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Carryover Injury of Clomazone Applied in Soybeans (Glycine max) and Fallow

Published online by Cambridge University Press:  12 June 2017

William H. Ahrens  and
E. Patrick Fuerst
William H. Ahrens
Affiliation:
Dep. Agron., Washington State Univ., Pullman, WA 99164
E. Patrick Fuerst
Affiliation:
Dep. Crop Weed Sci., N. D. State Univ., Fargo 58105
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Abstract

Field experiments were conducted to determine wheat injury following clomazone application in soybeans and fallow in North Dakota. Clomazone at recommended rates generally caused 10% or less visible chlorosis in spring wheat planted 11 to 12 mo after application or winter wheat planted 11 mo after application, although greater chlorosis was observed in two of seven location/year environments. Tillage preceding wheat planting increased chlorosis from clomazone residues in some environments. Clomazone residues reduced wheat grain yield only in three of seven location/year environments and usually at application rates of 1.4 kg ai ha-1 or greater. Severe drought prevailed during the study and probably increased clomazone persistence and wheat chlorosis. Drought also may have limited expression of grain yield reductions attributable to clomazone residues.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonesoybeans, Glycine max (L.) Merr. ‘McCall’wheat, Triticum aestivum L. ‘Stoa’ and ‘Seward’Chemical fallowdissipationpersistencewheatTriticum aestivum
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 855 - 861
Copyright
Copyright © 1990 Weed Science Society of America 

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