본 연구는 고품질 수박 접수 및 대목의 효율적인 생산을 위한 식물공장형 육묘시스템 내 적정 기온 및 광 환경을 구명하고자 수행되었다. 서로 다른 주야간온도차를 가진 3개의 기온 처리구(25/20, 26/18, 27/16°C)와 5개의 광량 처리구(50, 100, 150, 200, 250μmol·m -2 ·s -1 )를 조합하여 총 15개의 처리구를 설정하여 수박 접수와 대목을 식물공장형 육묘시스템에 서 6일간 육묘하였다. 수박의 접수 및 대목의 묘 소질은 주야간 온도차와 광량의 개별적 영향뿐만 아니라 교호작용도 매우 크게 받았다. 수박 접수 및 대목의 하배축장은 증가되는 광량에 의해 억제되었다. 수박 접수 및 대목의 엽면적은 150μmol·m -2 ·s -1 광 조건까지는 증가하였으나, 이 이상의 광조건에서는 증가 하지 않았다. 수박 접수와 대목의 건물중 및 충실도는 증가하는 광량에 의해 높아졌으나 광이용효율은 감소하였다. 전체적으로 수박의 접수 및 대목 소질은 큰 주야간온도차 처리에서 불량해졌고, 주야간의 급격한 온도변화는 작물에게 스트레스로 작용한 것으로 판단된다. 따라서 수박 접수 및 대목의 형태, 생육, 에너지효율 등을 고려하였을 때, 식물공장형 육묘 시스템 내 수박 접수 및 대목 효율적인 생산을 위한 적정 기온 및 광량 조건은 25/20°C 및 150μmol·m -2 ·s -1인 것으로 확인되었다.

The climate change has made it difficult to produce sturdy and uniform vegetable seedlings throughout the year. Vegetable seedling production in a plant factory using artificial lighting (PFAL) is considered as an attracting alternative that can produce vegetable seedlings without outside weather conditions. This research was conducted to investigate the optimal air temperature and light intensity in a PFAL to produce sturdy and uniform watermelon scions and rootstocks efficiently. Watermelon scions and rootstocks were cultivated for six days in a PFAL under total 15 air temperature and light intensity conditions, combination of 3 air temperatures (25/20, 26/18, 27/16°C) and 5 light intensities (50, 100, 150, 200, 250 μmol·m -2 ·s -1 Photosynthetic Photon Flux). In spite of the short seedling production period, it was confirmed that the morphological characteristics of watermelon scions and rootstocks were varied according to the temperature and light intensity conditions. Hypocotyl length of watermelon scions and rootstocks was significantly affected by the light intensity than the air temperature conditions. Hypocotyl length was not elongated by the higher light intensity, however, the leaf area of watermelon scions and rootstocks were also tended to increase as the light intensity increased. This tendency was slowed down when the light intensity was above the appropriate level. Dry weight and compactness were increased as the light intensity increased, however, light use efficiency (LUE) was decreased. In the responses of watermelon scions and rootstocks for the air temperatures, the seedling quality of scions and rootstocks became poor as the difference of temperature between day and night increased. Rapid changes of air temperature in a PFAL would be a stress to the scions and rootstocks. By considering seedlings quality with energy efficiency, those results suggested that the optimal air temperature and light intensity conditions were 25/20°C and 150 μmol·m -2 ·s -1 to produce watermelon scions and rootstocks efficiently in a PFAL.

Abstract.
서 론
재료 및 방법
    1. 실험 재료 및 식물공장형 육묘시스템 내 환경
    2. 식물공장형 육묘시스템 내 주야간온도차 및 광량 처리조건
    3. 생육 조사
    4. 통계 분석
결과 및 고찰
적 요
Literature Cited

• 곽유리나(연암대학교 스마트원예계열) | Yurina Kwack (Division of Smart Horticulture, Yonam College)
• 안세웅(국립원예특작과학원 채소과) | Sewoong An (Department of Horticultural Crop Research, National Institute of Horticultural and Herbal Science) Corresponding author