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Quizalofop and Sethoxydim Activity as Affected by Adjuvants and Ammonium Fertilizers

Published online by Cambridge University Press:  12 June 2017

Thomas H. Beckett ,
Edward W. Stoller  and
Loren E. Bode
Thomas H. Beckett
Affiliation:
Plant Physiol., USDA-ARS, Agron. Dep., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Edward W. Stoller
Affiliation:
Agric. Eng. Dep., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
Loren E. Bode
Affiliation:
Agric. Eng. Dep., Univ. Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801
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Abstract

Ammonium fertilizers, petroleum oil concentrate, and nonionic surfactant were evaluated as postemergence spray additives to improve giant foxtail and volunteer corn control by 28 g ai ha−1 of the ethyl ester of quizalofop or 56 g ha−1 sethoxydim. Additions of 0.25% by vol nonionic surfactant or 2.5% petroleum oil concentrate improved grass control, but additions of 10% urea ammonium nitrate (28-0-0), 10% ammonium polyphosphate (10-34-0), or 0.1M ammonium sulfate (21-0-0-24S) did not consistently affect grass control. In laboratory studies with corn, greatest 14C absorption from leaf-applied 14C-quizalofop (8 h after treatment) was found with additions of petroleum oil concentrate (80% absorbed) or nonionic surfactant (18% absorbed), while less absorption was observed with treatments containing either no additive, urea ammonium nitrate, ammonium polyphosphate, or ammonium sulfate (8 to 13% absorbed). Surface tension and droplet size of spray solutions were affected primarily by additions of nonionic surfactant, petroleum oil concentrate, and the formulated herbicides. Solution density, solute potential, pH, and buffering capacity were primarily affected by fertilizer additions.

Keywords

Quizalofop, (±)-2-[4[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onegiant foxtail, Setaria faberi Herrm. # SETFAvolunteer corn, Zea mays L. # ZEAMXAmmonium polyphosphateammonium sulfateBCH-815nonionic surfactantpetroleum oil concentrateurea ammonium nitrateSETFAZEAMX
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 12 - 19
Copyright
Copyright © 1992 by the Weed Science Society of America 

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