Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Evaluating Cultivation Environment and Rice Productivity under Different Types of Agrivoltaics

유형이 다른 영농형 태양광발전시설 하부 재배 환경 및 벼 생산성 평가

  • Ban, Ho-Young (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Jeong, Jae-Hyeok (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Hwang, Woon-Ha (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Lee, Hyeon-Seok (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Yang, Seo-Yeong (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Choi, Myoung-Goo (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion) ;
  • Lee, Chung-Keun (Division of Crop Physiology and Production, National Institute of Crop Science, Rural Development Administrarion)
  • 반호영 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 정재혁 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 황운하 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이현석 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 양서영 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 최명구 (농촌진흥청 국립식량과학원 작물재배생리과) ;
  • 이충근 (농촌진흥청 국립식량과학원 작물재배생리과)
  • Received : 2020.06.24
  • Accepted : 2020.08.24
  • Published : 2020.12.30
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Abstract

The agrivoltaic can produce electricity and grow crops on fields at the same time. It is necessary to analyze the cultivation environment and evaluate the crop productivity under agrivoltaic because the shading point changes according to structure of agrivoltaic and sun's position. Two types of "fixing" and "tracing" agrivoltaic were installed, and a rice cultivation experiment was conducted in the fields under each agrivoltaic and without shading (control). "Hyunpoombyeo" was transplanted on June 7, 2019, and grown with fertilization of 9.0-4.5-5.7 kg/10a (N-P-K). Fifteen weather stations were installed under each agrivoltaic to measure solar radiation and temperature, and yield and yield-related elements were investigated by points. The accumulated solar radiation during the rice growing season in fixing was no much difference between points, and that in tracing was much difference between points. However, the average solar radiations of two agrivoltaics were similar. The mean temperature, yield, and yield-related elements showed a significant difference for the shading rate, and decreased with increasing the shading rate except ripening grain rate and 1000 grain weight of fixing agrivoltaic. In the relationship between shading rate and yield, fixing and tracing were fitted to a logistic equation and a simple linear equation, respectively, and showed a high correlation (tracing: R2 = 0.62, fixing: R2 = 0.73). The shading rate variation by point for two types was large despite similar yield variation. Thus, it needs to be more closely examined the relationship of the shading rate for a specific period rather than the shading rate during the whole growing season.

영농형 태양광발전시설은 농지에 설치하여 전기도 생산하면서 동시에 작물도 재배할 수 있다. 영농형 태양광발전시설의 구조와 태양의 위치에 따라 차광 지점이 변화하기 때문에 시설 하부 환경을 분석할 필요가 있으며, 작물생산성도 평가되어야 한다. 영농형 태양광발전시설은 "고정형"과 "추적형" 두가지 유형을 설치하였으며, 시설을 설치한 농지와 차광이 되지 않는 일반 농지(control)에 벼 재배 실험을 실시하였다. 현품벼를 2019년 6월 7일에 기계 이앙하였으며, 시비량은 N-P-K= 9.0-4.5-5.7 kg/10a 이었다. 각 태양광발전시설 하부 15개 지점에 일사와 온도 센서를 설치하여 기상을 측정하였고, 지점 별로 수량 및 수량관련요소들을 조사하였다. 벼 생육기간동안 누적 일사는 고정형의 경우 지점들 간 차이가 크지 않았으며, 추적형의 경우 지점들 간 차이가 크게 나타났지만, 두 유형의 평균 누적 일사량은 비슷하였다. 고정형의 등숙률과 천립중을 제외하고 평균 기온과 수량 및 수량 관련 요소들 모두 차광율에 대해 유의한 차이를 나타냈으며 차광율이 커질수록 감소하였다. 차광율과 수량과의 관계에서 고정형은 로지스틱식으로 추적형은 1차방정식으로 각기 다르게 나타났으며, 두 유형 모두 높은 상관을 보였다(추적형: R2 = 0.62, 고정형: R2 = 0.73). 두유형의 지점 별 차광율 변동은 두 유형 간 비슷한 수량 변동에도 불구하고 크게 나타났다. 따라서, 전체 생육 기간의 누적 일사에 대한 차광율보다는 특정 시기의 차광율과의 관계를 좀 더 세밀히 검토할 필요가 있다.

Keywords

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