This study was conducted to identify the optimal root zone temperature for paprika cultivation, with an aim to increase the heating and cooling energy efficiency and prepare for extreme weather conditions. The greenhouse air temperature was maintained at 20oC and 25oC during the daytime (12 hours) and at 18oC during the nighttime (12 hours). The plant height did not show any significant differences between the treatment with air temperature and root zone temperature. The root length was highest under an air temperature of 25oC with root zone temperatures of 25oC and 30oC, and it was the lowest at 15oC. The leaf number was the highest when the root zone temperature was adjusted to 25oC and 30oC across all air temperatures. The leaf area increased with higher root zone temperatures, but considering the compactness of the seedlings, a root zone temperature of 25oC was found to be the most effective. The fresh and dry weight of the shoot increased with higher root zone temperatures at an air temperature of 25oC, while the fresh and dry weight of the roots tended to be higher when the root zone temperature was adjusted to 25oC and 30oC across all air temperatures. The compactness was most effective when the root zone temperature was adjusted to 20oC and 25oCC across all air temperatures. Based on the above results, adjusting the root zone temperature to 25oC at an air temperature of 25oC was found to be effective for the early growth of Paprika. The results of this study suggest that not only can growth be promoted through the regulation of root zone temperature, but it also contribute to the establishment of root zone temperature control technology, which can prevent an excessive drop and rise in the root zone temperature.

Plant growth and development strongly influenced by light quantity and its spectral composition. Young tomato plants were cultivated in growth cabinets under artificial light provided by red and blue light emitting diodes(LEDs) during 12 hours, then plants were exposed to monochromatic ultraviolet, blue, green and red lights as an end-of-day(EOD) treatment during 4 hours to study their effect on plant growth parameters. EOD lighting from various LEDs increased total fresh and dry weights as well as assimilation area compared to those in control. Blue light increased stem height, internode length and stem diameter. Monochromatic UV-A light reduced stem elongation, highly increased stomatal conductance. Compactness and health index of young tomato plants were increased in UV-A and red light treatments.

본 연구는 하천제방의 마루폭, 비탈경사, 축조재료와 다짐도의 변화에 따른 월류로 인한 제방붕괴특성을 수리모형실험을 통하여 분석하였다. 전반적으로 제방붕괴양상에 가장 영향을 주는 특성치는 다짐도, 축조재료, 마루폭, 비탈경사의 순으로 분석되었다. 제방붕괴로 인한 붕괴부의 세굴깊이 및 형태를 검토하였으며, 다짐도와 비탈경사 등의 영향이 큰 것으로 나타났다. 본 실험을 통하여 제방축조시의 충분한 다짐과 적절한 축조재료의 선택이 제방의 붕괴지속시간을 지연시키고