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2016 Vol.25, Issue 3
Comparison of Combined Light-emitting Diodes and Fluorescent Lamps for Growth and Light Use Efficiency of Red Leaf Lettuce

혼합 발광다이오드와 형광등에서 자란 적치마 상추의 생육 및 광 이용 효율 비교

Ki-Ho Son12
,
Min-Jeong Song12
,
Myung-Min Oh12*
손 기호12
,
송 민정12
,
오 명민12*
1
2
1
2
*moh@cbnu.ac.kr
30 July 2016. pp. 139-145
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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 closetype 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 (20oC, 181±4 μmol·m-2·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
키워드
식물공장
인공광원
에너지 절감
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Protected Horticulture and Plant Factory
  • Journal Title(Ko) :시설원예ㆍ식물공장
  • Volume : 25
  • No :3
  • Pages :139-145
  • Received Date : 2016-06-13
  • Revised Date : 2016-07-04
  • Accepted Date : 2016-08-04
  • DOI :https://doi.org/10.12791/KSBEC.2016.25.3.139
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