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Sorption and Degradation of Thiobencarb in Three Florida Soils

Published online by Cambridge University Press:  12 June 2017

Michael P. Braverman ,
Joan A. Dusky ,
Salvadore J. Locascio  and
Arthur G. Hornsby
Michael P. Braverman
Affiliation:
Vegetable Crops Dep., Univ. Florida, Gainesville, FL 32611
Joan A. Dusky
Affiliation:
Vegetable Crops Dep., Univ. Florida, Gainesville, FL 32611
Salvadore J. Locascio
Affiliation:
Vegetable Crops Dep., Univ. Florida, Gainesville, FL 32611
Arthur G. Hornsby
Affiliation:
Soils Dep., Univ. Florida, Gainesville, FL 32611
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Abstract

Laboratory studies were conducted to characterize the adsorption-desorption and degradation of thiobencarb in soil. Thiobencarb adsorption on soil was correlated with soil organic carbon (r = 0.97) and values (ml g−1) for the following soils were: Pahokee muck 339, Everglades muck 169, and Immokalee sand 14. The adsorption values (ml g−1) per unit of organic carbon were Immokalee sand 1195, Pahokee muck 765, and Everglades muck 539. In desorption studies, thiobencarb Kf values increased 80 ml g−1 from the first to the third desorption step in the muck soils, but were similar in three desorptions from the sand. The half-lives of thiobencarb averaged 16, 18, and 24 days on surface samples of Pahokee muck, Everglades muck, and Immokalee sand, respectively, across the range of 25 to 35 C and 10 to 100 kPa soil water tension. Half-lives were generally longer with water contents equivalent to 100 kPa than 10 kPa soil water tension and incubated at 25 than 35 C. The relative percentages of extractable 14C, bound 14C, and 14CO2 from 14C-thiobencarb-treated soil were dependent on soil type, soil water content, incubation temperature, and time.

Keywords

ThiobencarbS-[(4-chlorophenyl)methyl] diethylcarbamothioateOrganic soilssandy soilbound residues
Type
Soil, Air, and Water
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 583 - 588
Copyright
Copyright © 1990 by the Weed Science Society of America 

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