배양액 농도와 광도가 식물공장에서 재배되는 적축면 상추의 생장에 미치는 영향

Growth Response of Lettuce to Various Levels of EC and Light Intensity in Plant Factory

  • 차미경 (제주대학교 식물자원환경전공) ;
  • 김주성 (제주대학교 식물자원환경전공) ;
  • 조영열 (제주대학교 원예환경전공)
  • Cha, Mi Kyung (Major in Plant Resources and Environment, Jeju National University) ;
  • Kim, Ju-Sung (Major in Plant Resources and Environment, Jeju National University) ;
  • Cho, Young Yeol (Major in Horticultural Science, Jeju National University)
  • 투고 : 2012.02.03
  • 심사 : 2012.11.01
  • 발행 : 2012.12.31

초록

박막수경 재배시스템을 갖춘 식물공장에서 적축면 상추의 생육, 엽수, 엽록소함량 및 생산 효율성에 관한 배양액 농도와 광도의 효과를 알아보기 위해 본 연구를 수행하였다. 배양액 농도 수준은 0.5, 1.0, 1.5, 2.0, 3.0, $6.0dS{\cdot}m^{-1}$, 광도 수준은 120, 150, $180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$이었다. 광주기는 16시간 명기, 8시간 암기 하에서 온도는 $20{\sim}25^{\circ}C$로 유지하였다. 재식거리는 $10{\times}10cm$였다. 배양액 농도 $0.5{\sim}1.5dS{\cdot}m^{-1}$ 수준에서 생육한 적축면 상추의 생체중과 건물중은 배양액 농도와 광도가 낮아짐에 따라 감소하였으나, 적색 정도는 광도와 농도별 차이가 없었다(실험 1). 적축면 상추가 배양액 농도 $1.5{\sim}6.0dS{\cdot}m^{-1}$ 수준에서 생육할 때, 생체중과 건물중 및 생산 효율성($g{\cdot}FW/kw$) 등은 배양액 농도 $3.0dS{\cdot}m^{-1}$$180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ 처리구에서 높았다(실험 2). 세부적인 실험 결과, 생체중, 건물중, 엽수 및 생산 효율성 등은 배양액 농도 $2.0dS{\cdot}m^{-1}$$180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ 처리구에서 가장 높았다(실험 3). 배양액 농도가 짙어질수록 SPAD 수치도 점진적으로 증가하였다. 이상의 결과에서 우리는 완전제어형 식물 공장에서 적축면 상추의 생산성 뿐만 아니라 생산 효율성을 고려해 볼 때, 적정 배양액 농도와 광도 수준은 각각 $2.0dS{\cdot}m^{-1}$$180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$였다.

To investigate the influence electrical conductivity (EC) of nutrient solution and light intensity on growth of red leafy lettuce, fresh and dry weights, number of leave, chlorophyll concentration and production efficiency were evaluated through nutrient film technique system. The levels of EC were 0.5, 1.0, 1.5, 2.0, 3.0, and $6.0dS{\cdot}m^{-1}$, and those of light intensity were 120, 150, and $180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$. Under photoperiod of 16 h/day, the temperature was maintained in the range of $20{\sim}25^{\circ}C$. Planting density was $10{\times}10cm$ (100 plants/$m^2$). When red leafy lettuce were grown in the EC range of $0.5{\sim}1.5dS{\cdot}m^{-1}$, the fresh and dry weights decreased as the EC levels and light intensity were lowered, however, Hunter's a value showed no significant differences among the treatments of EC and light intensity levels (Ex. 1). The fresh and dry weights and production efficiency ($g{\cdot}FW/kw$) were the highest in the treatment of $3.0dS{\cdot}m^{-1}$ and $180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ when crops were grown under the EC range of EC $1.5{\sim}6.0dS{\cdot}m^{-1}$ (Ex. 2). But the fresh and dry weights, number of leaves, and production efficiency of $2.0dS{\cdot}m^{-1}$ were the highest when the light intensity was $180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$ (Ex. 3). The SPAD value increased gradually as EC levels were elevated. From the above results, we concluded that optimum levels of EC and light intensity were $2.0dS{\cdot}m^{-1}$ and $180{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, respectively, for production as well as production efficiency of red leaf lettuce in plant factory.

키워드

참고문헌

  1. Barta, D.J. and T.W. Tibbitts. 1991. Calcium localization in lettuce leaves with and without tipburn: Comparison of controlled-environment and field-grown plants. J. Amer. Soc. Hort. Sci. 116:870-875.
  2. Choi, K.Y. and Y.B. Lee. 2001. Effect of electrical conductivity of nutrient solution on tipburn incidence of lettuce (Lactuca sativa L.) in a plant factory using an artificial light source. Hort. Environ. Biotech. 42: 53-56.
  3. Ikeda, A., Y. Tanimura, K. Ezaki, Y. Kawai, S. Nakayama, K. Iwao, and H. Kageyama. 1992. Environmental control and operation monitoring in a plant factory using artificial light. Acta Hort. 304:151-158.
  4. Kozai, T., A. Karion, K.G. Granto, and H.O. Ikeda. 1992. New greenhouse management. 117-120. Askura, Japan.
  5. Lee, J.G., S.S. Oh, S.H. Cha, Y.A. Jang, S.Y. Kim, Y.C. Um, and S.R. Cheong. 2010. Effects of red/blue light ratio and short-term light quality conversion on growth and anthocyanin contents of baby leaf lettuce. J. Bio- Env. Con. 19:351-359.
  6. Park, M.H. and Y.B. Lee. 1999a. Effects of light intensity and nutrient level on the growth and quality of leaf lettuce in a plant factory. J. Bio-Env. Con. 8:108-114.
  7. Park, M.H. and Y.B. Lee. 1999b. Effects of $CO_{2}$ concentration, light intensity and nutrient level on the growth of leaf lettuce in a plant factory. Hort. Environ. Biotech. 40:431-435.
  8. Shimizu, H., Y. Saito, H. Nakashima, J. Miyasaka, and K. Ohdoi. 2011. Light environment optimization for lettuce growth in plant factory. Proceedings of the 18th IFAC World Congress 18:605-609.
  9. Um, Y.C., S.S. Oh, J.G. Lee, S.Y. Kim, and Y.A. Jang. 2010. The development of container-type plant factory and growth of leafy vegetables as affected by different light sources. J. Bio-Env. Con. 19:333-342.
  10. Voipio, I. and J. Autio. 1995. Responses of red-leaved lettuce to light intensity, UV-A radiation and root zone temperature. Acta Hort. 399:183-187.
  11. Yoon, C.G. and H.K. Choi. 2011. A study on the various light source radiation conditions and use of LED illumination for plant factory. Journal of KIIEE 25(10): 14-22.