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Effect of Water Quality, Carrier Volume, and Acid on Glyphosate Phytotoxicity

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler  and
Orvin C. Burnside
Douglas D. Buhler
Affiliation:
Dep. Agron., Univ. of Nebraska, LIncoln, NE 68583
Orvin C. Burnside
Affiliation:
Dep. Agron., Univ. of Nebraska, LIncoln, NE 68583
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Abstract

Glyphosate [N-(phosphonomethyl)glycine] was less phytotoxic when applied in 190 L/ha of well water with ionic strengths of 0.005 or greater than in distilled water. At a carrier volume of 24 L/ha, this inhibition of glyphosate was reduced or eliminated. Glyphosate was less phytotoxic when applied in 10-mM solutions of CaCl2, FeSO4, Fe2(SO4)3, MgSO4, NaHCO3, Na2CO3, and ZnSO4 than in distilled water. Adding H2SO4, HCl, HClO4, acetic, and lactic acids at 5, 10, and 50 mM to the spray solution resulted in variable increases in glyphosate phytotoxicity. H2SO4 was the most effective acid tested in increasing glyphosate phytotoxicity when added to well water. Lowering the pH of the spray solution by using potassium biphthalate and phosphoric acid buffers did not increase glyphosate phytotoxicity.

Keywords

Herbicide carrierinhibitionpost-emergence herbicideswater hardness
Type
Research Article
Information
Weed Science , Volume 31 , Issue 2 , March 1983 , pp. 163 - 169
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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