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http://dx.doi.org/10.11614/KSL.2014.47.1.032

Effects of Light Sources, Light Quality on the Growth Response of Leafy Vegetables in Closed-type Plant Factory System  

Kim, Sang Bum (Department of Life Science, Kongju National University)
Lee, Kyung Mi (Department of Life Science, Kongju National University)
Kim, Hae Ran (Warm-Temperate and Subtropical Forest Research Center, KFRI)
You, Young Han (Department of Life Science, Kongju National University)
Publication Information
Korean Journal of Ecology and Environment / v.47, no.1, 2014 , pp. 32-40 More about this Journal
Abstract
This study was conducted to evaluate the growth response of economical six leafy vegetables that are crown daisy, pak-choi and four kinds of lettuce (Red leaf lettuce, Green leaf lettuce, Head lettuce, Romaine lettuce) by light treatment of LED in plant factory. The light treatments were composed of red, blue, red+farred, red+blue, red+blue+white LEDs, irradiation time ratio of the red and blue LED per minute (1 : 1, 2 : 1, 5 : 1, 10 : 1), and duty ratio of mixed light (100%, 99%, 97%). The following results were obtained in different LED light sources treatments: Shoot biomass and S/R ratio of romaine lettuce were the highest under mixed red+blue LEDs. S/R ratio of head lettuce was higher under mixed red+blue+white LEDs than red+blue LEDs. The others showed no difference in LED light treatment. Shoot biomass, total biomass and S/R ratio of green lettuce, head lettuce and pak-choi were highest in the higher red ratio (5 : 1) on irradiation time of red : blue LED ratios. By the different duty ratio (red+blue and red+blue+white LEDs), Under the mixed light of red+blue, shoot and root biomass of crown daisy and romaine lettuce were high in duty ratio of 100% and 99%, and S/R ratio was highest in all the 6 kinds in duty ratio of 97%. All the 6 kinds showed a fine growth state in low duty ratio (97%). Green lettuce, romaine lettuce and pak-choi showed relatively high shoot biomass and total biomass in low duty ratio of 97% under the mixed light of red+blue+white. S/R ratio of romaine lettuce and head lettuce were highest in the duty ratio of 97% with red+blue+white LEDs. Thus, we can cultivate stably without reference to external factors, if we use appropriate light sources and light quality in closed-type plant factory.
Keywords
closed-type plant factory; duty ratio; shoot biomass; S/R ratio; total biomass;
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