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Soybean Tolerance to Early Preplant Applications of 2,4-D Ester, 2,4-D Amine, and Dicamba

Published online by Cambridge University Press:  20 January 2017

M. Angela Thompson ,
Lawrence E. Steckel ,
Andrew T. Ellis  and
Thomas C. Mueller
M. Angela Thompson
Affiliation:
Department of Plant Sciences, West Tennessee Research and Education Center, 605 Airways Blvd., Jackson, TN 38301
Lawrence E. Steckel
Affiliation:
Department of Plant Sciences, West Tennessee Research and Education Center, 605 Airways Blvd., Jackson, TN 38301
Andrew T. Ellis
Affiliation:
Department of Plant Sciences, University of Tennessee, 2431 Joe Johnson Drive, Knoxville, TN 37996
Thomas C. Mueller*
Affiliation:
Department of Plant Sciences, University of Tennessee, 2431 Joe Johnson Drive, Knoxville, TN 37996
*
Corresponding author's E-mail: tmueller@utk.edu
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Abstract

Preplant applications of two 2,4-D formulations and dicamba were evaluated for injury to no-till soybean. Herbicides applied 28 or 21 d before planting (DBP) at 0.56 kg ae/ha for the 2,4-D formulations and 0.28 kg ae/ha for dicamba did not injure soybean. At 14 DBP soybean injury was lower (< 6%) with applications of 2,4-D than with dicamba (13% to 17%). Injury increased when herbicides were applied at 7 DBP with soybean injury from both 2,4-D (< 11%) and dicamba (< 38%). When the herbicides were applied at planting soybean injury was < 18% with the 2,4-D formulations and < 73% with dicamba. Soybean yields were unaffected by the injury from herbicides applied 21, 14, and 7 DBP. However, soybean yield was decreased to 870 kg/ha in 2005 when dicamba was applied at planting compared to the nontreated check (1,950 kg/ha)

Keywords

2,4-Ddicamba–diglycolamine saltsoybean, Glycine max L.Glyphosate-resistant weed controlsoybean injuryauxin-type herbicides
Type
Research
Information
Weed Technology , Volume 21 , Issue 4 , December 2007 , pp. 882 - 885
Copyright
Copyright © Weed Science Society of America 

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