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Zinc Antagonizes Glyphosate Efficacy on Yellow Nutsedge (Cyperus esculentus)

Published online by Cambridge University Press:  20 January 2017

H. F. Abouziena ,
R. A. Elmergawi ,
S. Sharma ,
A. A. Omar  and
M. Singh
H. F. Abouziena*
Affiliation:
Botany Department, National Research Centre, Dokki, Cairo, Egypt
R. A. Elmergawi
Affiliation:
Botany Department, National Research Centre, Dokki, Cairo, Egypt
S. Sharma
Affiliation:
University of Florida, Institute of Food and Agriculture Science, Horticultural Science Department, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
A. A. Omar
Affiliation:
University of Florida, Institute of Food and Agriculture Science, Horticultural Science Department, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850-2299 Faculty of Agriculture, Biochemistry Department, Zagazig University, Egypt
M. Singh
Affiliation:
University of Florida, Institute of Food and Agriculture Science, Horticultural Science Department, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850-2299
*
Corresponding author's E-mail: abouzainah@yahoo.com
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Abstract

Growers of glyphosate-resistant crops apply micronutrients tank-mixed with glyphosate to save time and production costs. Therefore, effect of zinc (Zn), as Zn sulfate, on absorption, translocation, and efficacy of glyphosate on yellow nutsedge was investigated. Glyphosate at 850 g ae ha−1 provided 90% yellow nutsedge control at 5 wk after treatment (WAT). Presence of Zn at 1,000 ppmw in the glyphosate spray solution reduced yellow nutsedge control to 24 and 8%, 3 and 5 WAT, respectively. Yellow nutsedge control decreased with increasing Zn level (500 to 2,000 ppmw) in the spray solution. Yellow nutsedge treated with higher rates of Zn tank-mixed with glyphosate produced more tubers and tillers per plant than untreated plants. An abrupt decrease in absorption and translocation of 14C–glyphosate occurred between 500 and 1,000 ppmw Zn. The antagonistic effect of Zn on glyphosate depended mainly on reduced absorption and translocation of 14C–glyphosate within treated tissues. Less than 10% of applied 14C–glyphosate was absorbed when glyphosate was mixed with 1,000, 2,000, or 4,000 ppmw Zn as compared with 85% absorption for glyphosate alone. These treatments inhibited > 90% of 14C–glyphosate translocation out of the treated leaf and > 50% of tuber translocation relative to glyphosate alone. Results indicate that micronutrients containing Zn are not suitable for tank-mixing with glyphosate.

Keywords

Glyphosateyellow nutsedge, Cyperus esculentus L. CYPESAbsorptionammonium sulfateantagonismherbicide efficacytank mixturetranslocation

Information

Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 57 , Issue 1 , February 2009 , pp. 16 - 20
Copyright
Copyright © Weed Science Society of America 

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