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Herbicide Dissipation from Low Density Polyethylene Mulch

Published online by Cambridge University Press:  20 January 2017

Timothy L. Grey ,
William K. Vencill ,
Theodore M. Webster  and
A. Stanley Culpepper
Timothy L. Grey*
Affiliation:
University of Georgia, Department of Crop and Soil Sciences, 6 Weed Science Annex, Tifton, GA 31794
William K. Vencill
Affiliation:
University of Georgia, Department of Crop and Soil Sciences, 4105 Plant Sciences Building, Athens, GA 30602
Theodore M. Webster
Affiliation:
Crop Protection and Management Research Unit, USDA-ARS, P.O. Box 748 Tifton, GA 31794-0748
A. Stanley Culpepper
Affiliation:
University of Georgia, Department of Crop and Soil Sciences, 6 Weed Science Annex, Tifton, GA 31794
*
Corresponding author's E-mail: tgrey@uga.edu
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Abstract

Field and laboratory studies were conducted to examine herbicide dissipation when applied to low density polyethylene (LDPE) mulch for dry scenarios vs. irrigation. Analytical chemical analysis was used for quantification. In field studies, halosulfuron, paraquat, carfentrazone, glyphosate, and flumioxazin were surface applied to black 32-μm-thick (1.25 mil) LDPE mulch. LDPE mulch harvest began 1 h after treatment (HAT) then continued every 24 h for five consecutive rain-free days after treatment (DAT) to determine the level of herbicide dissipation from the LDPE mulch surface. In a related study, treated LDPE mulch was harvested 1 HAT, then sprinkler irrigation was applied, followed by a sampling five HAT, then the same irrigation and sampling procedure was repeated every 24 h for five consecutive DAT. The order for half-life, as defined as time for 50% dissipation (DT50), varied by herbicide and method of dissipation for dry and irrigated studies. Data indicated that glyphosate and paraquat dissipation was rapid following irrigation. Glyphosate and paraquat DT50 were both 1 h in the irrigated study, but 84 and 32 h for the dry scenario, respectively. This indicated that glyphosate and paraquat could be removed from LDPE mulch with rainfall or irrigation, primarily due to their high water solubility. Halosulfuron and flumioxazin DT50 were 3 and 6 h in the irrigated study, and 18 and 57 h for the dry study, respectively. Carfentrazone DT50 was similar at 28 and 30 h for the irrigated and dry studies, respectively. This indicated that carfentrazone was adsorbed to the LDPE mulch, and irrigation water did not remove it from the LDPE mulch. Results from 14C-herbicide laboratory studies were similar to those from field studies for halosulfuron, glyphosate, paraquat, and flumioxazin.

Keywords

CarfentrazoneflumioxazinglyphosatehalosulfuronparaquatHerbicide persistenceherbicide dissipationlow density polyethylene mulchexponential decay equationhalf-life
Type
Soil, Air, and Water
Information
Weed Science , Volume 57 , Issue 3 , June 2009 , pp. 351 - 356
Copyright
Copyright © Weed Science Society of America 

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