Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Analysis of Light Traits in a Solar Light-collector Device and its Effects on Lettuce Growth at an Early Growth Stage

태양광 집광장치의 광 특성분석 및 유묘기 상추의 생장에 미치는 영향

  • Lee, Sanggyu (Division of Smart Farm Development, National Institute of Agricultural Science, RDA) ;
  • Lee, Jaesu (Division of Smart Farm Development, National Institute of Agricultural Science, RDA) ;
  • Won, Jinho (Division of Smart Farm Development, National Institute of Agricultural Science, RDA)
  • 이상규 (농촌진흥청 국립농업과학원 스마트팜개발과) ;
  • 이재수 (농촌진흥청 국립농업과학원 스마트팜개발과) ;
  • 원진호 (농촌진흥청 국립농업과학원 스마트팜개발과)
  • Received : 2019.11.05
  • Accepted : 2019.11.19
  • Published : 2019.11.30
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Abstract

The aim of this study was to analyze the light traits in a solar light-collector device and its effects on lettuce growth at an early growth stage. The three hyper parameters used were the reflector diameter (2 cm and 4 cm), coating inside the reflector (chrome-coated, non-coated) and distance from the light fiber (15 cm and 20 cm). The results showed that light efficiency, which is the ratio of light intensity inside the fiber to the solar intensity, improved by 41.1 % when using a 2 cm diameter chrome-coated reflector at a distance of 15 cm from the light fiber; whereas it only improved by 20.6% when a non-coated reflector was used. As the reflector size was increased to 4 cm, the light efficiency for the coated and non-coated reflectors increased by 28.5 % and 26.4 %, respectively, hence, no significant difference was observed. When the light fiber was placed at a distance of 20 cm, the increase in light efficiency with coating treatment was 8 % higher than without coating treatment. We also compared the efficiency of light-fiber treatment with that of LED treatment in our lettuce nursery, and observed that the plants exhibited better growth with light-fiber treatment. We observed an average increase of 1.7 cm in leaf height, $7cm^2/plant$ increase in leaf area, and 32 mm increase in root length upon light-fiber treatment as opposed to those observed with LED treatment. These findings indicate that the collector light-fiber is economically feasible and it improves lettuce growth compared with the LED treatment.

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References

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