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1 April 2006 Soybean Response to Residual and In-Season Treatments of Trifloxysulfuron
DUNK PORTERFIELD, WESLEY J. EVERMAN, JOHN W. WILCUT
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Abstract

Experiments were conducted from 1998 to 2000 at Rocky Mount, NC, in weed-free environments to determine soybean tolerance to preplant (PP) applications of trifloxysulfuron and the potential for trifloxysulfuron applied preemergence (PRE) and postemergence (POST) to cotton to injure soybean grown in rotation the following year. Trifloxysulfuron at 3.75 and 7.5 g ai/ha applied PP 2 wk before seeding injured conventional soybean less than 5%, whereas no injury was observed when seeding was delayed 4 or 6 wk after PP treatment. No injury to sulfonylurea-resistant soybean (SR) was observed for any treatment. Soybean yields were not influenced by trifloxysulfuron treatment. Cotton injury was 7% or less with trifloxysulfuron applied PRE or POST at 3.75 and 7.5 g/ha. Trifloxysulfuron at 15 g/ha PRE or POST injured cotton a maximum of 14 to 18%. Trifloxysulfuron did not reduce cotton lint yields regardless of method or rate of application. Both conventional and SR soybean were not injured nor were yields influenced by trifloxysulfuron applied PRE or POST the previous year to cotton.

Nomenclature: Trifloxysulfuron; cotton, Gossypium hirsutum L.; soybean, Glycine max (L.) Merr.

Additional index words: Carryover, crop injury, sulfonylurea herbicide.

Abbreviations: ALS, acetolactate synthase; LPOST, late postemergence; POST, postemergence; PP, preplant; PRE, preemergence; SR, sulfonylurea-resistant.

DUNK PORTERFIELD, WESLEY J. EVERMAN, and JOHN W. WILCUT "Soybean Response to Residual and In-Season Treatments of Trifloxysulfuron," Weed Technology 20(2), 384-388, (1 April 2006). https://doi.org/10.1614/WT-05-033R.1
Published: 1 April 2006
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