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Effect of Climatic Conditions on Phytotoxicity of Terbutryn

Published online by Cambridge University Press:  12 June 2017

L. F. Figuerola  and
W. R. Furtick
L. F. Figuerola
Affiliation:
Crop Science Dep., Oregon State Univ., Corvallis Oregon 97331
W. R. Furtick
Affiliation:
Crop Science Dep., Oregon State Univ., Corvallis Oregon 97331
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Abstract

Phytotoxicity of 2-(tert-butylamino)-4-(ethylamino)-6-(methylthio)-s-triazine (terbutryn) on winter wheat (Triticum aestivum Vill. ‘Host’) was investigated in a controlled environment. Highly significant differences in foliage dry weight were caused by different light intensities and rates of terbutryn. Injury symptoms appeared much earlier in plants under high light intensity. Carbon dioxide uptake by wheat plants was reduced by terbutryn at high light intensity. At low light intensity the reduction was less severe and developed later. Respiration (CO2 evolved in the dark) was reduced only by the highest rates. Terbutryn was significantly less toxic to wheat than 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine). The difference was more noticeable at low rates under high light intensity. At low light intensity no injury was observed with terbutryn.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 1 , January 1972 , pp. 60 - 63
Copyright
Copyright © Weed Science Society of America 

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