Supplemental Lighting by HPS and PLS Lamps Affects Growth and Yield of Cucumber during Low Radiation Period

Joon-Kook Kwon; In-Ho Yu; Kyoung-Sub Park; Jae-Han Lee; Jin-Hyun Kim; Jung-Sup Lee; Dong-Soo Lee

doi:10.12791/KSBEC.2018.27.4.400

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2018 Vol.27, Issue 4 Preview Page Next Page

Supplemental Lighting by HPS and PLS Lamps Affects Growth and Yield of Cucumber during Low Radiation Period 약광기 HPS와 PLS lamp를 이용한 오이의 보광재배효과

30 November 2018. pp. 400-406

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Abstract

In this experiment the effect of supplemental lighting on the growth and yield of cucumber (Cucumis sativus L. ‘Fresh’) plants during low radiation period of winter season were investigated in glasshouses using common high-pressure sodium (HPS) lamps and newly developed plasma lighting system (PLS) lamps. Plants grown without supplemental lighting were considered as a control. Supplemental lighting was provided from November 20th, 2015 to March 15th, 2016 to ensure 14-hour photoperiod (natural+supplemental light), also lamps were operated automatically when the outside sun radiation levels were less than 100 W·m^-2. Spectral analysis showed that HPS lamp had a discrete spectrum, lacked of the radiation in the 400-550 nm wave band (blue-green light), but had a high output in the orange-red region (550-650 nm). A higher red light output resulted in an increased red to far-red (R/FR) ratio in HPS lamp. PLS had a continuous spectrum and had a peak radiation in green region (490-550 nm). HPS has 12.6% lower output in photosynthetically active radiation (PAR) but 12.6% higher output in near infra-red (NIR) spectral regions compared to PLS. Both HPS and PLS lamps emitted very low levels of ultra-violet radiation (300-400 nm). Supplemental lighting both from HPS and PLS lamps increased plant height, leaf number, internode number and dry weight of cucumber plants compared to control. Photosynthetic activity of cucumber plants grown under two supplemental lighting systems was comparable. Number of fruits per cucumber plant (fruit weight per plant) in control, PLS, and HPS plots were 21.2 (2.9 kg), 38.7 (5.5 kg), and 40.4 (5.6 kg), respectively, thereby increasing yield by 1.8-1.9 times in comparison with control. An analysis of the economic feasibility of supplemental lighting in cucumber cultivation showed that considering lamp installation and electricity costs the income from supplemental lighting increased by 37% and 62% for PLS and HPS lamps, respectively.

Keywords

artificial lighting

greenhouse

PAR

photosynthesis

본 연구는 HPS (high-pressure sodium lamp, 고압나트 륨등, 700W)와 PLS (Plasma Lighting System, 플라즈마 등, 1,000W) 램프를 이용하여 겨울재배 오이의 보광재 배 효과를 구명하고자, 양지붕형 유리온실 3동에 무보광 을 대조구로 하여 오이(‘후레쉬’ 품종)를 2015년 11월 2 일에 정식하여 2016년 3월 15일까지 재배하였다. 보광은 2015년 11월 20일부터 2016년 3월 15일까지 약 4개월 동안 명기를 14시간/일(일몰 전 약 30분에 점등 개시)으 로 정하여 실시하였고, 낮동안의 일사량이 100W·m2 이 하일 경우 자동으로 점등이 되도록 제어하였다. 분광투 과특성은 PLS의 경우 광합성유효광(400-700nm)이 전반 적으로 고르게 분포하나 HPS는 400-550nm 광량이 매 우 적은 반면, 550-650nm 광원이 PLS보다 많이 분포되 었다. 330-1,100nm 광은 HPS가 PLS에 비해 6% 많았 고 UV와 적색광은 비슷하였다. 광합성유효광(400-700nm)은 HPS에 비해 PLS가 12.6% 많았고, 근적외선 (700-1,100nm)은 HPS에 비해 PLS가 12.6% 적었으며, R/FR은 HPS가 높았다. 오이의 초장, 엽수, 마디수, 건물 중 등의 생육은 무보광에 비해 두 보광등에서 비슷한 수준으로 높았다. 광합성능력은 두 광원 간에 유의적인 차이가 없었다. 오이의 주당 과실 개수(무게)는 무보광 21.2개(2.9kg)에 비해 PLS가 38.7개(5.5kg), HPS가 40.4 개(5.6kg)로 1.8~1.9배 많았다. 보광등의 설치비와 전기 에너지 비용을 고려하여 오이 보광재배의 경제성을 분석 한 결과, PLS와 HPS 보광등은 각각 37%와 62%의 소 득증대효과가 있었다.

키워드

인공광

온실

광합성

광합성유효광

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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 : 27
No :4
Pages :400-406
Received Date : 2018-10-02
Revised Date : 2018-10-23
Accepted Date : 2018-10-24
DOI :https://doi.org/10.12791/KSBEC.2018.27.4.400

Journal of Bio-Environment Control ISSN:1229-4675(Print) 2765-3641(Online) 생물환경조절학회지

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