process in all treatments and, in the latter 3 treatments, was directly related to the level of microbial activity as measured by total respiratory CO2 evolution.

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