The study aimed to determine effects of light emitting diode (LED) and the ultraviolet radiation (UVA) light of plant factory on plant growth and ascorbic acid content of spinach (Spinacia oleracea cv. Shusiro). Plants were grown in a NFT (Nutrient Film Technique) system for 28 days after transplanting with fluorescent light (FL, control), LEDs and UVA (Blue+UVA (BUV), Red and Blue (R:B(2:1)) + UVA (RBUV), Red+UVA (RUV), White LED (W), Red and Blue (R:B(2:1)), Blue (B), Red (R)) under the same light intensity (130 μmol·m-2·s-1) and photoperiod (16/8h = day/night). All the light sources containing the R (R, RB, RUV, and RBUV) showed leaf epinasty symptom at 21 days after transplanting (DAT). Under the RUV treatment, the lengths of leaf and leaf petiole were significantly reduced and the leaf width was increased, lowering the leaf shape index, compared to the R treatment. Under the BUV, however, the lengths of leaf and leaf petiole were increased significantly, and the leaf number was increased compared to B. Under the RBUV treatment, the leaf length was significantly shorter than other treatments, while no significant difference between the RBUV and RB for the fresh and dry weights and leaf area. Dry weights at 28 days after transplanting were significantly higher in the R, RUV and BUV treatments than those in the W and FL. The leaf area was significantly higher under the BUV treatment. The ascorbic acid content of the 28 day-old spinach under the B was significantly higher, followed by the BUV, and significantly lower in FL and R. All the integrated data suggest that the BUV light seems to be the most suitable for growth and quality of hydroponically grown spinach in a plant factory.

Abstract
 서 론
 재료 및 방법
  식물재배 및 재배환경
  실험처리
  조사 및 측정항목
  통계분석
 결 과
 고 찰
 적 요
 Literature Cited

• 박상민(한국방송통신대학교 농학과) | Sangmin Park (Dept. of Agricultural Science, Korea National Open University)
• 조은경(한국방송통신대학교 농학과) | Eunkyung Cho (Dept. of Agricultural Science, Korea National Open University)
• 안진희(한국방송통신대학교 농학과) | Jinhee An (Dept. of Agricultural Science, Korea National Open University)
• 윤범희(한국방송통신대학교 농학과) | Beomhee Yoon (Dept. of Agricultural Science, Korea National Open University)
• 최기영(강원대학교 시설농업과) | Kiyoung Choi (Dept. of Controlled Agriculture, Kangwon National University)
• 최은영(한국방송통신대학교 농학과) | Eunyoung Choi (Dept. of Agricultural Science, Korea National Open University) Corresponding author