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

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 $38.9^{\circ}C$, $13.4^{\circ}C$ and $20.1^{\circ}C$, respectively. At the same date, the maximum, minimum and average air temperature in greenhouse covered with PO film were $40.0^{\circ}C$, $14.9^{\circ}C$ and $20.3^{\circ}C$, respectively. On August 7 in 2017, the maximum, minimum and average air temperature in greenhouse covered with CHO-CO film were $47.2^{\circ}C$, $23.1^{\circ}C$ and $32.4^{\circ}C$, respectively, and the maximum, minimum and average air temperature in greenhouse covered with PO film were $50.3^{\circ}C$, $23.6^{\circ}C$ and $34.0^{\circ}C$, 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 $14.5^{\circ}brix$ which was $1.4^{\circ}brix$ 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 CHO-CO 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.

조광필름을 피복한 시설 내 기온변화와 참외의 수량

이 연구는 CHO-CO와 PO필름이 시설 내 기온과 참외의 특성, 수량에 미치는 영향을 구명하고자 수행되었다. 2017년 1월 8일 기온의 일변화 조사에서 조광필름 처리구의 최고, 최저 및 평균 기온은 각각 $38.9^{\circ}C$, $13.4^{\circ}C$, $20.1^{\circ}C$ 이었고, PO필름 처리구에서 각각 $40.0^{\circ}C$, $14.9^{\circ}C$, $20.3^{\circ}C$로 처리 간 차이가 거의 없었고, 2월부터 5월까지 과실특성, 품질 및 수량 조사에서도 처리 간 차이가 없었다. 그러나 고온기인 8월 7일부터 1일간 기온의 일변화에서 조광필름 처리구의 최고, 최저 및 평균 기온은 각각 $47.2^{\circ}C$, $23.1^{\circ}C$, $32.4^{\circ}C$ 이었고, PO필름 처리구에서도 각각 $50.3^{\circ}C$, $23.6^{\circ}C$, $34.0^{\circ}C$로 조광필름 처리구에서 최고 및 평균기온이 각각 $3.1^{\circ}C$, $1.6^{\circ}C$ 더 낮았다. 특히 주간의 기온만 비교해 보면 저온기에는 차이가 거의 없지만 고온기에는 PO필름에 비해 조광필름 처리구에서 $3.0^{\circ}C$까지 기온이 낮아지는 것을 알 수 있었다. 2017년 5월 26일부터 8월 15일까지의 고온기의 품질 및 수량 조사에서도 PO필름 처리구에 비해 조광필름 처리구에서 과중이 371.6g으로 22.2g 더 가볍고, 태좌부의 당도는 $14.5^{\circ}brix$로 $1.4^{\circ}brix$ 더 높고, 과피의 색도(a값)도 12.3으로 1.5 더 높고, 상품과율도 89.4%로 8.0%P 증가하였고 10a당 상품수량도 2,694kg으로 26% 증가하였다. 결론적으로 고온기에 조광필름은 참외 생산에 효과적으로 이용될 수 있을 것이다.