Journal of Bio-Environment Control (생물환경조절학회지)

The Korean Society for Bio-Environment Control (한국생물환경조절학회)
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Effect of Irrigation Starting Point of Soil on Chlorophyll Fluorescence, Stem Sap Flux Relative Rate and Leaf Temperature of Cucumber in Greenhouse

시설 토양 오이재배에서 관수개시점 처리가 광합성 형광반응, 줄기수액흐름 및 엽온에 미치는 영향

  • An, Jin Hee (Department of Agriculture and Industries, Kangwon National University Graduate School) ;
  • Jeon, Sang Ho (Soil and Fertilizer Management Division, National Institute of Agricultural Science, RDA) ;
  • Choi, Eun Yong (Department of Agricultural Science, Korea National Open University) ;
  • Kang, Ho Min (Department of Horitculture, Kangwon National University) ;
  • Na, Jong Kuk (Division of Future Agriculture Convergence, Kangwon National University) ;
  • Choi, Ki Young (Division of Future Agriculture Convergence, Kangwon National University)
  • 안진희 (강원대학교 농산업학과 대학원) ;
  • 전상호 (국립농업과학원 토양 비료과) ;
  • 최은영 (한국방송통신대학교 농학과) ;
  • 강호민 (강원대학교 원예학과) ;
  • 나종국 (강원대학교 미래농업융합학부) ;
  • 최기영 (강원대학교 미래농업융합학부)
  • Received : 2021.01.11
  • Accepted : 2021.01.19
  • Published : 2021.01.31
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Abstract

This experiment was conducted to investigate the effect on chlorophyll fluorescence, stem sap flux relative rate (SFRR) and leaf temperature of cucumber when irrigation is controlled using a soil moisture tensiometer. Cucumber (Cucumis sativus L.) 'Chungchun' was irrigated of 10-10-20 kPa and 20-10-10 kPa by soil starting point of irrigation at each growth stage. At the 66 days after treatment (DAT) of 736 to 854 W·m-2 and above 32℃, chlorophyll fluorescence variables (Fo, Fm, Fv/Fm) values showed significantly different between treatments. The Fo and Fv/Fm value in the daytime (10:30 am to 6:00 pm) at 66 DAT was higher in 20-10-10 kPa treatment than in 10-10-20 kPa treatment. The Fv/Fm value decreased when the leaf temperature was increased. There was no difference in leaf growth (length, width and area) at 28 and 66 DAT, but the chlorophyll content (SPAD value) was significantly higher in 20-10-10kPa treatment. SFRR and leaf temperature increased with light intensity and temperature increased. In both treatments, the SFRR started to increase sharply between 8 am and 9 am when the solar radiation is 170 W·m-2 or higher. The soil temperature of the treatments decreased after irrigation, that showed 31.0℃ at 10-10-20kPa and 28.5℃ at 20-10-10kPa on July 5 (820W·m-2 at 1 pm). However, there was no difference in SFRR, leaf temperature, temperature difference (leaf temperature - air temperature) and VPD between treatments. SFRR was significantly positive correlate with the leaf temperature (p < 0.01, r = 0.770). The SFRR and leaf temperature showed positive significant correlation with solar radiation, temperature, soil temperature, soil moisture content and VPD. There was a negative significant correlation with relative humidity and temperature difference.

시설 토양 오이재배에서 토양수분장력계를 이용하여 관수 제어하였을 때 오이의 광합성 형광반응, 수액 흐름, 엽온 등에 미치는 영향을 구명하고자 실험을 수행하였다. 오이(Cucumis sativus L.)'청춘'(해오름 종묘)을 공시하여 관수개시점 10-10-20kPa 또는 20-10-10kPa의 2처리하였다. 766 ~ 854 W·m-2의 고광, 32℃ 이상의 고온인 처리 66일 째 광합성형광반응변수(Fo, Fm, Fv/Fm)값은 처리 간 차이가 컸다. 66일 째 낮 시간(오전 10시 반 ~ 오후 6시)의 Fo와 Fv/Fm값은 10-10-20kPa 처리보다 20-10-10kPa 처리에서 높았다. 엽온이 높았을 때 Fv/Fm값은 감소하였다. 28일과 66일째 엽 생육(엽장, 엽폭, 엽면적)은 차이가 없었으나 엽록소 함량(SPAD 값)은 20-10-10kPa 처리에서 유의하게 높았다. 광도와 온도가 증가함에 따라 줄기수액흐름상대율(SFRR)과 엽온은 상승하였다. 두 처리구 모두SFRR은 광도 170 W·m-2 이상인 오전 8시 ~ 9시간대에 급격한 증가가 시작되었다. 관수 후의 처리구 토양 온도는 감소하였으나, 7월 5일(광도 820W·m-2, 오후 1시) 토양 온도가 10-10-20kPa에서는 31.0℃, 20-10-10kPa에서는 28.5℃였다. 그러나 처리 간 SFRR, 엽온, 기온차, VPD는 차이가 없었다. SFRR과 엽온 간에는 정의 상관성(p < 0.01, r = 0.770)을 보였으며, SFRR과 엽온은 광, 온도, 토양 온도, 토양수분함량, VPD 간에는 정의 상관을 상대습도와 기온차 간에는 부의 상관을 보였다.

Keywords

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