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This study was carried out to clarify the effect of CHO-CO and PO film on air temperature in greenhouse and Korean melon fruit characteristics and yield. On January 8 in 2017, the maximum, minimum and average air temperature in greenhouse covered with CHO-CO film were 38.9C, 13.4C and 20.1C, respectively. At the same date, the maximum, minimum and average air temperature in greenhouse covered with PO film were 40.0C, 14.9C and 20.3C, respectively. On August 7 in 2017, the maximum, minimum and average air temperature in greenhouse covered with CHO-CO film were 47.2C, 23.1C and 32.4C, respectively, and the maximum, minimum and average air temperature in greenhouse covered with PO film were 50.3C, 23.6C and 34.0C, respectively. The results of investigation of qualities and yields of Korean melons from May 26 to August 15 in 2017 were as follows. The fruit weight of Korean melon harvested in CHO-CO film’s greenhouse was 371.6g which was 22.2g less than that of PO film greenhouse. The sugar contents of Korean melon harvested in CHO-CO film greenhouse was 14.5brix which was 1.4brix greater than that of the fruits harvested in PO film greenhouse. The chromaticity (a-value) of fruit skin of Korean melon harvested in CHO-CO film greenhouse was 12.3 which was 1.5 greater than that of the fruits harvested in PO film greenhouse. The marketable yield rate of Korean melon harvested in CHO-CO film’s greenhouse was 89.4% which was 8.0% higher than the fruits harvested in PO film greenhouse. The yield of Korean melon harvested in CHOCO film’s greenhouse was 2694kg per 10 a which was 26% more than that harvested in PO film greenhouse. In conclusion, the CHO-CO film could be effective to produce Korean melon in high temperature season. Additional key words : fruit weight, haze, soluble solids, temperature decreasing, yield.

Changes in Air Temperature of Plastic House as Affected by Light Control Film and Their Impacts on Korean Melon Yield