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Effects of Additives on Efficacy, Uptake, and Translocation of Chlorimuron Ethyl Ester

Published online by Cambridge University Press:  12 June 2017

Robert J. Fielding  and
Edward W. Stoller
Robert J. Fielding
Affiliation:
Dep. Agron., 1102 S. Goodwin Ave.
Edward W. Stoller
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., Dep. Agron., Univ. Ill., 61801
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Abstract

Effects of a 28% N solution containing urea and ammonium nitrate (28% UAN) and a nonionic surfactant on efficacy, uptake, and translocation of chlorimuron ethyl ester in soybean and broadleaf weeds were investigated. Chlorimuron applied postemergence at 8.8 and 13 g ai/ha with either nonionic surfactant at 0.25% (v/v), 28% UAN at 9.4 L/ha, or nonionic surfactant plus 28% UAN controlled weeds better than without additives. Chlorimuron with nonionic surfactant and with 28% UAN controlled weeds similarly but with 28% UAN injured soybeans least. Chlorimuron with nonionic surfactant plus 28% UAN controlled velvetleaf best but injured soybeans most. Less than 2% of applied 14C-chlorimuron was absorbed in velvetleaf 84 h after treatment (HAT) when no additive was present, but adding nonionic surfactant, 28% UAN, and nonionic surfactant plus 28% UAN resulted in 21, 9, and 32% uptake, respectively, 84 HAT. Nonionic surfactant plus 28% UAN also increased translocation (primarily acropetal) of the 14C. Adding 28% UAN increased 14C-chlorimuron uptake in velvetleaf grown at low fertility but had no effect under high fertility.

Keywords

Chlorimuron, 2-[[[[(4-chloro-6-methoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acidsoybean, Glycine max (L.) Merr., ‘Williams 82’velvetleaf, Abutilon theophrasti Medik. ♯3 ABUTHSurfactant28% urea ammonium nitrateadditive
Type
Research
Information
Weed Technology , Volume 4 , Issue 2 , June 1990 , pp. 264 - 271
Copyright
Copyright © 1990 Weed Science Society of America 

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