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Influence of Application Time on Clomazone Activity in No-Till Soybeans, Glycine max

Published online by Cambridge University Press:  12 June 2017

Virginia L. Werling  and
Douglas D. Buhler
Virginia L. Werling
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Douglas D. Buhler
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
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Abstract

Clomazone at 0.7 kg ai/ha or more, applied early preplant, completely controlled weeds before planting of no-till soybeans. Under low weed density (57 plants/m2 in untreated control) in 1985, grass weed control was nearly complete and not affected by clomazone application time. Late-season broadleaf weed control was less with preemergence application of clomazone at 1.1 or 1.4 kg/ha than with an early preplant or early preplant-preemergence split application of the same clomazone rate. Addition of metribuzin at 0.2 kg ai/ha overcame this control deficiency. Under greater weed densities (330 plants/m2 in untreated control) during 1986 and 1987, early preplant-preemergence split applications gave the greatest control of both grass and broadleaf weeds throughout the growing season. Preemergence application of clomazone failed to completely control common lambsquarters emerged at the time of application. Early preplant applications failed to maintain redroot pigweed control throughout the season. Differences in soybean yield were attributed to differences in weed control. No significant carryover of clomazone residue was detected through greenhouse or field bioassays.

Keywords

Clomazone, 2- [(2-chlorophenyl)methyl] -4,4-dimethyl-3-isoxazolidinonemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onecommon lambsquarters, Chenopodium album L. #3 CHEALredroot pigweed, Amaranthus retfoflexus L. # AMAREsoybean, Glycine max (L.) MerrConservation tillageearly preplantherbicide carryovermetribuzinABUTHAMARECHEALPOLPESETFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 36 , Issue 5 , September 1988 , pp. 629 - 635
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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