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Effect of Inorganic Salts on the Toxicity and Translocation of Glyphosate and MSMA in Purple Nutsedge (Cyperus rotundus)

Published online by Cambridge University Press:  12 June 2017

Gene D. Wills  and
Chester G. McWhorter
Gene D. Wills
Affiliation:
Plant Physiol., Delta Branch, Mississippi Agric. and For. Exp. Stn. and South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric, Stoneville, MS 38776
Chester G. McWhorter
Affiliation:
Plant Physiol., Delta Branch, Mississippi Agric. and For. Exp. Stn. and South. Weed Sci. Lab., Agric. Res. Serv., U.S. Dep. Agric, Stoneville, MS 38776
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Abstract

The effects of several inorganic salts on the toxicity and translocation of nonradiolabeled and 14C-radiolabeled MSMA (monosodium salt of MAA) and the isopropylamine salt of glyphosate [N-(phosphonomethyl)glycine] following foliar applications to purple nutsedge (Cyperus rotundus L. ♯ CYPRO) were evaluated. Salts of the monovalent cations NH4+, K+, and Na+ and to a lesser degree the anion PO4 generally resulted in increased toxicity of these herbicides. Salts of the divalent and trivalent cations Zn++ and Fe+++ frequently reduced the activity of glyphosate and MSMA, whereas salts of the divalent Ca++ ion caused little or no effect on activity. Salts of the anions Cl–, NO3–, CO3—-, and SO4– resulted in increased, decreased, or unchanged glyphosate toxicity as influenced by the associated cation. Translocation of the radiolabel of 14C-glyphosate and 14C-MSMA was increased by the addition of NH4Cl, while retention of the radiolabel within the tissue of the treated area was increased by the addition of FeCl3 to the treated leaf surface.

Keywords

Herbicideweed controlherbicide absorptionCYPRO
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 6 , November 1985 , pp. 755 - 761
Copyright
Copyright © 1985 by the Weed Science Society of America 

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