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http://dx.doi.org/10.12791/KSBEC.2020.29.3.306

The Effect of Greenhouse Climate Change by Temporary Shading at Summer on Photo Respiration, Leaf Temperature and Growth of Cucumber  

Kim, Dong Eok (Department of General Education, Korea National College of Agriculture and Fisheries)
Kwon, Jin Kyung (Energy and environmental engineering division, National institute of Agricultural Science, RDA)
Hong, Soon Jung (Department of General Education, Korea National College of Agriculture and Fisheries)
Lee, Jong Won (Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries)
Woo, Young Hoe (Department of Horticulture Environment System, Korea National College of Agriculture and Fisheries)
Publication Information
Journal of Bio-Environment Control / v.29, no.3, 2020 , pp. 306-312 More about this Journal
Abstract
This study was conducted to investigate cucumber plants response to greenhouse environments by solar shading in greenhouse in the summer. In order to estimate heat stress reduction of cucumber plants by solar shading in greenhouse, we measured and analyzed physiological conditions of cucumber plants, such as leaf temperature, leaf-air temperature, rubisco maximum carboxylation rate, maximum electron transport rate, thermal breakdown, light leaf respiration, etc. Shading levels were 90% mobile shading of full sunlight, 40% mobile shading of full sunlight and no shading(full sunlight). The 90% shading screen was operated when the external solar radiation is greater than 650 W·m-2. Air temperature, solar radiation, leaf temperature, leaf-air temperature and light leaf respiration in the 90% shading of full sunlight was lower than those of 40% shading and no shading. Rubisco maximum carboxylation rate, arrhenius function value and light leaf respiration of the 90% shading were significantly lower than those of 40% shading and no shading. The thermal breakdown, high temperature inhibition, of 90% shading was significantly higher than that of 40% shading and no shading. Therefore, these results suggest that 90% mobile shading made a less stressful growth environment for cucumber crops.
Keywords
greenhouse; leaf temperature; light leaf respiration; shading; thermal breakdown;
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