• Journal of Ginseng Research
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• 제6권1호
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• pp.46-55
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• 1982

The effect of soil fumigation on the growth, yield, root-rot and red discoloration of 2 year-old ginseng, Panax ginseng C. A. Meyer was investigated in the ginseng replanted fie14 Six soil fumigants, Cylone, Basamid, D-D, Dowfume MC-2, Telone C-17, and Vapam were applied in March, 1980, and 2 year-old ginseng plants were transplanted in April, 1981, and sampled in August, 1981. Growth an yields in Cylone and Basamid treated plots in the replanted soil were better than those in control. Especially, growth and yields of ginseng in Cyclone treated Plots were comparable to these in untreated virgin soil. Control effect of soil fumigants used on root-rot was in the order of Cylone, Basamid, Telone C-17, and the lest of them showed neglect fur effect. Frequency of red discoloration was 8% in Cyclone treated plots, 9% in Basamid treated plots 83.3% in the untreated ginseng replanted soil, and 2.5% in the untreated virgin soil.

• 한국약용작물학회지
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• 제11권5호
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• pp.340-346
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• 2003

묘삼 재배시 원야토와 약토의 적정 혼합비율을 설정하고 해가림 시설 설치시 기존관행 방법의 문제점을 개선하고 작업효율을 높이기 위하여 시험을 수행 한 결과는 다음과 같다. (1) 상토조제시 약토의 적정 구성비율 설정시험에서 약토함량이 증가할수록 고상은 감소하고, 공극율과 기상, 토양중 OM과 $P_2O_5$ 함량이 증가하는 경향이었다. (2) 약토함량별 지상부 생육은 약토함량 증가에 따라 엽면적, 엽록소는 증가하였으며, 지하부 생육중 근경과 근중이 증가하였다. (3) 약토조성별 규격묘 생산량은 백마사 약토비율이 10:1처리에서 사용가능 묘삼은 750개/칸 수준으로 양호하였다. 2. 해가림 (일복) 전주목 적정높이를 설정하기 위한 시험에서 (4) 전주높이별 광량은 전주높이가 높을수록 광량이 많았으며 평균지온은 전주높이가 150 cm에서 낮아 광량과 지온은 비례하였다. (5) 해가림 시설 전주목 높이가 낮을수록 엽록소 함량과 근중이 증가하는 경향이었고, 사용가능 묘삼수는 처리간 유의성은 없었으며, 또한 관행보다는 그 수가 적었지만 전주높이 150 cm에서 740개/칸로 높았다.

• 한국토양비료학회지
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• 제13권1호
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• pp.13-19
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• 1980

1. 삼포(蔘圃) 및 예정야산지토양를 쓴 incubation시험을 통(通)하여 약토, 수용성질소(水溶性窒素)를 뺀 세척약토, 낙엽(落葉)(활엽수(闊葉樹)와 침엽수(針葉樹)), 골분(骨粉)에서 생성(生成)되는 $NH_4-N$ 과 $NO_3-N$의 양(量) 및 시간경과에 따른 변화를 밝혔다. 2. 질소방출총량은 삼포(蔘圃)와 야산지(野山地) 공(共)히 골분구에서 가장 많고 다음이 약토였다. 시간경과에 따른 방출량(放出量)은 야산지(野山地)의 세척약토구와 낙엽구에서 감소(減少)했을 뿐 기타처리구에서는 증가하였다. 삼포(蔘圃) 약토구에서 생성(生成)된 무기질소(無機窒素)의 대부분(大部分)은 $NO_3-N$였으나 기타(其他) 처리구에서는 절반(折半)이 $NH_4-N$였다. 야산지(野山地) 약토구에서도 대부분(大部分)이 $NO_3-N$였으나 기타(其他) 처리구에서는 주(主)로 $NH_4-N$였다. 3. $NH_4-N$ 생성량(生成量)은 삼포(蔘圃) 야산지(野山地) 공(共)히 골분구에서만 시간(時間)이 감에 따라 증가하였으나 기타(其他) 처리구에서는 감소(減少)하였고 특(特)히 골분구의 값이 높았다. 4. $NO_3-N$ 생성량(生成量)은 삼포(蔘圃)의 어느 처리구에 있어서도 증가하였으나 야산지(野山地)에서는 약토구만 증가하고 기타(其他) 처리구에서는 아주 낮은 값에서 거의 변화가 없었고 특(特)히 약토구의 값이 높았다. 5. 각종(各種) 유기질비료(有機質肥料)에서 생성(生成)된 질소량(窒素量)과 인삼(人蔘)에 의한 질소흡수량(窒素吸收量)을 비교(比較)하였다. 약토에는 많은 $NO_3-N$의 공급(供給)이 기대(期待)될 뿐만 아니라 토양비옥도를 높이고 토양미생물활동을 도와주는 역할(役割)이 있는 반면에 골분(骨粉)에는 단지 질소(窒素)의 공급(供給)만 기대(期待)되고 생성(生成)되는 많은 $NH_4-N$은 인삼재배상(人蔘栽培上) 위험할 것으로 생각 되었다.

• 한국해양공학회지
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• 제15권4호
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• pp.92-100
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• 2001

It is very important to determine the coefficient of earth pressure at rest accurately in order to estimate the behavior of soil structure. For estimation of K/sub 0/-value depending upon the stress history of dry sand, a new type of K/sub 0/-oedeometer apparatus is devised, and the horizontal earth pressure is accurately measured. For this study, 2 types of one-cyclic K/sub 0/-Loading/unloading models have been studied experimentally using four relative densities of the sand. The results obtained in this test are as follows : K/sub on'/ the coefficient of earth pressure at - rest for virgin loading is a function of the angle of internal friction Φ' of the sand and is determined as K/sub on/=1 - 0.914 sin Φ', K/sub ou'/ the coefficient of earth pressure at rest for virgin unloading is a function of K/sub on/ and over consolidation ratio(OCR), and is determined as K/sub ou/=K/sub on/(OCR)K/sup a/. The exponent α, increases as the relative density increases. K/sub or'/ the coefficient of earth pressure at rest for virgin reloading decreases in hyperbola type as the vertical stress, σ/sub v/’, increases. And, the stress path at virgin reloading leads to the maximum prestress point, independent upon the value of the minimum unloading stress. The gradient of this curve, m/sub r/ increases as OCR increases.

• Geomechanics and Engineering
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• 제20권6호
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• pp.505-516
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• 2020

In recent years, Nano-technology significantly invaded the field of Geotechnical engineering, particularly in soil stabilisation techniques. Stabilisation of weak soil is envisioned to modify various soil characteristics by the addition of natural or synthetic materials into the virgin soil. In the present study, laboratory experiments were executed to investigate the influence of nano-silica particles in the consistency limits, compressive strength of the soft clay blended with cement. The results revealed that the high compressibility behaviour of soft clay modified to medium-stiff condition with fewer dosages of cement and nano-silica. The mechanism behind the strength development is verified with the previous researches as well as from Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction test (XRD) and Scanning Electron Microscopy (SEM) analysis. Based on the results, the presence of nano-silica in soft clay blended with cement has a positive effect on the behaviour of soil. This technique proves to be very economical and less detrimental to the environment.

• Geomechanics and Engineering
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• 제17권1호
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• pp.69-79
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• 2019

This work presents an experimental study of the hydromechanical behavior of a natural swelling soil taken from Boumagueur region east of Algeria. Several pathological cases due to the soil shrinkage / swelling phenomenon were detected in this area. In a first part, the hydric behavior on drying-wetting paths was made, using the osmotic technics and saturated salts solutions to control suction. In The second part, using a new osmotic oedometer, the coupled behavior as a function of applied stresses and suction was investigated. It was shown that soil compressibility parameters was influenced by suction variations that an increase in suction is followed by a decrease in the virgin compression slope. On the other hand, the unloading slope of the oedometric curves was not obviously affected by the imposed suction. The decrease in suction strongly influences the apparent preconsolidation pressure, ie during swelling of the samples after wetting.

• The Korean Journal of Ecology
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• 제21권5_2호
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• pp.549-555
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• 1998

The results of a week-long exploration, which was conducted on the soil mite of Mt. Paektu area by our team of the Ecological Society of Korea from July 22nd till July 27th of 1997, are as follows. All mite were picked and examined from the soil of 2,000 cm$^{2}$ from eight respective zones. The total number collected was 384 individuals with 20 families, 33 genera, 38 species including 42 individuals of unknown species. They were classified and identified as 13 families 18 genera 22 species of Oribatei, 4 families 11 genera 12 species of Mesostigmata, 2 families 3 genera 3 species of Prostigmata. Among them 5 species of Laelaptidae, Ascidae and Uropodidae couldn't be classified and identified owing to the shortage of reference. in alphine tundra zone 91 individuals were found, which outnumbered than that of the other surveyed areas. The mite that existed evenly in all around the surveyed areas was Tectocepheus sp. and 32 individuals of them were collected from the virgin forest zone. A comparatively small number of mite was found from sungsaha and the intersection of three streets in Mt. Paektu and Songkangjin town, which accoumts for soil picking from unsuitable places.

• 한국토양비료학회지
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• 제12권1호
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• pp.35-41
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• 1979

상이(相異)한 모암(母岩)에서 유래(由來)되고 이용형태(利用形態)가 상이(相異)한 (미경지(未耕地), 밭, 논) 토양중(土壤中)의 유기인산화합물(有機燐酸化合物)의 존재상태(存在狀態)를 알아내기 위하여 본연구를 실시했든바, 그 결과(結果)는 다음과 같다. 1. 모암(母岩) 및 이용형태(利用形態)와의 차이(差異)와 관계없이 미동정유기인산(未同定有機燐酸)>Inositol-p> 당(糖)-P> 지질(脂質)-P>핵산(核酸)-P의 순(順)으로 분포량(分布量)이 많았다. 2. 토양유기인산화합물(土壤有機燐酸化合物)의 주요형태(主要形態)로 나타난 Inositol-P는 답(畓)> 전(田)> 미경지(未耕地)의 순(順)으로 많았다. Sugar-P 및 Lipid-P는 미경지(未耕地)보다 경작지토양(耕作地土壤)에 더 많이 들어 있으나, 핵산(核酸)의 특유(特有)한 자외부흡수(紫外部吸收)는 미경지(未耕地) 경작지(耕作地) 공(共)히 확인(確認)이 되지 않았다. 3. 토양전유기인(土壤全有機燐과 有機物), 토양전인(土壤全燐), Inositol-P사이에 정(正)의 상관관계가 확인되었으며, 토양중(土壤中)에 있어서 유기물(有機燐)의 함량(含量)과 유기물(有機燐) 함량(含量) 간(間)의 관계에는 경작지(耕作地)와 미견작지(未耕作地間)에 차이(差異)가 있는 것으로 보였다. 4. 토양유기인(土壤有機燐)의 유효화와 그 평가방법에 대해서 고찰했다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2006년도 한국약용작물학회 공동춘계학술발표회
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• pp.614-615
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• 2006

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2008년도 학술발표회 논문집
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• pp.1300-1304
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• 2008

The fact that soil loss causing to increase muddy water and devastate an ecosystem has been appearing upon a hot social and environmental issues which should be solved. Soil losses are occurring in most agricultural areas with rainfall-induced runoff. It makes hydraulic structure unstable, causing environmental and economical problems because muddy water destroys ecosystem and causes intake water deterioration. One of three severe muddy water source areas in Soyanggang-dam watershed is Jawoon-ri region, located in Hongcheon county. In this area, many cash-crops are planted at illegally cultivated agricultural fields, which were virgin forest areas. The purpose of this study is to estimate soil loss with current land uses (including illegal cash-crop cultivation) and soil loss reduction with land use conversion from illegal cultivation back to forest. In this study, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) ArcView GIS system was utilized to assess soil erosion. If the illegally cultivated agricultural areas are converted back to forest, it is expected to 17.42% reduction in soil loss. At the Jawoon-ri region, illegally cultivated agricultural areas located at over 30% and 15% slopes take 47.48 ha (30.83%) and 103.64 ha (67.29%) of illegally cultivated agricultural fields respectively. If all illegally cultivated agricultural fields are converted back to forest, it is expected that 17.41% of soil erosion and sediment reduction, 10.86% reduction with forest conversion from 30% sloping illegally agricultural fields, and 16.15% reduction with forest conversion from 15% sloping illegally agricultural fields. Therefore, illegally cultivated agricultural fields located at these sloping areas need to be first converted back to forest to maximize reductions in soil loss reduction and muddy water outflow from the Jawoon-ri regions.