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http://dx.doi.org/10.12791/KSBEC.2016.25.3.139

Comparison of Combined Light-emitting Diodes and Fluorescent Lamps for Growth and Light Use Efficiency of Red Leaf Lettuce  

Son, Ki-Ho (Division of Animal, Horticultural and Food Sciences, Chungbuk National University)
Song, Min-Jeong (Division of Animal, Horticultural and Food Sciences, Chungbuk National University)
Oh, Myung-Min (Division of Animal, Horticultural and Food Sciences, Chungbuk National University)
Publication Information
Journal of Bio-Environment Control / v.25, no.3, 2016 , pp. 139-145 More about this Journal
Abstract
The objective of this study was to compare the growth and light use efficiency of red leaf lettuce grown under three types of combined light-emitting diodes (LEDs) and fluorescent lamps (FL) in a closed-type plant production system. The eighteen days-old lettuce seedlings of red leaf lettuce (Lactuca sativa L., 'Jeokchima') were transplanted to the close-type plant production system equipped with three types of combined LEDs with red (R, 655 nm), blue (B, 456 nm), green (G, 515 nm), and white (W, 456 nm + 558 nm) (R:B=8:2, R:W:B=8:1:1, R:G:B=8:1:1) and FL. The seedlings were grown under normal growth conditions ($20^{\circ}C$, $181{\pm}4{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, 12 h photoperiod) for four weeks. Lettuce plants grown under FL had significantly higher leaf shape index than those under all LED treatments. Although growth of shoots and roots was not show any significant difference among LED treatments, all of the LED treatments induced about 34% higher shoot fresh weight than that of the FL. On the other hands, the total power consumption of FL was 145 kW for 4 weeks, while the mean value of LED treatments was 54 kW, which was about 3 times lower value than that of the FL. The light use efficiency based on dry matter in LED treatments was about 34 mg/W and this was about 3.5 times higher energy saving value than the FL. In conclusion, this study showed that irradiation of optimal combined LEDs in closed-type plant production systems can improve the lettuce growth as well as maximize in light use efficiency through energy saving than the FL.
Keywords
artificial light source; energy saving; plant factory;
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Times Cited By KSCI : 3  (Citation Analysis)
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