Publication Date:
2011-08-24
Description:
A 50% increase in total radiation by extending the photoperiod from 16 to 24 hr doubled the weight of all cultivars of loose-leaf lettuce (Lactuca sativa L.) 'Grand Rapids Forcing', 'Waldmanns Green', 'Salad Bowl', and 'RubyConn', but not a Butterhead cultivar, 'Salina'. When total daily radiation (moles of photons) was the same, plants under continuous radiation weighed 30% to 50% more than plants under a 16 hr photoperiod. By using continuous radiation on loose-leaf lettuce, fewer lamp fixtures were required and yield was increased.
Keywords:
Man/System Technology and Life Support
Type:
HortScience : a publication of the American Society for Horticultural Science (ISSN 0018-5345); Volume 21; 1; 123-4
Format:
text
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