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Sorption, Degradation, and Mineralization of Carbaryl in Soils, for Single-Pesticide and Multiple-Pesticide Systems

Soil and Water Science Dep., Univ. of Florida, Gainesville FL 32611.

^* Corresponding author (kizza{at}gnv.ifas.ufl.edu).

ABSTRACT

Sorption, degradation, and mineralization of carbaryl (1-naphthyl N-methylcarbamate) alone and in mixtures with atrazine(2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) and diuron (N'-(3,4-dichlorophenyl)-N,N-dimethylurea) were characterized for two topsoils and their respective subsoils. In general, differences in sorption and transformation between single and multiple-pesticide systems were less than differences due to soil type and between topsoil and subsoil. For a given soil, the topsoil containing more organic carbon (OC) than the subsoil exhibited a larger value for the Freundlich sorption coefficient (K_t). Similarly, a larger value for the soil solution degradation rate coefficient (k₁) was obtained from topsoil than subsoil, likely due to greater microbial activity in the topsoil. However, for all soils, sorption of carbaryl on soils considerably increased the magnitude of the degradation half-life (t_1/2) for carbaryl in either single-pesticide or multiple-pesticide systems. In soils that contained <10 g kg^–1 OC content, the effect of multiple-pesticide systems was to enhance the mineralization of carbaryl. This was attributed to cometabolism. This study shows that carbaryl chemodynamic parameters (K_oc and t_1/2 values) can be used to adequately analyze the fate of carbaryl in the environment even when carbaryl exists in a mixture with atrazine and diuron.

Florida Agric. Exp. Stn. Journal Series no. R-06504.

Received for publication June 5, 1997.

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