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Influence of carrier water pH, foliar fertilizer, and ammonium sulfate on 2,4-D and 2,4-D plus glyphosate efficacy

Published online by Cambridge University Press:  27 May 2019

Pratap Devkota Open the ORCID record for Pratap Devkota [Opens in a new window]  and
William G. Johnson
Pratap Devkota*
Affiliation:
Assistant Professor, West Florida Research and Education Center, University of Florida/IFAS, Jay, FL, USA
William G. Johnson
Affiliation:
Professor of Weed Science, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
*
Author for correspondence: Pratap Devkota, West Florida Research and Education Center, University of Florida/IFAS, 4253 Experiment Drive, Jay, FL 32565. Email: pdevkota@ufl.edu
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Abstract

Carrier water pH is an important factor for enhancing herbicide efficacy. Coapplying agrochemical products with the herbicide might save time and resources; however, the negative effect of foliar fertilizers on herbicide efficacy should be thoroughly evaluated. In greenhouse studies, the effect of carrier water pH (4, 6.5, and 9), foliar fertilizer (zinc [Zn], manganese [Mn], or without fertilizer), and ammonium sulfate (AMS) at 0% or 2.5% vol/vol was evaluated on 2,4-D and premixed 2,4-D plus glyphosate efficacy for giant ragweed, horseweed, and Palmer amaranth control. In addition, a field study was conducted to evaluate the effect of carrier water pH (4, 6.5, and 9); and Zn or Mn foliar fertilizer on premixed 2,4-D plus glyphosate efficacy for horseweed and Palmer amaranth control. In the greenhouse study, 2,4-D and premixed 2,4-D plus glyphosate provided 5% greater weed control at acidic compared with alkaline carrier water pH. Coapplied Mn foliar fertilizer reduced 2,4-D and premixed 2,4-D plus glyphosate efficacy at least 5% for weed control. Addition of AMS enhanced 2,4-D and premixed 2,4-D plus glyphosate efficacy at least 6% for giant ragweed, horseweed, and Palmer amaranth control. In the field study, few significant differences occurred between coapplied Zn or Mn foliar fertilizer for any treatment variables. Therefore, carrier water pH, coapplied foliar fertilizer, and water-conditioning adjuvants have potential to influence herbicide performance. However, weed species could play a role in the differential response of these factors on herbicide efficacy.

Keywords

Daniel Stephenson, Louisana State University Agricultural Center2,4-Dglyphosategiant ragweed, Ambrosia trifida L. AMBTRhorseweed, Erigeron canadensis (L.) ERICAPalmer amaranth, Amaranthus palmeri S. Watson AMAPACarrier water qualitycarrier water pHcoapplied foliar fertilizerwater-conditioning adjuvant
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 4 , August 2019 , pp. 562 - 568
Copyright
© Weed Science Society of America, 2019 

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