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A Chlorophyll Assay to Assess Sethoxydim Activity in Two Grass Species

Published online by Cambridge University Press:  12 June 2017

Anne M. Smith  and
William H. Vanden Born
Anne M. Smith
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, Alta. T6G 2P5
William H. Vanden Born
Affiliation:
Dep. Plant Sci., Univ. Alberta, Edmonton, Alta. T6G 2P5
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Abstract

The influence of ammonium sulfate on the activity of sethoxydim on wild oats and barley was examined under field conditions in 1989 and 1990. A chlorophyll assay, together with plant height and dry weight determinations, was used to quantify the visual ratings for sethoxydim activity. Ammonium sulfate enhanced the activity of 75 and 150 g ai ha-1 sethoxydim in 1989. In 1990, ammonium sulfate increased the activity of the lower rate of sethoxydim only. Of the three quantitative assays, chlorophyll concentration alone differentiated the more rapid development of injury symptoms with added ammonium sulfate that was observed in the visual ratings. The chlorophyll assay was not better than the visual rating assessment, however, and appears to offer no advantages that would justify the time required.

Keywords

Sethoxydim, 2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one]barley, Hordeum vulgare L. ‘Leduc’wild oats, Avena fatua L. ♯ AVEFAAmmonium sulfatedry weightplant heightvisual ratings
Type
Research
Information
Weed Technology , Volume 5 , Issue 2 , June 1991 , pp. 355 - 362
Copyright
Copyright © 1991 Weed Science Society of America 

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