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Effects of Light Quality on the Life Cycles of Crabgrass and Barnyardgrass

Published online by Cambridge University Press:  12 June 2017

Stuart Dunn ,
G. K. Gruendling  and
Aubrey S. Thomas Jr.
Stuart Dunn
Affiliation:
Botany Department, Agricultural Experiment Station, University of New Hampshire, Durham, New Hampshire
G. K. Gruendling
Affiliation:
Botany Department, Agricultural Experiment Station, University of New Hampshire, Durham, New Hampshire
Aubrey S. Thomas Jr.
Affiliation:
Botany Department, Agricultural Experiment Station, University of New Hampshire, Durham, New Hampshire
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Abstract

Large Crabgrass (Digitaria sanguinalis (L.) Scop.) and barnyardgrass (Echinochloa crusgalli (L.) Beauv.) plants were grown from seedlings to maturity under five light qualities of equal energy levels. For crabgrass, both fresh and dry weight yields of plant tops grown under red light and under cool white light were significantly greater than those under green, yellow, or blue light. Length of stem followed this same order. Effects of light quality on reproduction were not as consistent; green and blue light caused the largest numbers of seed heads to form, while yellow light delayed flowering and resulted in the least number and weight of seed heads. Somewhat similar responses to light were found with barnyardgrass plants, except that yields under yellow light were close to those under red light for this species. Blue light caused smallest plants in both kinds of weeds.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 1 , January 1968 , pp. 58 - 60
Copyright
Copyright © 1968 Weed Science Society of America 

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References

Literature Cited

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