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Sethoxydim Response to Spray Carrier Chemical Properties and Environment

Published online by Cambridge University Press:  12 June 2017

John D. Nalewaja
Affiliation:
North Dakota State Univ., Fargo, ND 58105
Robert Matysiak
Affiliation:
North Dakota State Univ., Fargo, ND 58105
Edward Szelezniak
Affiliation:
North Dakota State Univ., Fargo, ND 58105

Abstract

Experiments were conducted to determine the influence of spray carrier salts, UV light, and temperature on sethoxydim phytotoxicity to oat or yellow foxtail. Spray solution pH and ions present were both important to sethoxydim phytotoxicity to oat. Sodium and calcium salts were antagonistic to sethoxydim phytotoxicity only when the spray carrier pH exceeded 7. Ammonium salts and ammonium hydroxide were synergistic with sethoxydim, and the synergism was independent of spray solution pH. Ammonium sulfate, but not ammonium hydroxide, overcame sodium bicarbonate antagonism of sethoxydim. The antagonism of sethoxydim phytotoxicity by sodium bicarbonate was greatest in the presence of UV light and most pronounced when treated plants were exposed to mid-day sunlight. Sodium bicarbonate or low temperature may reduce the speed of sethoxydim absorption allowing for greater UV degradation of unabsorbed sethoxydim on the leaf surface.

Type
Research
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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