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Accepted manuscript

Tolerance of Cotton to Herbicide-Coated Fertilizers

Published online by Cambridge University Press:  13 January 2025

Summer L. Linn Open the ORCID record for Summer L. Linn [Opens in a new window] ,
Jason K. Norsworthy Open the ORCID record for Jason K. Norsworthy [Opens in a new window] ,
Pamela Carvalho-Moore Open the ORCID record for Pamela Carvalho-Moore [Opens in a new window] ,
Tristen H. Avent Open the ORCID record for Tristen H. Avent [Opens in a new window] ,
Tom Barber Open the ORCID record for Tom Barber [Opens in a new window] ,
Trenton L. Roberts Open the ORCID record for Trenton L. Roberts [Opens in a new window]  and
Ben Thrash Open the ORCID record for Ben Thrash [Opens in a new window]
Summer L. Linn*
Affiliation:
Graduate Research Assistant, Department of Crop, Soil, and Environmental Sciences, University of Arkansas Fayetteville, AR, USA
Jason K. Norsworthy
Affiliation:
Distinguished Professor and Elms Farming Chair of Weed Science, Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
Pamela Carvalho-Moore
Affiliation:
Graduate Research Assistant, Department of Crop, Soil, and Environmental Sciences, University of Arkansas Fayetteville, AR, USA
Tristen H. Avent
Affiliation:
Graduate Research Assistant, Department of Crop, Soil, and Environmental Sciences, University of Arkansas Fayetteville, AR, USA
Tom Barber
Affiliation:
Professor and Extension Weed Scientist, Cooperative Extension Service, Lonoke, AR, USA
Trenton L. Roberts
Affiliation:
Interim Department Head and Professor of Soil Fertility and Soil Testing, Department of Crop, Soil, and Environmental Sciences, University of Arkansas Fayetteville, AR, USA
Ben Thrash
Affiliation:
Assistant Professor, Cooperative Extension Service, Lonoke, AR, USA.
*
Author for correspondence: Summer L. Linn: summerp@uark.edu
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Abstract

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Cotton producers need residual herbicides that can safely and practically be applied postemergence (POST). Herbicide-coated fertilizers could allow for simultaneous application of residual herbicides and a bulk fertilizer blend. Therefore, a study was conducted in 2022 and 2023 in Fayetteville, AR, to evaluate cotton tolerance to 12 herbicide treatments coated onto a fertilizer blend and applied over cotton. Herbicides and rates evaluated included: diuron at 840 g ai ha-1, florpyrauxifen-benzyl at 29 g ai ha-1, flumioxazin at 105 g ai ha-1, flumioxazin plus pyroxasulfone at 70 + 90 g ai ha-1, fluridone at 168 g ai ha-1, fluometuron at 840 g ai ha-1, fomesafen at 280 g ai ha-1, pyroxasulfone at 128 g ai ha-1, saflufenacil at 66 g ai ha-1, saflufenacil plus dimethenamid-P at 25 + 219 g ai ha-1, saflufenacil plus pyroxasulfone at 44 + 91 g ai ha-1, and S-metolachlor at 1388 g ai ha-1. In both years, fluridone, fluometuron, diuron, and S-metolachlor caused less than 10% injury at 7 d after treatment (DAT). Higher injury levels were observed in 2022 (19 to 30%) compared to 2023 (4 to 12%) for flumioxazin, fomesafen, saflufenacil, saflufenacil plus dimethenamid-P, and saflufenacil plus pyroxasulfone. The elevated injury in one of two years was attributed to the presence of dew when the herbicide-coated fertilizer was applied. The initial injury was transient, as the cotton generally had recovered by 28 DAT for all herbicides. No differences in seed cotton yield or groundcover among the herbicide treatments occurred either year. These results highlight the potential of using several POST-applied, residual herbicides coated on fertilizer that are not currently registered for over-the-top use in cotton.

Type
Research Article
Information
Weed Technology , Accepted manuscript , pp. 1 - 23
Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - ND
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives licence (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is unaltered and is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use or in order to create a derivative work.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Weed Science Society of America