• 제목/요약/키워드: Soil physical characteristics

검색결과 485건 처리시간 0.029초

산성토의 불포화 특성곡선 산정 (Estimation on Unsaturated Characteristic Curves of Acid Sulfate Soils (ASS))

  • 송영석
    • 지질공학
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    • 제28권1호
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    • pp.25-34
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    • 2018
  • 본 연구에서는 산성토를 대상으로 물리적 특성과 불포화 특성을 조사 및 분석하였다. 부산 일광광산 주변의 산성토를 대상으로 물리적 특성을 조사한 결과 건조단위중량이 $1.246t/m^3$이며, 통일분류법(USCS)상 실트질 모래(SM)에 해당된다. 자동 흙-함수특성곡선(SWCC) 측정장치를 이용하여 건조 및 습윤과정에 대한 흙-함수특성곡선(SWCC)을 산정하였다. 그리고 계수예측방법 가운데 가장 널리 활용되고 있는 van Genuchten (1980) 모델을 적용하여 건조 및 습윤과정에 따른 산성토의 불포화 투수계수함수(HCF)를 산정하였다. 산성토의 불포화 투수계수함수(HCF)는 건조과정의 경우 모관흡수력이 증가함에 따라 지속적으로 감소하지만 습윤과정의 경우 모관흡수력이 낮은 수준에서 상대적으로 작게 감소하고, 수분함입치 직전에 크게 감소함을 알 수 있다. 한편, 건조 및 습윤과정에서의 흙-함수특성곡선과 불포화 투수계수함수는 모두 이력현상이 발생되었다.

슬러지를 이용하여 생산한 인공토양의 특성 (Characteristics of Artificial Soils Produced from Sludge)

  • 윤춘경;김선주;권태영;이남출
    • 한국환경농학회지
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    • 제17권3호
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    • pp.200-204
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    • 1998
  • 상하수처리과정에서 다량 발생하는 슬러지를 소성처리에 의해 생산한 인공토양의 자연에 안전한 환원가능성을 검토하기 위하여 인공토양의 이화학적 특성을 분석하여 밭토양과 비교하였다. 사용한 하수슬러지는 경기도지역의 하수종말처리장에서 그리고 상수슬러지는 경남지역에서 각각 수거하여 인공토양을 생산하였으며, 생산한 인공토양의 분석결과를 요약하면 다음과 같다. (1) 인공토양의 입도분석에 의하면 모두 모래로 분류되었으며, pH는 첨가제인 석회의 영향으로 높아서 알카리성을 띠었고, 투수성은 매우 우수하였다. 이러한 특성들은 인공토양을 적절히 혼합사용할 경우에 산성토양의 중화나 배수불량지역의 투수성개선등의 토양개량효과를 기대할 수 있을 것이다. (2) 저온소성시킨 인공토양은 유기물성분, 질소성분, CEC등이 밭토양에 비하여 높았으며 인성분은 약간 높은 정도이었다. 입장의 크기는 굵은 모래정도이었으며 비중은 밭토양에 비하여 낮은 편이었다. 저온소성한 인공토양은 조경분야의 토양개량재나 매립장의 복토재등으로 사용을 검토중이다. (3) 고온소성시킨 인공토양은 소성과정에서 유기물과 질소성분등이 연소되어 유기물성분, CEC, 비중, 질소성분이 밭토양에 비하여 모두 낮았다. 입자의 크기는 조절이 가능한데 본 연구에서 생산한 크기는 난석(蘭石)정도의 굵기이었다. 고온소성한 인공토양은 난석(蘭石)이나 오염물질의 흡착재등으로 사용을 검토중이다. (4) 중금속성분의 분석결과에 의하면 저온소성한 인공토양에서 구리성분이 토양환경기준을 약간 상회하나 나머지는 모두 엄격한 농경지에 대한 기준치보다 낮았다. 따라서 인공토양만을 사용하여 농경지를 조성하여도 중금속에 의한 오염가능성이 작은데, 기존의 토양에 토양개량재로서 일부 혼합하였을 경우에는 기존토양의 낮은 중금속농도에 의하여 희석되어 중금속에 의한 환경오염 우려는 거의 없을 것으로 판단된다. (5) 본 연구방법에 의한 슬러지의 인공토양생산방법을 본격적으로 적용하기 위해서는 경제성 개선, 다양한 성분의 슬러지에서도 신뢰할 만한 안정성 확보, 그리고 작물실험을 통한 안정성 검증등의 추가연구가 계속되어야 할것으로 생각된다.

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사과 '후지' 품종의 품질에 미치는 토양이화학성의 상대적 기여도 (Relative Contribution rate on Soil Physico-chemical properties Related to Fruit Quality of 'Fuji' apple)

  • 김승희;최인명;한점화;조정건;손인창;임태준;윤해근
    • 한국토양비료학회지
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    • 제44권5호
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    • pp.722-726
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    • 2011
  • The management standard on soil conditions in 'Fuji' apple to produce high quality fruit were not yet made. Therefore, this study was carried out to investigate the optimum soil environmental conditions of ten contents on production of high quality fruit in 'Fuji' apple. The soil and fruit characteristics were analyzed at total 60 orchards in major apple producing areas such as Chungju, Moonkyeung, yeongju, andong, yeosan and yeongcheon (10 orchards an area). The soil environmental factors affected fruit weight was highest relative contribution in saturated hydraulic conductivity of 36.5%. The bulk density and soil pH were low as relative contribution. The fruit weight was influenced by soil physical properties more than soil chemical properties. The soil environmental factors affected sugar content were hydraulic conductivity of 28.3% and organic matter content of 18.2%. The cultivation layer depth and soil pH were low as relative contribution. The fruit coloring was highest relative contribution in saturated hydraulic conductivity 55.9%. while soil pH, cation and soil texture were low. Fruit coloring was high influenced over 70% by soil physical properties. Finally, relative contribution on fruit quality related with sugar content, fruit weight, and coloring were high influenced by saturated hydraulic conductivity of 21.% and organic matter content of 18.7% but bulk density and cultivation layer depth were low relative contribution. The fruit growth and saturated hydraulic conductivity in 'Fuji' apple were very closely related. Therefore, orchard soil management to produce high quality fruit was very importance drainage management and organic matter application. We concluded that scientific soil management is possible by qualifiable of soil management factors.

도시발생 슬러지를 이용한 환경친화적 인공배지 생산 (Production of Environment-friendly Artificial Media for Agriculture Using Urban Sludge)

  • 김선주;윤춘경;양용석
    • 한국농공학회지
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    • 제40권2호
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    • pp.102-111
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    • 1998
  • Large amount of sludge have been generating in the process of water and wastewater treatment in urban area, and it has been making many environmental problems. Currently almost of sludge is landfilled, and since sludge is difficult to handle and dehydrate, the permeated water from the filled-in ground contaminate the surrounding soil and groundwater which may cause serious environmental and sociological problems. The organic component in sludge can be almost removed through the heat treatment process, and the final product is called artificial soil or artificial media according to the temperature control. To produce artificial media using sludge, chabazite and lime were used as an additive, and the mixture of sludge & additives was thermally treated in the firing kiln at about 800~1, 100。C for about fifteen minutes. The physical and chemical characteristics of the produced artificial media were analyzed, and it showed that it can be used as an artificial media for plant production or soil conditioner for farmland. The concentrations of the toxic heavy metals in the artificial media were lower than the soil quality standard for farmland. The characteristics of produced artificial media, using the mixture of sludge and additives through the heat treatment, is similar to the natural chabazite and soil. The analyzed result of the mineral composition of artificial media showed that it has a characteristics similar to natural stable soil, so the produced artificial media may be applied to farmland or water culture without causing adverse effect. Therefore this study showed that the above process can be a feasible alternative for sludge treatment.

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입도분석에 기반한 Deep Neural Network를 이용한 최대 건조 단위중량 예측 모델 평가 (Evaluation of Maximum Dry Unit Weight Prediction Model Using Deep Neural Network Based on Particle Size Analysis)

  • 김명환
    • 한국농공학회논문집
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    • 제65권3호
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    • pp.15-28
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    • 2023
  • The compaction properties of the soil change depending on the physical properties, and are also affected by crushing of the particles. Since the particle size distribution of soil affects the engineering properties of the soil, it is necessary to analyze the material properties to understand the compaction characteristics. In this study, the size of each sieve was classified into four in the particle size analysis as a material property, and the compaction characteristics were evaluated by multiple regression and maximum dry unit weight. As a result of maximum dry unit weight prediction, multiple regression analysis showed R2 of 0.70 or more, and DNN analysis showed R2 of 0.80 or more. The reliability of the prediction result analyzed by DNN was evaluated higher than that of multiple regression, and the analysis result of DNN-T showed improved prediction results by 1.87% than DNN. The prediction of maximum dry unit weight using particle size distribution seems to be applied to evaluate the compacting state by identifying the material characteristics of roads and embankments. In addition, the particle size distribution can be used as a parameter for predicting maximum dry unit weight, and it is expected to be of great help in terms of time and cost of applying it to the compaction state evaluation.

패각을 이용한 농업용 지속성 담지체의 효과에 대한 연구 (A study on the Effect of Agricultural Industry Supporter for Durability using Waste Shell such as Crassostrea gigas)

  • 오은하;공승대
    • 한국응용과학기술학회지
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    • 제27권4호
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    • pp.427-436
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    • 2010
  • Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive pot tests were performed to evaluate characteristics of soils treated by developed waste oyster shells with different water content of soils. Based on test results, eco-friendly Supporter manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements. We got the conclusion by a series of experiment, It is verified that change of pH of soil is improved by mixing with oyster shells. The homogenization method for deducing apparent of oyster shells, which can consider micro-structure of mixed soil, is introduced. The improvement treatment leaded to enlarge fluctuation of soil moisture content. The effect of calcium concentration was good though improvement treatment of physical property. In addition, the crop yield in amelioration plots increased. It means that the increase of crop yield was caused by improvement of soil physical properties rather than improvement of calcium concentration.

하수차집관로 준설토양의 콘크리트골재 적용성 평가에 관한 연구 (Feasibility Study on the Use of Dredged Soil from Sewage Pipes as a Concrete Material)

  • 김준하;김형욱;김인식;이재영
    • 한국지하수토양환경학회지:지하수토양환경
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    • 제22권2호
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    • pp.10-16
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    • 2017
  • Recently, the gap between demand and supply of natural aggregate has increased owing to the depletion of aggregate sources. Therefore, policy support is necessary for the stable supply of aggregate resources. Public and construction works experience problems when they do not receive a steady supply of aggregate. Further, instabilities in aggregate supply lead to increases in aggregate prices, and consequently construction costs. As a result, the likelihood of poor construction using low-grade aggregate increases. It is therefore crucial to put measures in place that deal with these issues. This study aims to reduce the load imposed by aggregate use on the environment by recycling soil dredged from sewage ducts to reduce the gap between supply and demand of fine aggregate. The dredged soil is assessed using an applicability test for quality characteristics and solidification with basic properties. This study aims to secure the safety of dredging soil and solidified objects through interior physical and chemical analyses and to utilize it as a base material for concrete solidification in the future.

고흡수성 합성고분자가 덩굴성 식물의 생육에 미치는 영향 분석 (Effects of Super Absorbent Polymer on the Growth of Vine Plants)

  • 김정호;오득균;윤용한
    • 한국환경과학회지
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    • 제22권7호
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    • pp.801-810
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    • 2013
  • To improve the physical and chemical properties of the soil and increasing water-retaining property of the soil, Superabsorbent synthetic polymeric materials have been used. The experiment carried out from April to July 2012 after the influence evaluation of Superabsorbent synthetic polymeric materials to vines plant. The result shows that the study of Hedera japonica Tobler, the growth and the survival rates rank as media > hydroponic > superabsorbent synthetic polymers, and the growth and the survival rates are considerably pessimistic in the experiment of hydroponic and superabsorbent synthetic polymers. In the study of Trachelospermum asiaticum var. intermedium, the growth and the survival rates rank as hydroponic > media > superabsorbent synthetic polymers, the difference between the experiment of hydroponic and is very small and the survival rates are not very good in the experiment of superabsorbent synthetic polymers. In the study of Euonymus fortunei var. radicans Rehder,it is insignificantly difference among the different of planting based. Judging from these results, the differences are depending on the species of plants. The thesis holds that the characteristics of plant should be considered in plant cultivation and soil improvement in the future, and it is desirable to use the appropriate mixing ratio of soil in soil improvement as well.

농업환경 분야에서 토양 리질리언스 분야별 평가 방법 (Evaluation Methods of Soil Resilience Related to Agricultural Environment)

  • 김민석;민현기;현승훈;김정규
    • Ecology and Resilient Infrastructure
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    • 제7권2호
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    • pp.97-113
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    • 2020
  • 토양은 인간의 삶의 터전이자 식량안보를 책임질 수 있는 근간으로, UN의 지속가능한 개발 목표에서도 중요하게 다루고 있다. 농업환경에서 토양 리질리언스는, 불확실성과 예측불가능성이 높은 시대에 건전하고 지속가능한 토양 관리를 위해 반드시 필요한 연구분야이다. 토양 리질리언스의 정의는 연구자들마다 조금씩 다르나 교란에 대한 회복과 저항 개념을 공통적으로 포함하고 있다. 본 연구에서는 다양한 종류의 교란에 대한 토양 리질리언스의 반응을 평가하기 위하여 사용된 토양의 물리적, 화학적, 생물학적 특성들을 정리하였다. 이어서 토양 리질리언스 연구의 시공간적 범위가 넓은 것에 기인한 다양한 통계 처리 기법들과 리질리언스 정량화 방법들을 정리하였다. 또한 많은 토양 리질리언스 연구들은 공통적으로 (1) 토양 및 부지 선정 (2) 스트레스 및 교란 (독립변수) 설정 (3) 토양 특성 및 지표 (종속변수) 설정 (4) 다양한 시공간적 규모 (scale) 실험 수행 (5) 데이터 통계분석 등 5단계에 걸쳐 수행되어왔음을 확인할 수 있었다. 선행 및 이번 연구를 통해 토양 리질리언스의 일반적 개론을 다루었으며, 이를 바탕으로 국내 농업 환경을 고려한 실질적인 연구가 수행되어야 할 것이다.

Growth and yield responses of rice varieties to various soil water deficit conditions under different soil types

  • Kikuta, Mayumi;Samejima, Hiroaki;Magoti, Rahab;Kimani, John M.;Yamauchi, Akira;Makihara, Daigo
    • 한국작물학회:학술대회논문집
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    • 한국작물학회 2017년도 9th Asian Crop Science Association conference
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    • pp.322-322
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    • 2017
  • To avoid drought stress under rainfed upland conditions, it is important for rice to efficiently utilize water at shallow soil layers supplied by rainfall, and access to water retained in deer soil layers. The root developmental characteristics of rice, which play important role in the adaptability to drought conditions, vary depending on the variety. Moreover, water availability for plant differs depending on the soil types that have different physical properties such as water holding capacity, permeability, capillary force, penetration resistance, etc. In this study, we evaluated growth and yield responses of rice varieties to various soil water deficit conditions under three different soil types. The experiment was conducted in a plastic greenhouse at the Kenya Agricultural and Livestock Research Organization-Mwea from October 2016 to January 2017. Two upland varieties (NERICA 1 and 4) and one lowland variety (Komboka) were grown in handmade PVC pots (15.2 cm diameter and 85.0 cm height) filled with three different types of soil collected from major rice-growing areas of the country, namely black cotton (BC), red clay (RC), and sandy clay (SC). Three watering methods, 1) supplying water only from the soil surface (W1), 2) supplying water only from the bottom of the pots (W2), and 3) supplying water both from the soil surface and the bottom of pots (W3), were imposed from 40 days after sowing to maturity. Soil water content (SWC) at 20, 40, and 60 cm depths was measured regularly. At the harvesting stage, aboveground and root samples were collected to determine total dry weight (TDW), grain yield, and root length at 0-20, 20-40, 40-60, and 60-80 cm soil layers. Irrespective of the watering methods, the greatest root development was obtained in RC, while that in BC was less than other two soils. In BC, the degree of yield reduction under W1 was less than that in RC and SC, which could be attributed to the higher water holding capacity of BC. In RC, the growth and yield reduction observed in all varieties under W1 was attributed to the severe drought stress. On the other hand, under W2, SWC at the shallow soil depth in RC was maintained because of its higher capillary force compared with BC and SC. As the result, growths and yields in RC were not suppressed under W2. In SC, deep root development was not promoted by W2 irrespective of the varieties, which resulted in significant yield losses. Under W1, the rice growth and yield in SC was decreased although shallow root development was enhanced, and the stomatal conductance was maintained higher than RC. It was suspected that W1 caused nutrients leaching in SC because of its higher permeability. Under rainfed conditions, growth and yield of rice can be strongly affected by soil types because dynamics of soil water conditions change according to soil physical properties.

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