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Relationship between Light and Toxicity Symptoms Caused by Atrazine and Monuron

Floyd M. Ashton
Weeds
Vol. 13, No. 2 (Apr., 1965), pp. 164-168
DOI: 10.2307/4041161
Stable URL: http://www.jstor.org/stable/4041161
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Relationship between Light and Toxicity Symptoms Caused by Atrazine and Monuron
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Abstract

The morphological symptoms of 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (atrazine) and 3-(p-chlorophenyl)-1,1-dimethylurea (monuron) toxicity were expressed in the light but not in the dark. Various wavelengths of narrow band light were produced by the use of colored plastic filters. Oats, var Kanota, and red kidney beans were used. The degree of injury was a function of light intensity, the higher the light intensity the greater the injury. The action spectrum indicated that chlorophyll was the principal absorbing pigment involved in this injury.

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