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Leaching of Oxyfluorfen in Container Media

Published online by Cambridge University Press:  12 June 2017

Menashe Horowitz  and
Clyde L. Elmore
Menashe Horowitz
Affiliation:
Dep. Ornamental Hortic., Agric. Res. Orgn., Bet Dagan, Israel
Clyde L. Elmore
Affiliation:
Dep. Bot., Univ. Calif., Davis, CA 95616
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Abstract

Bentgrass was used to bioassay oxyfluorfen in leaching experiments done in columns of soilless potting media and soils, with herbicide incorporated into the upper 2 to 4 cm. Depth of herbicide leaching increased in order in the following soils: peat and sand (1:1) mix, Stockton clay soil, Yolo fine sandy loam soil, and redwood bark and sand (3:1) mix. Depth of leaching was not related to soil organic matter content. Equilibration experiments showed that peat adsorbed 4 to 5 times more oxyfluorfen than redwood bark. Less leaching was observed in potting mixtures containing peat than bark. Raising the oxyfluorfen dose from 20 to 200 ppmw increased the depth of leaching and concentration of herbicide in the leachate, while a 10-fold increase in water volume had only a limited effect. Twenty ppmw of oxyfluorfen incorporated in the top of a peat-containing potting medium has a low risk of leaching out of the container.

Keywords

Oxyfluorfen, 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzenebentgrass, Agrostis stolonifera L. cv. Seaside ♯ AGSSTAdsorptionbarkpeatsoilless potting media
Type
Research
Information
Weed Technology , Volume 5 , Issue 1 , March 1991 , pp. 175 - 180
Copyright
Copyright © 1990 by the Weed Science Society of America 

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