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Improving spinach, radish, and lettuce growth under red light-emitting diodes (LEDs) with blue light supplementationRadish (Raphanus sativus L. cv. Cherriette), lettuce (Lactuca sativa L. cv. Waldmann's Green), and spinach (Spinacea oleracea L. cv. Nordic IV) plants were grown under 660-nm red light-emitting diodes (LEDs) and were compared at equal photosynthetic photon flux (PPF) with either plants grown under cool-white fluorescent lamps (CWF) or red LEDs supplemented with 10% (30 micromoles m-2 s-1) blue light (400-500 nm) from blue fluorescent (BF) lamps. At 21 days after planting (DAP), leaf photosynthetic rates and stomatal conductance were greater for plants grown under CWF light than for those grown under red LEDs, with or without supplemental blue light. At harvest (21 DAP), total dry-weight accumulation was significantly lower for all species tested when grown under red LEDs alone than when grown under CWF light or red LEDs + 10% BF light. Moreover, total dry weight for radish and spinach was significantly lower under red LEDs + 10% BF than under CWF light, suggesting that addition of blue light to the red LEDs was still insufficient for achieving maximal growth for these crops.
Document ID
20040087888
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Yorio, N. C.
(NASA Kennedy Space Center Cocoa Beach FL United States)
Goins, G. D.
Kagie, H. R.
Wheeler, R. M.
Sager, J. C.
Date Acquired
August 21, 2013
Publication Date
April 1, 2001
Publication Information
Publication: HortScience : a publication of the American Society for Horticultural Science
Volume: 36
Issue: 2
ISSN: 0018-5345
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAS10-12180
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Life Support Systems
NASA Center KSC

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