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2,4-D Interactions with Glyphosate and Sodium Bicarbonate

Published online by Cambridge University Press:  12 June 2017

Kurt D. Thelen ,
Evelyn P. Jackson  and
Donald Penner
Kurt D. Thelen
Affiliation:
Michigan Dep. Agric., P.O. Box 30017, Lansing, MI 48909
Evelyn P. Jackson
Affiliation:
Dep. Chemistry and Max T. Rogers NMR Facility
Donald Penner
Affiliation:
Dep. Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824
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Abstract

2,4-D has been reported to antagonize glyphosate activity on grass weed species. In addition, sodium bicarbonate antagonized 2,4-D activity on broadleaf species. Experiments were conducted using Nuclear Magnetic Resonance (NMR) technology to evaluate interactions of 2,4-D dimethylamine and 2,4-D butoxyethylester formulations with glyphosate in solution. The 2,4-D dimethylamine formulation associated with glyphosate to form the dimethylamine salt of glyphosate. NMR spectra also showed that the molecular orientation of the glyphosate molecule was affected by the 2,4-D butoxyethylester formulation. The antagonist was not the active 2,4-D butoxyethylester molecule itself, but appeared to be due to an association of glyphosate with organic components in the 2,4-D butoxyethylester formulation. The molecular influence of sodium bicarbonate on technical grade 2,4-D free acid, and dimethylamine and butoxyethylester formulations was also evaluated. Sodium bicarbonate was found to react with the 2,4-D free acid and 2,4-D dimethylamine to form the sodium salt of 2,4-D. The 2,4-D butoxyethylester formulation did not react with sodium bicarbonate.

Keywords

2,4-D, (2,4-dichlorophenoxy)acetic acidglyphosate, N-(phosphonomethyl)glycineAntagonismfoliar absorptionherbicide interactionnuclear magnetic resonanceNMRtank mixture
Type
Research
Information
Weed Technology , Volume 9 , Issue 2 , June 1995 , pp. 301 - 305
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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