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Detection and Dissipation of Isoxaben and Trifluralin in Containerized Plant Nursery Runoff Water

Published online by Cambridge University Press:  12 June 2017

C. Wilson ,
T. Whitwell  and
M. B. Riley
C. Wilson
Affiliation:
Clemson University Dep. of Hortic. and Dep. of Plant Path, and Physiol., Clemson, SC 29634
T. Whitwell
Affiliation:
Clemson University Dep. of Hortic. and Dep. of Plant Path, and Physiol., Clemson, SC 29634
M. B. Riley
Affiliation:
Clemson University Dep. of Hortic. and Dep. of Plant Path, and Physiol., Clemson, SC 29634
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Abstract

Herbicides used in containerized plant production have a potential to move off-site in irrigation runoff water. A granular formulation of isoxaben plus trifluralin was applied to a commercial container plant nursery bed. Herbicides were monitored in irrigation runoff and collection pond water over a period of 60 d. Greatest quantities of both herbicides were lost during the first runoff event following application. Approximately 9.2 and 0.7% of the applied isoxaben and trifluralin, respectively, moved from the application site in runoff water within 5 d after treatment. Herbicide concentrations in runoff water were highest (0.75 μg ml−1 isoxaben and 0.08 (μg ml−1 trifluralin in 1992) during the first 0.25 h following herbicide application. Concentrations in the runoff collection pond climaxed following the first runoff event and decreased to less than 1 ng ml−1 within 60 d after treatment. Photodegradation of isoxaben within the surface 2.5 cm of pond water was greater in light as compared to dark. These studies indicate that isoxaben and trifluralin move from the site of application, but that neither accumulate in the runoff water collection ponds.

Keywords

Isoxaben, N-[3-(1-ethyl-1-methylpropyl)-5-isoxazolyl]-2,6-dimethoxybenzamidetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenamineHerbicideornamentalirrigation
Type
Soil, Air, and Water
Information
Weed Science , Volume 44 , Issue 3 , September 1996 , pp. 683 - 688
Copyright
Copyright © 1996 by the Weed Science Society of America 

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