• 한국토양비료학회지
• /
• 제46권6호
• /
• pp.458-462
• /
• 2013

A drainage ditch is normally a component of drainage networks in farming systems to remove surplus water, but at the same time, it may act as a major conduit of agricultural nonpoint source pollutions such as sediment, nitrogen, phosphorus, and so on. The hybrid turbidity reduction system using biodegradable check dam and synthetic polymer was developed in this study to manage pollutant discharge from agricultural farmlands during rainfall events and/or irrigation periods. The performance of this hybrid system was assessed using a laboratory open channel sized in 10m-length and 0.2m-width. Various check dams using agricultural byproducts (e.g., rice straw, rice husks, coconut fiber and a mixture of rice husks and coconut fiber) were tested and additional physical factors (e.g., channel slope, flowrate, PAM dosage, turbidity level, etc.) affecting on turbidity reduction were applied to assess their performance. A series of lab experiments clearly showed that the hybrid turbidity reduction system could play a significant role as a supplementary of Best Management Practice (BMP). Moreover, the findings of this study could facilitate to develop an advanced BMP for minimizing nonpoint source pollution from agricultural farmlands and ultimately to achieve the sustainable agriculture.

• Journal of Ginseng Research
• /
• 제20권4호
• /
• pp.472-500
• /
• 1996

Researches on mineral nutrition, physiology and phyrsiological diseases, . cultivaction methods. brceding. pest control quality management and extension during 1976-1995 in Korea were reviewed Review in brceding and pest control was restricted to the researches directely related to cultivaction. Mineral nulrient up take. partion and varicos factors such as top dreasing. Light intersity etc. and interrelationship between minerals were investigated. Top dressing was not effective due to low minera1 requorement Physiological characteristics on tempelature light and water were well elucidated and applied to assess traditional cultivation method and its inovation. Photosyrnthetic pigments. light harvest proteins and activity of related enzymes were studied. In nitrogen metabolism arginine, praline, ammonium, threonine appeared to have important role in re growth of shoot Saponin metabolism was studied in relation to growth and new ginsenosides were found but physiological role of saponin was not clearly elucidated yet Endogenous growth regulators were reported and various erogenous growth regulators were studied for growth stimulation. short stem and seed pruning etc. Various physiological diseases were investigated for cause and control measures were established. Water culture was little studied Forest culture was studied but not retched the recommendable stage Drip irrigation straw mulching. seasonal shading and soil preparation method including soil fertility adjustment were established for practical application. Shading materials completely changed to polyethylene net and materials of polymers The research on ginseng cultivation in paddy field opened the way to establish the permanent ginseng cultivation plantation Ginseng harvester and seeder were developed in the late 1950s. Transplanted and many other machines were developed in the early 1990s. In ginseng breeding only pure line selection was of practical significance several verities were at the stage of seed propagation at ginseng plantations. Mutation breeding (${\gamma}$-ray. X-ray chemicals) was not successful. The research on plantlet formation through tissue culture was a little progressed but still far behind to vegetative propagation. Disease control research was concentrated in the isolation and identification of pathogans. their ecological charactelistics and biological control and soil humigation. Potato root rot nematodes was found and control method was established. Insect and small animal control research was greatly progresses in identification, ecological investigation, and ecological and physical control. Weed control was less important due to the development of mulching method of ridge and ditch. Quality factors of raw ginseng in relation to red ginseng process were extensively studied. Traditional quality measures were elucidated in accordance with modern analytical chemistry resulting in the importance of peptides in the centrat part rather than ginsenosides For large root production growth promoting rootzone micrcorganisms (PGPRM) were isolated and active compounds were identified. Field test on PGPRM was on going. Varictus methods formality improvement through cultivation were developed. Management research of ginseng production was rare Extension was active throuch official and private organizations and through workshop for the extension specialists, and direct lectures to grower's. Extension services made the researcher to understand the existing problems at grower's fields. Research environment for ginseng production was in prime time only for three years when Korea Ginseng Research Institute was established then gradually aggravated.

• 환경생물
• /
• 제27권1호
• /
• pp.31-39
• /
• 2009

농업생태계의 환경별로 깔따구류의 분포를 밝히고 우점종을 이용한 유기물 분해능을 평가하고자 대단위경작지, 친환경농업지, 생활하수 유입지, 축산폐수 유입지 및 주변수로 등의 5개 서식처별로 나누어 '04$\sim$'06년까지 각 구획을 대표하는 총 78개 지점에서 깔따구과 및 공서 무척추동물을 정량 채집하였다. 그 결과, 농업지대의 깔따구류는 총 16종으로 동정되었다. 서식지 유형별로 출현한 종수를 보면, 축산폐수 유입지에서 11종, 대단위 농경지는 8종, 농경지 주변수로는 7종, 친환경농업지는 6종, 생활하수 유입지는 2종으로 조사되었다 구획별로 나타난 우점종을 보면, 유기물의 농도가 높은 대단위경작지(A), 생활하수 유입지(C) 및 축산폐수 유입지(D)에서는 닙폰깔따구(C. nipponensis), 유기물 함량이 낮은 주변수로(E)에서는 숲아기깔따구(C. sylvestris), 친환경농업지(B)에서는 서산장부깔따구(Tanytarsus sesanensis)였다. 수질과 군집지수는 논주변의 수로에서 높았고, 대단위 경작지, 친환경농업지, 생활하수 유입지, 축산폐수 유입지는 낮은 수준으로 조사되었다. 저질내에서 닙폰깔따구의 유기물 제거능력은 무처리구와 대비하여 90개체 처리구에서 18% 증가하였다.