This study aimed to determine the optimal planting density for sesame cultivation in a double cropping system after harvesting onion and garlic in the Muan region. It compared the growth, yield, disease susceptibility, and labor hours for two varieties of sesame (Landrace and Geonbaek sesame) at different planting densities. Plant height in the Landrace sesame showed no significant variation with different planting densities, whereas Geonbaek sesame increased in height with higher planting densities. Both cultivars increased the number of viable branches at lower densities. The stem diameter was thicker in Landrace sesame with decreasing planting density, while in the Geonbaek sesame, there was no significant difference in stem diameter regardless of planting density. The number of capsules per plant for the Landrace sesame increased with decreasing density, whereas Geonbaek sesame showed no significant difference. Yield for both cultivars was higher at greater densities. However, the late direct sowing time and shorter cultivation period significantly reduced the yield of sesame cultivated in a double cropping system compared to that of sesame grown in a single cropping system, due to the late direct sowing time and shorter cultivation period. There was no significant difference in disease occurrence based on planting density. Furthermore, although labor hours did not vary with planting density when comparing the labor hours required for cultivating the Landrace sesame and Geonbaek sesame, the latter needed less labor time. This study reveals the optimum planting distance and density for sesame cultivation as a double cropping after harvesting onion and garlic, providing invaluable data for establishing sesame double cropping cultivation techniques.

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.

Objectives of this study were to propose an optimal fertilization method of Chlorella and to evaluate its effects on growth of green pepper. Chlorella fusca strain was propagated and used in the experiment. As for treatment, drenching method (DM), foliar fertilization (FF), drench and foliar fertilization combination (DM + FF), and untreated control (CO) were used. Plant height of green pepper was higher in the CO treatment than in chlorella fertilized treatments. Chlorella fertilization inhibited stem growth of green pepper. Chlorophyll contents of green pepper leaves were higher in the DM + FF treatment. Yields were the higher in DM and DM + FF treatments than in other treatments. Vitamin C content was the highest in the DM + FF treatment. These results showed that Chlorella fertilization could increase the growth, yield, and bioactive substance content of green pepper. The Chlorella fertilization method could be applied to other crops. By applying this technology to the farmer, it is possible to increase income and supply healthy and safe high-quality agricultural products to consumers.

The purpose of this study was to investigate the effects of root zone temperatures (RZT) on the germination of bell peppers and tomatoes. Bell peppers and tomatoes had the highest germination rates (85% and 90%, respectively) at 25oC air temperature. Besides, the first germination of bell peppers was shifted by one day ahead. Bell peppers had the highest germination rate of 72,100, and 100%, respectively, when the RZT was adjusted to 30oC at airtemperature of 20, 25, and 30oC, and when the air temperature was adjusted to 35oC, the germination rate was the highest (70%) when the RZT was 15oC. Tomatoes had the highest germination rate at 20oC of the RZT at all atmospheric temperatures. A local cooling and heating system was established to improve the germination rate by controlling the RZT during the low and high temperature period. The optimum RZT for seedlings during the low and high temperature period was investigated.

본 연구는 근권부 냉방이 토마토 육묘 시 묘 생육에 미치는 영향을 구명하고자 수행되었다. 생장상 하부 파이프 냉방을 이용하여 근권부 온도를 20°C와 25°C로 설정하여 실험을 수 행하였다. 전 생육기간동안 초장, 근장, 엽수는 두 온도 처리구 간 차이를 보이지 않았다. 엽면적, 지상부와 지하부의 생체중 및 건물중, 엽록소 함량은 파종 28일 경과 시 25°C 처리구가 더 높았으며, 실험 종료 시 두 처리구 간 유의한 차이를 보이지 않았다. 이상의 결과로 근권부 온도 20°C와 25°C에서 토마토 생육 차이를 확인하지 못했다. 따라서, 본 연구는 고온기 토마 토 묘 생산 시 온실 냉방 효율을 높이기 위한 국부 냉방 기술 확 립에 도움을 줄 수 있을 것이다.