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SE—Structures and Environment: Optimal Light Integral and Carbon Dioxide Concentration Combinations for Lettuce in Ventilated Greenhouses

✍ Scribed by K.P. Ferentinos; L.D. Albright; D.V. Ramani

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
212 KB
Volume
77
Category
Article
ISSN
0021-8634

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✦ Synopsis

Carbon dioxide enrichment and supplemental lighting in greenhouse facilities are common procedures for improving production rates. Carbon dioxide enrichment is usually used to decrease the amount of supplemental lighting, as it is a much less expensive process. However, it is economically prohibitive to maintain elevated CO concentrations inside the greenhouse during periods of high ventilation rates. In this work, a crop-speci"c model is developed for lettuce. The model searches for the economically optimal daily light (photosynthetically active radiation*PAR) integral and CO concentration combinations. This takes into account the ventilation rate, the environmental PAR integral, and the acceptable values of target combinations of PAR integral and CO concentration, for the speci"c crop plant (lettuce). The optimal combinations achieve operating savings for the greenhouse facility.

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