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Applicability of Artificial Light Source and Newly Developed Growing Medium for Lettuce Cultivation in a Closed-type Plant Production System

밀폐형 식물생산시스템에서 상추재배를 위한 인공광원과 신개발 배지의 적용

Hye Ri Lee1
,
Hye Min Kim5
,
Hyeon Min Kim1
,
Sang Hyun Park6
,
Seung Jae Hwang1234*
이 혜리1
,
김 혜민5
,
김 현민1
,
박 상현6
,
황 승재1234*
1Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 52828, Korea
2Department of Agricultural Plant Science, College of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea
3Institute of Agriculture & Life Sciences, Gyeongsang National University, Jinju 52828, Korea
4Research Institute of Life Science, Gyeongsang National University, Jinju 52828, Korea
5Protected Horticulture Institute, National Institute of Horticultural & Herbal Science, Rural Development Administration, Haman 52024, Korea
6Division of Research, Smithers Oasis Korea, Cheonan 31025, Korea
1경상대학교 대학원 응용생명과학부
2경상대학교 농업생명과학대학 농업식물과학과
3경상대학교 농업생명과학연구원
4경상대학교 생명과학연구원
5국립원예특작과학원 시설원예연구소
6스미더스 오아시스 코리아 연구개발팀
*Corresponding author: hsj@gnu.ac.kr
30 April 2019. pp. 134-142
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Abstract

This study was conducted to evaluate the growth characteristics of lettuce (Lactuca sativa L.) as affected by artificial light sources and different growing media in a closed-type plant production system (CPPS). The lettuce seeds were sown in the 128-cell plug tray filled with 5 different growing media such as urethane sponge (US), rockwool (RW), Q-plug (QP), TP-S2 (TP) and PU-7B (PU). The germination rate of lettuce seeds was examined during 12 days after sowing. On the 13 days after sowing, the lettuce seedlings were transplanted in a CPPS with temperature 25 ± 1°C and nutrient solution (EC 2.0 dS·m-1, pH 6.5) using recirculating deep floating technique system. The light sources were set with FL (fluorescent lamps) and combined RB LEDs (red : blue = 7 : 3) with 150 ± 10μmol·m-2·s-1 PPFD and a photoperiod of 14/10 hours (light/dark). The initial germination rate of lettuce was the highest in TP. The final germination and mean daily germination were the significantly highest in RW, QP and TP. The plant height, leaf length, leaf width, leaf area, and fresh and dry weights of shoot were the greatest in QP irradiated with RB LED. The number of leaves, fresh and dry weights of root and SPAD were the greatest in QP and TP irradiated with RB LED. The root length was the longest in TP irradiated with RB LED. Therefore, these results indicate that RB LED was effective for the growth of lettuce and it was also found that the QP and TP were effective for the germination and growth of lettuce in a CPPS. In addition, we confirmed the applicability of the newly developed growing medium TP for the lettuce production in a CPPS.

Keywords
deep floating technique
fluorescent lamp
light-emitting diode
Q-plug

본 연구는 밀폐형 식물생산시스템에서 인공광원과 배지 종류에 따른 상추의 생육 특성을 조사하기 위해 수행되었 다. 상추 종자는 5종류의 배지인 urethane sponge(US), rockwool(RW), Q plug(QP), TP-S2(TP)와 PU-7B(PU)가 충진된 128구 플러그 트레이에 파종하였다. 상추 종자의 발아율은 파종 후 12일까지 조사하였다. 상추 묘는 파종 후 13일째에 재순환 담액식 수경재배 시스템을 이용하 여 EC 2.0dS·m-1, pH 6.5와 온도 25±1°C인 밀폐형 식 물생산시스템에 정식하였다. 광원은 형광등과 RB LEDs(red:blue=7:3)를 이용하여 광주기 14/10(명기/암기), 광도 150±10μmol·m-2·s-1 PPFD로 설정했다. 상추의 초기 발아율은 TP에서 가장 높았다. 최종 발아율과 평균 발아 수는 RW, QP 및 TP 배지에서 유의적으로 높았다. 초장, 엽장, 엽폭, 엽면적, 지상부의 생체중, 건물중 모두 RB LED의 QP에서 유의성 있게 높은 값을 나타냈다. 엽수, 지하부의 생체중과 건물과 SPAD는 RB LED의 QP와 TP에서 가장 좋았고, 근장은 RB LED의 TP에서 가장 길었다. 따라서 밀폐형 식물생산시스템에서 RB LED가 상추의 생육이 우수하였으며, QP와 TP가 상추의 발아율 과 생육에 효과적인 것으로 나타났다. 뿐만 아니라, 밀 폐형 식물생산시스템에서 상추 생산 시 신개발 배지인 TP 배지의 적용가능성을 확인하였다.

키워드
담액식 수경재배
발광다이오드
형광등
Q-plug
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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 : 28
  • No :2
  • Pages :134-142
  • Received Date : 2019-02-13
  • Revised Date : 2019-04-04
  • Accepted Date : 2019-04-08
  • DOI :https://doi.org/10.12791/KSBEC.2019.28.2.134
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