Abstract
WHERE 9,10-dihydro-8a, 10a-diazoniaphenanthrene-2A (di-quat) and 1,l′-dimethyl-4,4′-bipyridilium-2A (paraquat) are used for the control of aquatic weeds, and there is a need to measure the quantities persisting in the treated water, a sensitive bioassay, involving Lemna minor L., has been advocated1. In the course of investigations in which this procedure was used, the results were unaccountably erratic, and on further analysis it was found that the phytotoxic effects were greatly influenced by the composition of the aqueous medium, in particular the content of calcium ions.
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References
Funderburk, H. H., and Lawrence, J. M., Nature, 199, 1011 (1963).
Steinberg, R. A., J. Agric. Res., 62, 423 (1941).
Parker, C., Weed Res., 5, 181 (1965).
Yeo, R. A., Abstr. 1964 Meeting Weed Soc. of America, 107 (1964).
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PARKER, C. Influence of Water Hardness on the Phytotoxicity of Paraquat. Nature 212, 1465–1466 (1966). https://doi.org/10.1038/2121465a0
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DOI: https://doi.org/10.1038/2121465a0
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