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Weed Control and Economic Returns with Postemergence Herbicides in Narrow-Row Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

William G. Johnson ,
J. Andrew Kendig ,
Raymond E. Massey ,
Michael S. Defelice  and
Chad D. Becker
William G. Johnson
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
J. Andrew Kendig
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
Raymond E. Massey
Affiliation:
Department of Agricultural Economics, University of Missouri, Columbia, MO 65203
Michael S. Defelice
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
Chad D. Becker
Affiliation:
Department of Agronomy, University of Missouri, Columbia, MO 65203
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Abstract

Field studies were conducted at three sites in 1993 and 1994 to evaluate weed control, crop response, and economic returns to 0.5× and 1× postemergence rates of chlorimuron, chlorimuron plus quizalofop, bentazon plus acifluorfen, fluazifop plus fenoxaprop, imazethapyr, and imazethapyr plus clethodim in no-till narrow-row soybean production. Common lambsquarters, ivyleaf morningglory, and common ragweed were controlled equally with 0.5× rates applied early postemergence and 1× rates applied mid-postemergence. Control of giant foxtail, large crabgrass, and common cocklebur was generally greater with 1× rates mid-postemergence than with 0.5× rates early postemergence. Soybean yields were equivalent with 0.5× and 1× rates. Soybean yields and net income were highest with 1× and 0.5× rates of chlorimuron plus quizalofop and imazethapyr plus clethodim, and metolachlor preemergence (PRE) followed by 0.5× bentazon plus acifluorfen.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidfenoxaprop, (±)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]-propanoic acidcommon cocklebur, Xanthium strumarium L. # XANSTcommon lambsquarters, Chenopodium album L. # CHEALivyleaf morningglory, Ipomeoa hederacea (L.) Jacq. # IPOHEcommon ragweed, Ambrosia artemisiifolia L. # AMBELgiant foxtail, Setaria faberi Herrm. # SETFAlarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAEconomic analysisreduced herbicide ratessoybeanAMBELCHEALDIGSAIPOHESETFAXANSTCV, coefficient of variation, EPOST, early postemergencefb, followed byMPOST, mid-postemergencePOST, postemergencePRE, preemergence
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 453 - 459
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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