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Optimizing Adjuvants to Overcome Glyphosate Antagonistic Salts

Published online by Cambridge University Press:  12 June 2017

John D. Nalewaja  and
Robert Matysiak
John D. Nalewaja
Affiliation:
Crop and Weed Sci. Dep., N.D. State Univ., Fargo, ND 58105
Robert Matysiak
Affiliation:
Crop and Weed Sci. Dep., N.D. State Univ., Fargo, ND 58105
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Abstract

Glyphosate toxicity to wheat was antagonized more by calcium chloride than sodium bicarbonate. Mixtures of the salts at greater than 100 mg L−1 sodium bicarbonate and 200 mg L−1 calcium chloride were additive in antagonism of glyphosate in the greenhouse experiments. Surfactant and oil adjuvants did not overcome sodium bicarbonate or calcium chloride antagonism of glyphosate. Oil adjuvants were generally antagonistic to glyphosate. An equation is presented that determines the amount of diammonium sulfate required to overcome glyphosate antagonism based upon the sodium, potassium, calcium, and magnesium cations in the spray carrier.

Keywords

Glyphosate, N-(phosphonomethyl)glycine, wheat (Triticum aestivum L.)Water qualitysurfactantsoil adjuvantsdiammonium sulfate
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 337 - 342
Copyright
Copyright © 1993 Weed Science Society of America 

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