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Influence of recovery treatments on dicamba-injured soybean

Published online by Cambridge University Press:  30 July 2021

Brian R. Dintelmann ,
Shea T. Farrell  and
Kevin W. Bradley Open the ORCID record for Kevin W. Bradley [Opens in a new window]
Brian R. Dintelmann
Affiliation:
Senior Research Associate, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Shea T. Farrell
Affiliation:
Former Graduate Research Assistant, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
Kevin W. Bradley*
Affiliation:
Professor, Division of Plant Sciences, University of Missouri, Columbia, MO, USA
*
Author for Correspondence: Kevin W. Bradley, Professor, Division of Plant Sciences, University of Missouri, 201 Waters Hall, Columbia, MO 65211 Email: bradleyke@missouri.edu
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Abstract

Non-dicamba-resistant soybean yield loss resulting from dicamba off-target injury has become an increasing concern for soybean growers in recent years. After off-target dicamba movement occurs onto sensitive soybean, little information is available on tactics that could be used to mitigate the cosmetic or yield losses that may occur. Therefore, a field experiment was conducted in 2017, 2018, and 2019 to determine whether certain recovery treatments of fungicide, plant growth hormone, macro- and micronutrient fertilizer combinations, or weekly irrigation could reduce dicamba injury and/or result in similar yield to soybean that was not injured with dicamba. Simulated drift events of dicamba (5.6 g ae ha−1) were applied to non-dicamba-resistant soybean once they reached the V3 or R2 stages of growth. Recovery treatments were applied approximately 14 d after the simulated drift event. Weekly irrigation was the only recovery treatment that provided appreciable levels of injury reduction or increases in soybean height or yield compared to the dicamba-injured plants. Weekly irrigation following the R2 dicamba injury event resulted in an 1% to 14% increase in soybean yield compared with the dicamba-injured control. All other recovery treatments resulted in soybean yields that were similar to the dicamba-injured control, and similar to or lower than the nontreated control. Results from this study indicate that if soybean have become injured with dicamba, weekly irrigation will help soybean recover some of the yield loss and reduce injury symptoms that resulted from off-target dicamba movement, especially in a year with below average precipitation. However, yield loss will likely not be restored to that of noninjured soybean.

Keywords

DicambasoybeanGlycine max (L.) Merr.Off-target movementdriftyieldrecoverirrigation
Type
Research Article
Information
Weed Technology , Volume 36 , Issue 1 , February 2022 , pp. 1 - 7
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Amit Jhala, University of Nebraska, Lincoln

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