Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Development of a Light Extinction Coefficient Change Model according to the Growth Stage of Cucumber in a Greenhouse

온실 내 백다다기 오이의 생육단계에 따른 흡광계수 변화 모델 개발

  • Ki Beom Jeon (Department of Horticulture and Breeding, College of Life Science and Biotechnology, Andong National University) ;
  • Jong Hwa Shin (Department of Horticulture and Breeding, College of Life Science and Biotechnology, Andong National University)
  • 전기범 (국립안동대학교 대학원 원예육종학과) ;
  • 신종화 (국립안동대학교 생명과학대학 원예육종학과)
  • Received : 2022.12.30
  • Accepted : 2023.01.16
  • Published : 2023.01.31
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Abstract

Understanding the light environment in greenhouse cultivation and the light utilization characteristics of crops is important in the study of photosynthesis and transpiration. Also, as the plant grows, the form of light utilization changes. Therefore, this study aims to develop a light extinction coefficient model reflecting the plant growth. To measure the extinction coefficient, five pyranometers were installed vertically according to the height of the plant, and the light intensity by height was collected every second during the entire growing season. According to each growth stage in the early, middle, and late stages, the difference between the top and bottom light intensity tended to increase to 69%, 72%, and 81%. When leaf area index and plant height increased, the extinction coefficient decreased, and it showed an exponential decay relationship. Three-dimensional model reflecting the two growth indexes, the paraboloid had the lowest RMSE of 1.340 and the highest regression constant of 0.968. Through this study, it was possible to predict the more precise light extinction coefficient during the growing period of plants. Furthermore, it is judged that this can be utilized for predicting and analyzing photosynthesis and transpiration according to the plant height.

시설 내 작물이 이용하는 수광특성의 이해와 지속적으로 변화하는 광환경의 추적은 광합성과 증산반응 연구에서 중요하다. 또한 재배기간 동안 작물이 생장함에 따라 광이용 형태가 지속적으로 변화한다. 따라서 본 연구에서는 작물의 생육을 반영한 흡광계수 추정 모델을 개발하였다. 흡광계수의 측정을 위하여 작물의 높이에 따라 수직으로 일사량계를 5개 설치하였으며, 작물의 전 생육기간(1-85DAT) 동안 1초 단위로 측정을 하였다. 초기, 중기, 후기 각각의 생육단계에 따라 최상단 광량과 최하단의 광량의 차이가 69%, 72%, 81%로 증가하는 경향을 보였다. LAI와 초장이 증가함에 따라 흡광계수는 감소하였으며, 지수적 감소 관계를 보였다. 두 생육지표를 모두 반영한 3차원 모델에서는 Paraboloid 식이 평균 제곱근 오차(RMSE)가 1.340으로 가장 낮았고, 결정계수(R2)는 0.968로 가장 높았다. 본 연구를 통하여 작물 재배기간 동안 보다 정확한 흡광계수를 예측할 수 있게 되었고, 이는 작물의 높이에 따른 광합성 및 증산량 예측과 분석 연구에 활용될 수 있을 것으로 판단된다.

Keywords

Acknowledgement

본 연구는 한국스마트팜R&D재단(과제번호: 421001-03)의 지원에 의해 이루어진 것임.

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