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Phytotoxicity, Adsorption, and Mobility of Metribuzin and Its Ethylthio Analog as Infuenced by Soil Properties

Published online by Cambridge University Press:  12 June 2017

Daniel C. Peek  and
Arnold P. Appleby
Daniel C. Peek
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
Arnold P. Appleby
Affiliation:
Dep. Crop Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

The phytotoxicity, adsorption, and mobility of metribuzin and ethyl-metribuzin3 were studied in five soils to determine if differential soil behavior could explain: a) the greater activity of both chemicals in western Oregon than in eastern Oregon, and b) the greater activity of metribuzin than ethyl-metribuzin under similar conditions. Metribuzin had higher activity on oats than ethyl-metribuzin in all soils and in quartz sand. Metribuzin was adsorbed less and moved more than ethyl-metribuzin in all soils. Activity of both herbicides decreased as sand content increased, and activity in quartz sand was lower than in soil. Activity of both herbicides increased in a bioassay in which leaching was prevented, indicating that leaching may be important in the loss of activity of metribuzin and ethyl-metribuzin. Lowest herbicide adsorption and greatest movement were observed in coarser textured soils.

Keywords

Metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneethyl-metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(ethylthio)-1,2,4-triazin-5(4H)-oneoats, Avena sativa L. ‘Cayuse’Herbicide leaching
Type
Soil, Air, and Water
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 419 - 423
Copyright
Copyright © 1989 by the Weed Science Society of America 

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