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Mobility and Bioactivity of Thiobencarb

Published online by Cambridge University Press:  12 June 2017

Michael P. Braverman ,
Salvadore J. Locascio ,
Joan A. Dusky  and
Arthur G. Hornsby
Michael P. Braverman
Affiliation:
Vegetable Crops Dep., Univ. Florida, Gainesville, FL 32611
Salvadore J. Locascio
Affiliation:
Vegetable Crops Dep., Univ. Florida, Gainesville, FL 32611
Joan A. Dusky
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 and greenhouse studies were conducted to determine the mobility and bioactivity of thiobencarb on a Pahokee muck, Everglades muck, and Immokalee sand. On all soils > 93% of thiobencarb remained in the upper 1 cm after leaching during unsaturated flow. During saturated flow the retardation factor (RT) of thiobencarb on an Immokalee sand was 68, 20, 2, and 1 with 0, 25, 50, and 75% by volume methanol in 0.01 N CaCl2, respectively. There was a significant log-linear relationship (r2 = 0.97) between the Freundlich adsorption values (Kf) estimated from RT values and the percentage by volume methanol of the leachate. In general, thiobencarb in combination with overhead irrigation reduced lettuce vigor and plant dry weight on an Immokalee sand more than with subsurface irrigation.

Keywords

Thiobencarb, S-[(4-chlorophenyl)methyl] diethylcarbamothioatelettuce, Lactuca sativa L.Thiocarbamateleachingorganic soilssandy soils
Type
Soil, Air, and Water
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 607 - 614
Copyright
Copyright © 1990 by the Weed Science Society of America 

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