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Research Article

Effects of Greenhouse Temperatures and Solar Irradiance Levels on the Monthly Production of Summer-Cultivated Paprika
Minkyung Kim1
,
Yong-Beom Lee1
,
Ki-Young Choi13*
1Department of Agriculture and Industries, Kangwon National University Graduate School, Chuncheon 24341, Korea
International Horticulture Institute, Seoul 02024, Korea
3Department of Smart Farm and Agricultural Industry, Kangwon National University, Chuncheon 24341, Korea
*Corresponding Author
30 June 2024. pp. 339-349
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Abstract

The production of summer-cultivated paprika from August to September in Korea is relatively low due to poor environmental conditions such as high temperatures starting from late June. For this reason, proper greenhouse environment management during the high-temperature period is crucial. This study aimed to analyze unfavorable environments for paprika in greenhouses during the high-temperature period that lead to low production on four commercial farms exporting paprika, two in Cheorwon-gun and two in Inje-gun, over a course of three years (2020‒2022). Monthly averaged 24 hour-mean temperature was at 21‒23°C (optimum temperature for paprika growth) from June to August in all surveyed farms. However, the maximum daytime temperature exceeded 27°C for 50‒60 days continuously and the maximum nighttime temperature was over 21°C.For the whole cultivation period, the greenhouse environment was divided into quartile groups: 45.5% with high-temperature (temp.) and high-integrated solar radiation (ISR) in the first quarter (Q1), 17.0% with low-temp. and high-ISR in Q2, 27.5% with low-temp. and low-ISR in Q3, and 10.0% with high-temp. and low-ISR in Q4. A period from 22 week to 24 week (mid-late July to early August) were mostly classified in Q4. Production was highest in June, decreasing from July to the lowest level in September. In September, production showed strong negative correlation with a number of hours exposed to higher temperature than 27°C. Although there was no significance between production and ISR, it likely implies that low solar radiation from mid-late July to early August resulted in even lower production in September.

Keywords
daytime temperature
imbalanced environment
low solar irradiance
nighttime temperature
number of hours exposed to high temperature
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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 : 42
  • No :3
  • Pages :339-349
  • Received Date : 2023-12-28
  • Revised Date : 2024-03-16
  • Accepted Date : 2024-04-01
  • DOI :https://doi.org/10.7235/HORT.20240025
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