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ORIGINAL RESEARCH article

Front. Agron.
Sec. Weed Management
Volume 6 - 2024 | doi: 10.3389/fagro.2024.1476532
This article is part of the Research Topic Methods in Weed Management View all articles

Evaluation of Residual Palmer amaranth Control with Herbicides Coated on Fertilizer

Provisionally accepted
Summer L. Linn Summer L. Linn *Jason Norsworthy Jason Norsworthy Tom Barber Tom Barber Benjamin Thrash Benjamin Thrash Trenton Roberts Trenton Roberts
  • University of Arkansas, Fayetteville, United States

The final, formatted version of the article will be published soon.

    Herbicide-coated fertilizers have the potential to provide lasting control of problematic weeds while simultaneously reducing the risk of injury to cotton, thus reducing yield penalties. Therefore, research was conducted in Fayetteville and Marianna, AR, to evaluate which herbicides coated on fertilizer provide lasting control of Palmer amaranth without increased risk of cotton injury. Eight herbicides were coated onto a blend of 196 kg ha -1 of urea and 112 kg ha -1 of muriate of potash and applied at the 6-to 8-leaf growth stage over the top of cotton. In Marianna, florpyrauxifen-benzyl provided the lowest control, which was 73% averaged over 14 and 28 d after treatment (DAT). The level of control provided by florpyrauxifen-benzyl did not differ from the other treatments in Fayetteville. While some herbicide treatments did have decreased control by 28 DAT, they were still effective, providing no less than 93% control. Palmer amaranth density differed among herbicides only in Marianna, where florpyrauxifen-benzyl-treated plots had a higher weed density. None of the herbicide treatments in either of the experiments caused any adverse effects on the crop as measured by visual injury, seedcotton yield, and crop groundcover. Most of the coated fertilizer treatments provided high levels of Palmer amaranth control and demonstrated the weed management potential of this herbicide application method. These results highlight the potential of implementing herbicides that are not labeled for over-the-top postemergence applications in cotton as coated fertilizers, as this method reduces the risk of injury and yield penalties.

    Keywords: Cotton, Herbicide-Coated Fertilizer, Muriate of potash, Residual control, Residual herbicide, Urea

    Received: 06 Aug 2024; Accepted: 08 Oct 2024.

    Copyright: © 2024 Linn, Norsworthy, Barber, Thrash and Roberts. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Summer L. Linn, University of Arkansas, Fayetteville, United States

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.