초록
고온기 시설딸기 재배시 저비용 고효율의 냉방기술을 개발하기 위하여 차광도포제 이용효과를 구명하고자 수행하였다. 차광에 따른 일사량($W/m^2$)을 조사한 결과 무차광에 비해서는 차광 15% 도포구는 14~17%, 차광 35% 도포구는 33~37%, 흑색차광망은 39~44% 감소하였다. 그리고 투광비율은 맑은 날에 비해서 비오는 날 차광 15%, 35%도포구에서 조금 높아지는 경향이었다. 차광처리에 의한 시설내부 온도는 차광 15% 도포구는 $38.4^{\circ}C$, 차광 35% 도포구 $36.5^{\circ}C$이었는데 흑색차광막은 $35.1^{\circ}C$이었다. 흑색차광망에 비해서 차광 15% 35% 도포구는 각각 $3.3^{\circ}C$, $1.9^{\circ}C$더 높았다. 차광처리에 딸기의 관부직경은 흑색차광막이 7.5mm, 차광 35% 도포구 8.6mm, 차광 15% 도포구 8.3mm로 조사되었다. 딸기의 지상부 생체중은 차광 35% 도포구 7.8g, 차광 15% 도포구 6.7g, 흑색차광막이 5.8g이었다. 그리고 지하부 생체중은 차광 35% 도포구 4.3g, 차광 15% 도포구 4.1g, 흑색 차광막이 2.7g으로 차광 35% 도포구에서 가장 무거웠다.
This study was carried out to evaluate the efficiency of white shading agent for reduction of greenhouse air temperature and to develop cost-effective cooling strategies for strawberry seedling production during hot seasons. Experiment results showed that solar radiation ($W/m^2$) was reduced by 14~17% and 33~37% for 15% and 35% white wash shading treatments, respectively, in black shading net treatment solar radiation was reduced by 39~44% compared to non-shaded treatment. Measured greenhouse air temperatures in 15% and 35% white wash shading treatments were $38.4^{\circ}C$ and $36.5^{\circ}C$, respectively, whereas in black shading net covered greenhouses air temperature was $35.1^{\circ}C$, thereby 35% and 15% shading treatments showed 3.3 and $1.9^{\circ}C$ higher air temperatures than black net shading treatment. Crown diameter of strawberry plants in black net shading treatment was 7.5mm, and in 15% and 35% white wash shading treatments were 8.6mm and 8.3mm, respectively. Strawberry transplants grown in 35% white wash shading treatment produced the highest above ground fresh weight(7.8g), followed by 15% white wash shading(6.7g) and black net shading treatments(5.8g). Also, both 15% and 35% white wash shading treatments produced higher root fresh weight(4.1g and 4.3g) compare to black net shading treatments(2.7g).
