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http://dx.doi.org/10.12791/KSBEC.2021.30.4.335

Effect of Cooling in a Semi-closed Greenhouse at High Temperature on the Growth and Photosynthesis Characteristics in Paprika  

Kim, Eun Ji (Department of Horticultural Science, Graduate School of Mokpo National University)
Park, Kyoung Sub (Department of Horticultural Science, Mokpo National University)
Goo, Hei Woong (Department of Horticultural Science, Graduate School of Mokpo National University)
Park, Ga Eun (Department of Horticultural Science, Mokpo National University)
Myung, Dong Ju (SUNINUS Farming Corporation)
Jeon, Yong Hwan (SUNINUS Farming Corporation)
Na, Haeyeong (Department of Horticultural Science, Mokpo National University)
Publication Information
Journal of Bio-Environment Control / v.30, no.4, 2021 , pp. 335-341 More about this Journal
Abstract
In this study, experiments were conducted to investigate the effects of high- temperature stress on paprika in a semi-closed greenhouse where cooling is available and a normal plastic greenhouse. Paprika grown in a semi-closed greenhouse in which geothermal cooling is provided showed a significantly higher speed of photosynthesis than paprika grown in a 3-layer plastic greenhouse in which there is no cooling system. It suggests that the photosynthesis speed of paprika in a plastic house decreases owing to high temperature stress. Plant height increased by 13cm more in the semi-closed greenhouse, and the size of leaf showed similar growth speed until the 2nd week after transplanting, however, after 3 weeks, the semi-closed greenhouse showed a big difference by 47% compared with the plastic greenhouse. In terms of the fruit count, the semi-closed greenhouse had 10.6 fruits/plant and the plastic greenhouse had 4.6 fruits/plant, indicating that the semi-closed greenhouse had a higher number of fruits by 130% than the plastic greenhouse. The fruit weight also presented a difference between the semi-closed greenhouse and the plastic greenhouse by 46%, which is 566.7g/plant and 387g/plant, respectively. According to the above mentioned results, it was validated that when paprika is cultivated in a semi-closed greenhouse where a cooling system is applied, photosynthesis and growth were better than in the normal plastic greenhouse. Thus, if the hot summer season is overcome by applying the elemental technologies for the cooling system to the normal plastic greenhouse, farm income may increase through improvement in the yield and quality.
Keywords
cooling system; high temperature stressed; nutrient solution; plastic greenhouse; semi-closed greenhouse;
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