본 연구는 스탠다드 국화 ‘백마’ 품종의 단일처리기 간 중에 관수량과 급액농도에 따른 절화의 생육과 품 질에 미치는 영향을 알아보고자 실시하였다. 관수량은 -10, -20, -30, -40kPa의 수준으로, 급액농도는 EC 0.0, 0.8, 1.2, 1.6, 2.0, 2.4dS • m-1로 처리하였다. 관 수량을 -10kPa로 처리했을 때 절화장이 가장 길었으 며, 관수량량이 적을수록 절화장이 감소하였다. 절화무 게는 -10kPa 처리구에서 가장 무거웠으며, -40kPa 처 리구에서 가장 가벼운 것으로 나타났다. 첫 번째와 두 번째 상위엽의 면적은 모두 -10kPa 처리구에서 넓었 으며, 관수량이 적을수록 엽면적이 감소하였다. 꽃의 전체무게는 관수량 -10kPa에서 가장 무거웠으며, 관수 량이 적어질수록 감소하였다. 절화장은 EC 0.8dS • m-1 로 처리하였을 때 가장 길었고, EC가 높아질수록 짧 아지는 경향을 보여 주었다. 절화의 무게는 EC 0.8과 1.6dS • m-1 처리에서 74.1g과 75.2g으로 무거웠으며, 무처리구에서 가장 가벼웠다. 절화의 상위엽은 다른 처 리에 비해 EC 0.8dS • m-1 처리에서 첫 번째와 두 번 째 잎 모두 가장 넓었으며, 무처리구에서 가장 좁은 것으로 나타났다. 개화까지의 소요일수는 대조구에 비 해 EC 1.6과 2.4dS • m-1 처리에서는 각각 2일과 9일이 지연되었다. 꽃의 무게는 EC 0.8dS • m-1 처리에서 가장 무거웠으며, 대조구에서 가장 가벼운 것으로 나타났다.

Background : Cnidium officinale M. is a medicinal plant used a lot of herbal and functional food ingredients. Recently, the area of cultivation has been increased due to the increase in domestic demand. By the way, this plant is very vulnerable to high temperature, and recently it is difficult to cultivate due to abnormal high temperature and so on. Therefore, in this study, in order to effectively reduce the high temperature of the field, we investigated the degree of temperature reduction and the growth condition of the plant after installed mulching, irrigation and the fog facilities. Methods and Results : In order to reduce the temperature of C. officinale M. cultivation field, the black and white double vinyl mulching, drip irrigation and fog spray treatment were applied and the results were as follows. The survey was conducted at about 2:00 pm on a clear day in August, and the temperature was about 33℃ at the time of measurement. In the case of only black vinyl mulching without watering, the soil temperature was 43.5℃, the surface temperature was 61.4℃, and the mortality rate of the C. officinale M. was 98.0%. The temperature of soil and surface were lowered to 33.1℃ and 38.6℃, respectively, when treated with black vinyl mulching and drip irrigation and fog spraying. In the case of black and white double vinyl mulching, the effect of temperature reduction was better. The soil surface temperature of the non-irrigation treatment was 37.9℃, the surface temperature was 48.5℃ and the mortality rate was decreased to 6.7%. In case of combined drip irrigation and fog spraying, soil temperature was reduced to 31.5℃, surface temperature was 35.8℃, and mortality rate was 0%. Conclusion : As a result of this study, the temperature of soil and surface dropped by up to 12. 0℃ and 25.6℃, respectively, when combined with black and white double vinyl mulching and drip irrigation and fog spray treatment. The mortality rate declined from 89.0% to 0%. Therefore, Therefore, if the results of this study are applied to the cultivation of C. officinale M., it is expected that the production stability will be improved.

Background : Ginseng root rot caused by soil-borne pathogens, Cylindrocarpon destructans and Fusarium solani, is a major factors of replanting failure in ginseng cultivation. Some of the phenolic compounds detected in the soil of commercially cultivated American ginseng could inhibit the seed germination and seedling growth of American ginseng. Our study is to investigate the causes of replanting failure of ginseng by overhead flooding treatment and soil incorporation of ginseng fine root in soil infected with root rot pathogens. Methods and Results : To make soil occurring continuous cropping injury, 2-year-old ginseng infected with Cylindrocarpon destructans replanted in soil cultivated ginseng for 5 years. Treatment are as follows: 1) control, 2) water of 2ℓ was irrigate infected soil of 20ℓ, 3) ginseng fine root of 20g was mixed with infected soil of 20ℓ. Soil pH was increased, while other inorganic components were significantly reduced by overhead flooding treatment. Soil incorporation of ginseng fine root decreased soil pH, but increased EC, NO3, P2O5 and K, meanwhile, did not affected changes in organic matter, calcium, magnesium, sodium. Irrigation treatment in soil occurring replanted failure promoted distinctly above-ground growth of ginseng, and inhibited the occurrence of root rot because inorganic nutrient like NO3, P2O5 and K were decreased to optimal levels, and the density of soil pathogens could be reduced. Growth of ginseng was not inhibited, while root rot was promoted by soil incorporation of ginseng fine root. Conclusion : Irrigation treatment was effective in promoting the growth of ginseng and inhibited root rot distinctly. Ginseng fine root remaining in the soil after ginseng harvest did not affect the above-ground growth of ginseng, while promoted the occurrence of root rot.

This research performed cause of sedimentary, field maintenance practices, such as the physical characteristics of the sediments. And device was developed through research for treatment of accumulated sediment. This study proposed method of treatment of accumulated sediment in agricultural irrigation and drainage channel for underlying treatment of accumulated sediment and easy to maintain through an indoor pilot experiment and field performance test using development device.

Soybeans [Glycine max (L.) Merr.] are frequently exposed to unfavorable environments during growing seasons and water is the most important factor limiting for the production system. The purpose of this study was to determine the leaf water potential changes by irrigation, and to evaluate the relationships of leaf water potential, growth and yield in soybeans. Three soybean cultivars, Hwangkeumkong, Shinpaldalkong 2, and Pungsannamulkong, were planted in growth chamber and field with irrigated treatments. Leaf water potential of three soybean cultivars was positively correlated with leaf water content during vegetative and reproductive growth stages in growth chamber and field experiments. Leaf water potentials measured for three soybean cultivars under growth chamber were higher than those of under field conditions. Higher leaf water potential with irrigated plots under field was observed compared to conventional plots during reproductive growth stages. Leaf water potentials of three soybean cultivars were continually decreased during reproductive growth stages under field and there was no significant difference among them. Number of leaves, leaf water content, pod dry weight, number of seeds and seed dry weight with irrigated plots were higher than those of conventional plots. The results of this study suggested that leaf water potential could be used as an important growth indicator during the growing season of soybean plants.

작약 생육기간중 관수가 생육과 수량에 미치는 영향을 구명하고자 시험을 수행한 결과는 다음과 같다. 1 지상부 생육은 생육초기(5월1일∼6월12일)관수한 처리구가 경장 79.4cm, 경의 굵기 6.5cm로서 자연 강우나 대조구에 비해 각각 13.6∼7.4cm, 0.5mm씩 더 크거나 굵었다. 2. 지하부 생육은 생육 초기 관수가 근장 34.0cm, 근수 43.6개/주로서 자연 강우보다 각각 6cm, 5.5개/주 크거나 많았으며, 수량도 2,349kg/10a로서 자연 강우나 대조구에 비해 각각 13,8% 증수되었다. 3. 상품수량은 생육초기 관수가 2,045kg/10a로서 자연 강우의 1,708kg/10a, 대조구의 1,776kg/10a에 비해 각각 20, 15% 향상되었다.