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2025 Vol.43, Issue 4 Preview Page

Research Article

Estimation of the Amounts of Supplemental Carbon Dioxide (CO2) when Considering Night Respiration for a Hydroponics Tomato Greenhouse

토마토 수경 온실에서 야간 호흡량을 고려한 이산화탄소(CO2) 시비량 예측

Su-Hyun Choi14
,
Young-Hoe Woo2
,
Seo-A Yoon1
,
Dong-Cheol Jang34
,
Eun-Young Choi1*
최 수현14
,
우 영회2
,
윤 서아1
,
장 동철34
,
최 은영1*
1Department of Agriculture and Life Science, Korea National Open University, Seoul 03087, Korea
2Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries, Jeonju 54874, Korea
3Department of Interdisciplinary Program in Smart Agriculture, Kangwon National University, Chuncheon 24341, Korea
4Department of Horticulture, College of Agriculture and Life Science, Kangwon National University, Chuncheon 24341, Korea
1한국방송통신대학교 농학과
2국립한국농수산대학교 원예환경시스템학과
3강원대학교 스마트농업융합학과
4강원대학교 원예학과
*Corresponding Author
31 August 2025. pp. 515-527
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Abstract

This study aimed to estimate amount of carbon dioxide (CO2) supplementation necessary for tomato hydroponic cultivation by considering nighttime respiration using model-based equations. Experiment 1 was conducted in a commercial tomato hydroponic greenhouse during the spring growing season. Experiment 2 was conducted in an experimental greenhouse during the autumn growing season, with the predicted and measured CO2 increases due to plant respiration during the nighttime also compared. In experiment 1, the supply rate of CO2 fertilizer with LPG was a set to 600 µmol·mol-1 from 7:30 to 11:00 in a commercial tomato hydroponics greenhouse, and in experiment 2, CO2 was supplied at a set rate of 600 µmol·mol-1 from 9:00 to 11:00 using a liquefied CO2 generator in the experimental greenhouse. The estimation of the CO2 concentration prior to the first supplement of the day was calculated by adding the CO2 concentration about the time of sunset (lower than 50W solar radiation) on the last day to the integrated respiratory CO2 concentrations during the nighttime. In experiment 1, the estimated amount of CO2 supplement ranged from 3.24 to 36.9 g CO2·m-2·h-1 when the nighttime temperature was between 16 and 19°C, while in experiment 2, the estimated amount of CO2 supplement ranged from 4.21 to 52.6 g CO2·m-2·h-1 when the lowest nighttime temperature was 13°C. These results suggest that the night respiratory CO2 was affected by the night temperature of the greenhouse and therefore has an impact on the CO2 supplementation amount. Therefore, it suggests that the new model equation that introduces night respiration into the estimation of supplemental CO2 amounts can be used to precisely control greenhouse CO2 supplement.

Keywords
CO2 supplement
model-based equation
night temperature
photosynthesis rate
ventilation rate

본 연구는 선행연구에서 구축한 이산화탄소(CO2) 공급량 예측 모델식을 기반으로 야간 호흡을 고려한 CO2 공급량을 예측하기 위하여 실험 1에서는 봄 재배기간 동안 상업적 토마토 수경재배 온실에서, 실험 2는 가을 재배 기간 동안 실험 온실에서 실험을 수행하였고, 추가적으로 야간 시간대 식물 호흡 작용으로 인한 CO2 증가량 예측값과 실측값을 비교하였다. 실험 1은 상업용 토마토 재배 온실에서 LPG 연소형 이산화탄소 발생기를 이용하여 600µmol·mol-1을 목표 농도로 오전 7시30분부터 11시까지 수행하였으며 실험 2는 실험온실에서 수행하였으며 CO2 공급은 액화탄산발생기를 이용하여 600µmol·mol-1을 목표 농도로 설정하여 오전 9시부터 11시까지 실시하였다. 하루의 첫 CO2 공급 시작 시점의 예측 CO2 농도(PV Ci)는 전날 일몰 시점(광량 50W 이하)의 CO2 농도(C(lt))에 야간 호흡량을 합하여 계산하였다. 실험 1에서 토마토 온실 야간 기온이 16–19°C 범위였던 3월 24–26일의 3일간 예측된 CO2 시비량은 3.24–36.9g CO2·m-2·h-1범위였고, 실험 2에서 토마토 온실 야간 기온이 최저 13°C까지 내려간 조건이였던 10월 16–18일의 3일간 예측된 CO2는 4.21–52.6g CO2·m-2·h-1범위였다. 온실의 최저 야간 기온이 호흡량에 영향을 미치고 그에 따라 CO2 시비량이 달라지는 것을 알 수 있다. 따라서, 기존 CO2 공급량 예측 모델식에 야간 호흡이 도입된 새로운 모델식은 온실 CO2 공급량을 정밀하게 예측하여 조절하는데 활용될 수 있을 것으로 보인다.

키워드
CO2 공급
모델식
야간온도
광합성율
환기율
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Information
  • Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
  • Publisher(Ko) :한국원예학회
  • Journal Title :Horticultural Science and Technology
  • Journal Title(Ko) :원예과학기술지
  • Volume : 43
  • No :4
  • Pages :515-527
  • Received Date : 2024-07-30
  • Revised Date : 2024-09-25
  • Accepted Date : 2024-10-11
  • DOI :https://doi.org/10.7235/HORT.20250020
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