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Effects of Selective Light Sources on Seedling Quality of Tomato and Cucumber in Closed Nursery System  

Um, Yeong-Cheol (Vegetable Research Division, NIHHS, RDA)
Jang, Yoon-Ah (Vegetable Research Division, NIHHS, RDA)
Lee, Jun-Gu (Vegetable Research Division, NIHHS, RDA)
Kim, Seung-Yu (Vegetable Research Division, NIHHS, RDA)
Cheong, Seung-Ryong (Vegetable Research Division, NIHHS, RDA)
Oh, Sang-Seok (Vegetable Research Division, NIHHS, RDA)
Cha, Seon-Hwa (Vegetable Research Division, NIHHS, RDA)
Hong, Seong-Chang (Climate Change & Agro-ecology Division, NAAS, RDA)
Publication Information
Journal of Bio-Environment Control / v.18, no.4, 2009 , pp. 370-376 More about this Journal
Abstract
To produce uniform seedlings of tomato and cucumber with inexpensive way, their seedling quality by different light sources was investigated. The raising of seedling was performed by red LED (light emitting diodes), blue LED, red-blue mixed LED or fluorescent light with a fixed PPF(photosynthetic proton flux) level, about $40{\sim}60{\mu}mol{\cdot}m^{-2}{\cdot}sec^{-1}$. In the both tomato and cucumber, the rapid extension of hypocotyledonary axis was observed in Blue LED than fluorescent light, but opposite result was found in Red and mixed LED. During the nursery period of tomato and cucumber, the fresh weight was the highest in Red LED as 74% increasement in tomato and 74% in cucumber. In the case of seedling quality after the tomato nursery, there was no difference in the positions of 1st flower cluster and the number of bearing-flower per flower cluster by each light source. In case of cucumber, until 20th node, the setting ratio of female flower was higher in LED than fluorescent treatment, and also more healthy fruit setting was found in LED. Therefore, we assume that the Red or mixed (Red 2 + Blue 1) LED is more favorable to produce high quality tomato and cucumber seedlings in closed nursery facility.
Keywords
closed plant factory; cucumber; LED; light quality; seedlings; tomato;
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