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Clomazone Dissipation in Two Montana Soils

Published online by Cambridge University Press:  12 June 2017

Eric R. Gallandt ,
Peter K. Fay  and
William P. Inskeep
Eric R. Gallandt
Affiliation:
Plant Soil Sci. Dep., Mont. State Univ., Bozeman, MT 59717-0002
Peter K. Fay
Affiliation:
Plant Soil Sci. Dep., Mont. State Univ., Bozeman, MT 59717-0002
William P. Inskeep
Affiliation:
Plant Soil Sci. Dep., Mont. State Univ., Bozeman, MT 59717-0002
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Abstract

Clomazone is effective as a chemical fallow herbicide; however, its soil residual properties in the Northern Great Plains are unknown. Clomazone was applied to soil at 0.6, 1.1, and 2.2 kg ai/ha at two locations in Montana in the spring of 1986. Soil samples were taken at each location at monthly intervals for 6 months. Residual levels of the herbicide were estimated by measuring the percent chlorosis by height in oat leaves. Clomazone at 2.2 kg ai/ha applied to a loam soil dissipated to levels below 0.1 mg/kg in 3 months and applied to a silty clay loam soil dissipated to 0.2 mg/kg 6 months after application. Half-lives (t½), determined from first-order rate plots, were 33 and 37 days in the Willow Creek loam and Bozeman silty clay loam, respectively. Thus, clomazone residue from labeled-use rates should not inhibit wheat in a wheat-fallow-wheat cropping system in Montana.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinoneoat, Avena sativa L. ‘Otana’wheat, Triticum aestivum L.Bioassayherbicide residuechemical fallow
Type
Research
Information
Weed Technology , Volume 3 , Issue 1 , March 1989 , pp. 146 - 150
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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