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Effects of Red-light Intensity on the Growth of Waterstargrass, Coontail, and Duckweed

Published online by Cambridge University Press:  12 June 2017

Robt. E. Wilkinson
Robt. E. Wilkinson*
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Middle Rio Grande Branch Station, Route 1, Box 28, Los Lunas, New Mexico 87031
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Abstract

The minimum red-light (> 590 mμ.) intensities from fluorescent tubes at which growth or maintenance of original fresh weight were obtained at 20 C in a growth chamber for 28 days were 11–20 foot-candles for waterstargrass (Heteranthera dubia [Jacq.] Mac M.) and 12–45 foot-candles for coontail (Ceratophyllum demersum L.). Duckweed (Lemna minor L.) frond number increased significantly at 45 foot-candles red light, and the fresh weight probably increased at 45 foot-candles. The intensites of 11–45 foot-candles constituted 1.0–3.8 percent of the red portion of full sunlight.

Type
Research Article
Information
Weeds , Volume 12 , Issue 4 , October 1964 , pp. 312 - 313
Copyright
Copyright © 1964 Weed Science Society of America 

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References

Literature Cited

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