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Spray Droplet Residual of Glyphosate in Various Carriers

Published online by Cambridge University Press:  12 June 2017

John D. Nalewaja ,
Robert Matysiak  and
Thomas P. Freeman
John D. Nalewaja
Affiliation:
ND State Univ., Fargo, ND 58105
Robert Matysiak
Affiliation:
ND State Univ., Fargo, ND 58105
Thomas P. Freeman
Affiliation:
ND State Univ., Fargo, ND 58105
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Abstract

Scanning electron micrographs of spray droplet residual on wheat, sunflower, and kochia indicated that salts and various adjuvants applied with glyphosate affected deposit crystal content, thickness, and contact with the leaf surface. Spray deposits of glyphosate applied with diammonium sulfate contained distinct crystals, which related to enhanced toxicity of glyphosate applied alone, or to overcoming antagonism of glyphosate toxicity by calcium chloride, when applied to wheat. In general, glyphosate applied with antagonistic calcium chloride salt formed spray deposits that were amorphous, thick, and without crystals. Glyphosate sprayed with nonantagonistic diammonium sulfate and ammonium chloride salts had deposits with crystals and an evenly spread residue beneath the crystals. The various micrographs indicate that the antagonism of glyphosate phytotoxicity by salts may be in part from physical entrapment of glyphosate in the spray deposit. Glyphosate spray droplet residue contact with wheat, sunflower, and kochia surfaces related to observed differences in glyphosate toxicity to these species.

Keywords

Glyphosate, N-(phosphonomethyl)glycinekochia, Kochia scoparia (L.) Schrad. #3 KCHSCsunflower, Helianthus annuus L. # HELANwheat, Triticum aestivum L. ‘Marshall’Antagonismadjuvantsscanning electron micrographswater qualityHelianthus annuusKochia scopariaTriticum aestivumHELANKCHSC
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 40 , Issue 4 , December 1992 , pp. 576 - 589
Copyright
Copyright © 1992 by the Weed Science Society of America 

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References

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