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2025 Vol.34, Issue 1 Preview Page

Original Articles

Effects of Relative Humidity and Light Intensity Levels on Irrigation amount, and Growth, Sap Flow, and Gas Exchange Characteristics of Cucumbers Grown in Soil Pots

토양 포트 재배에서 공중 습도와 광 조건이 관수와 오이의 생육, 줄기 수액 흐름 및 가스교환 특성에 미치는 영향

Minkyung Kim1
,
Jin Hee An2
,
Yong Beom Lee3
,
Ki-Young Choi14*
김 민경1
,
안 진희2
,
이 용범3
,
최 기영14*
1Graduate Student, Department of Agriculture and Industries, Kangwon National University Graduate School, Chuncheon 24341, Korea
2Post-doctor researcher, Soil and Fertilizer Management Division, National Institute of Agricultural Science, RDA, Wanju 55365 Korea
3President, International Horticulture Institute, Seoul 02024, Korea
4Professor, Department of Smartfarm and Agricultural Industry, Kangwon National University, Chuncheon 24341, Korea
1강원대학교 대학원 농산업학과 대학원생
2국립농업과학원 토양비료과 박사후연구원
3국제원예연구원 원장
4강원대학교 스마트팜농산업학과 교수
*Corresponding Author
31 January 2025. pp. 98-107
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Abstract

This study evaluated the effects of relative humidity (RH) and light intensity on irrigation amount, growth, sap flow relative rate (SFRR), gas exchange, and water use efficiency (WUE) in cucumber ‘AsiaUnChun F1’ over 54 days. Plants were grown in soil pots irrigated with a nutrient solution (EC 1.5 dS m-1) and managed with a tensiometer at -10 kPa soil water tension. Supply per time of the nutrient solution was 265mL per plant. Three treatments were applied to 200 µmol·m-2·s-1 PPFD with daytime humidification (HL), and without humification (Control), and 350 µmol·mm-2·s-1 PPFD with daytime humidification (HH). The average daytime RH of humification treatments was 79.5% (VPD 2.4 kPa) while that of no humification was 65.5% (VPD 4.0 kPa). Temperature settled was 25°C for all treatments. Total number of irrigations was 29, 26, and 27 for Control, HL, and HH, respectively. HH plants exhibited superior growth in plant height, node number, and leaf sizes, with higher photosynthetic rates. Higher transpiration rate was observed in Control. Daytime leaf temperatures were 28°C (HH), 26°C (HL), and 23°C (Control), creating leaf-air temperature differences of 2°C (HH), 0°C (HL), and -3°C (Control). Sap flow relative rate (SFRR) in all treatments increased from 10－30% to 60－90% before and after photoperiod onset. SFRR was also affected by soil water tension, with a 20－30% increase after irrigation in all treatments. During photoperiod, average SFRR for Control was 88.5% which was higher than for the treatments with humidification. These findings showed that in cucumber soil pot cultivation, when an adequate VPD was maintained, cucumber growth and female flower incidence rate were high, and leaf-air temperature differences and irrigation during the photoperiod affected SFRR, despite no difference in soil water tension between the treatments.

Keywords
humidification
leaf-air temperature differences
soil water tension
transpiration rates
VPD

본 연구는 54일 동안 관수량과 오이(‘아시아 은천 F1’)의 생육, 줄기 수액 흐름, 광합성 특성, 수분 이용 효율에 대한 상대 습도(RH)와 광도의 영향을 평가하였다. 오이는 토양 화분에서 재배되었으며, 토양 수분 장력계로 자동 제어(－10kPa) 하여 EC 1.5dS m-1의 양액을 1회 주당(per plant) 265mL 공급하였다. 처리는 세 조건으로 광도 200µmol·m-2·s-1에 가습 처리구(HL)와 무가습의 대조구(Control), 광도 350µmol·m-2·s-1에 가습 처리구(HH)로 설정하였다. 주간(weekly) 평균 RH는 가습 처리구에서 79.5%(VPD 2.4kPa), 무가습 처리구에서 65.5%(VPD 4.0kPa)이었고, 평균 온도는 모든 처리구에서 25℃이었다. 총관수 횟수는 대조구에서 29회, HL처리구에서 26회, HH처리구에서 27회이었다. HH처리구에서 초장과 마디 수, 엽 생육, 줄기 직경에서 생장이 컸으며, HH처리구에서 광합성률이 더 높았고, 대조구에서 증산률이 더 높았다. 주간 엽온은 HH처리구에서 28℃, HL처리구에서 26℃, 대조구가 23℃였으며, 엽기온차는 HH처리구에서 2℃, HL처리구에서 0℃, 대조구에서 －3℃ 이였다. 모든 처리구에서 줄기 수액흐름(SFRR)은 광의 유무와 토양수분장력에 영향을 받아 광주기 시작 전 10%(HH, Control)－30%(HL)에서 광주기 시작 이후 60%(HH)－90%(Control)로 상승하였고, 관수 후 SFRR은 20－30% 상승폭을 나타냈다. 광 조사 동안 평균 SFRR은 대조구에서 88.5%로 가습처리구보다 높은 경향이었다. 이상의 결과 오이 토양 포트재배에서 토양수분장력 －10kPa 관수제어시 처리구의 토양 수분장력은 차이가 없음에도 불구하고 적정 VPD가 유지되면 오이의 생육과 암꽃발생률이 높았고 광주기 동안 엽기온차, 관수영향은 SFRR에 영향을 주었다.

키워드
가습
수증기압포차(VPD)
엽기온차
증산률
토양 수분 장력
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Information
  • Publisher :The Korean Society for Bio-Environment Control
  • Publisher(Ko) :(사)한국생물환경조절학회
  • Journal Title :Journal of Bio-Environment Control
  • Journal Title(Ko) :생물환경조절학회지
  • Volume : 34
  • No :1
  • Pages :98-107
  • Received Date : 2024-12-12
  • Revised Date : 2025-01-24
  • Accepted Date : 2025-02-01
  • DOI :https://doi.org/10.12791/KSBEC.2025.34.1.098
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