• Title/Summary/Keyword: 시설밀도

Search Result 232, Processing Time 0.028 seconds

Effect of Agents to Improve Soil Physical Properties on Aster scaber in Plastic House (참취 시설재배지 토양 물리성 개선을 위한 개량제 처리 효과)

  • Gue-Saeng Yeom; Jung-Seob Moon;Song-Hee Ahn;Se-Hyun Ki;Min Sil Ahn
    • Proceedings of the Plant Resources Society of Korea Conference
    • /
    • 2020.08a
    • /
    • pp.70-70
    • /
    • 2020
  • 참취(Aster scaber)는 국화과에 속하는 여러해살이식물로 취나물로 분류되어 전국에서 재배되고 있으며 주로 시설재배지 조기재배 작형으로 많이 재배하고 있다. 참취의 잎과 줄기는 맛과 향기가 독특하여 예로부터 생채, 묵나물 등으로 이용되어 왔으며 칼슘, 철분, 비타민 A 등이 풍부하여 건강식품으로서도 가치가 높고 한약재로도 사용되기도 한다. 최근에는 항암효과와 더불어 콜레스트롤을 저하시키는 약리적 효능이 있는 것으로 밝혀져 기능성 식품으로도 각광 받고 있다. 참취 시설재배 시 통상 3년 마다 갱신이 이루어지고 있는데 그 이유로는 시설재배지 특성상 양분의 과다투입에 의한 염류집적과 잦은 관수로 물리성이 악화되어 참취의 생육이 저하되어 수량이 감소하는 결과를 초래한다. 본 연구는 토양개량제 처리에 따른 토양 물리화학성과 참취의 생육에 미치는 영향을 검토하여 참취 시설재배 농가에 활용할 수 있는 방안을 개발하고자 시험을 수행하였다. 2018년 4월부터 2020년 7월까지 전라북도 농업기술원 허브산채시험장에서 참취 시설재배를 대상으로 무처리, 볏짚 1,000kg/10a, 왕겨숯 1,000kg/10a, 야자섬유 1,000kg/10a, 4처리구로 하여 시기별 토양특성 변화 및 생육 상황을 조사하였다. 자재 처리 후 3년차 토양 물리성의 변화는 볏짚 시용에서 가장 낮은 용적밀도 1.23g/cm3와 가장 높은 공극률 53.50%을 보였다. 토양 삼상은 고상은 왕겨숯에서 49.41%로, 액상은 왕겨숯에서 24.92%로, 기상은 볏짚에서 32.09%로 가장 높았다. 토양화학적 특성을 조사한 결과 토양 pH는 7.2~7.3, 토양유기물 함량은 32~39g/kg, 유효인산 함량은 440~487mg/kg 이었으며 처리 전 토양에 비하여 유기물 함량은 증가하고 유효인산은 낮아지는 경향을 보였다. 치환성 양이온 K, Ca, Mg는 K는 0.77~0.88cmolc/kg로 낮아졌고, Ca와 11.56~14.09cmolc/kg, Mg는 2.93~3.22cmolc/kg로 증가하였다. 참취 생육특성은 초장은 24.8~26.4cm, 엽장은 8.3~8.7cm, 엽폭은 6.3~6.7cm, 줄기수는 6.9~7.2주로 대조구에 비해 좋은 생육 상황 상황을 보였으며, 수량은 919~1,161kg/10a 으로 자채 처리구에서 대조구에 비해 수량성 또한 높았다 참취 다년재배지 토양개량제 시용함으로써 토양의 유기물함량 증가와 토양의 용적밀도 감소와 토양 공극율 증가 등 토양의 물리화학성을 개선할 수 있을 것으로 기대된다.

  • PDF

Development of Traffic Accident Forecasting Models Considering Urban-Transportation System Characteristics (토지이용 및 교통특성을 반영한 교통사고 예측모형 개발 연구)

  • Park, Jun-Tae;Jang, Il-Jun;Son, Ui-Yeong;Lee, Su-Beom
    • Journal of Korean Society of Transportation
    • /
    • v.29 no.6
    • /
    • pp.39-56
    • /
    • 2011
  • This study proposed a traffic accident prediction model developed based on administrative districts of Seoul. The model was to find the relationship between accident rates and the representative land usage of the districts (development density) - the higher the development density (building floor area) is, the higher the traffic accident rate is. The findings showed that traffic accident statistics differ from (1) residential building floor area, (2) commercial building floor area and (3) business building floor area.

Soil Physical Properties of Arable Land by Land Use Across the Country (토지이용별 전국 농경지 토양물리적 특성)

  • Cho, H.R.;Zhang, Y.S.;Han, K.H.;Cho, H.J.;Ryu, J.H.;Jung, K.Y.;Cho, K.R.;Ro, A.S.;Lim, S.J.;Choi, S.C.;Lee, J.I.;Lee, W.K.;Ahn, B.K.;Kim, B.H.;Kim, C.Y.;Park, J.H.;Hyun, S.H.
    • Korean Journal of Soil Science and Fertilizer
    • /
    • v.45 no.3
    • /
    • pp.344-352
    • /
    • 2012
  • Soil physical properties determine soil quality in aspect of root growth, infiltration, water and nutrient holding capacity. Although the monitoring of soil physical properties is important for sustainable agricultural production, there were few studies. This study was conducted to investigate the condition of soil physical properties of arable land according to land use across the country. The work was investigated on plastic film house soils, upland soils, orchard soils, and paddy soils from 2008 to 2011, including depth of topsoil, bulk density, hardness, soil texture, and organic matter. The average physical properties were following; In plastic film house soils, the depth of topsoil was 16.2 cm. For the topsoils, hardness was 9.0 mm, bulk density was 1.09 Mg $m^{-3}$, and organic matter content was 29.0 g $kg^{-1}$. For the subsoils, hardness was 19.8 mm, bulk density was 1.32 Mg $m^{-3}$, and organic matter content was 29.5 g $kg^{-1}$; In upland soils, depth of topsoil was 13.3 cm. For the topsoils, hardness was 11.3 mm, bulk density was 1.33 Mg $m^{-3}$, and organic matter content was 20.6 g $kg^{-1}$. For the subsoils, hardness was 18.8 mm, bulk density was 1.52 Mg $m^{-3}$, and organic matter content was 13.0 g $kg^{-1}$. Classified by the types of crop, soil physical properties were high value in a group of deep-rooted vegetables and a group of short-rooted vegetables soil, but low value in a group of leafy vegetables soil; In orchard soils, the depth of topsoil was 15.4 cm. For the topsoils, hardness was 16.1 mm, bulk density was 1.25 Mg $m^{-3}$, and organic matter content was 28.5 g $kg^{-1}$. For the subsoils, hardness was 19.8 mm, bulk density was 1.41 Mg $m^{-3}$, and organic matter content was 15.9 g $kg^{-1}$; In paddy soils, the depth of topsoil was 17.5 cm. For the topsoils, hardness was 15.3 mm, bulk density was 1.22 Mg $m^{-3}$, and organic matter content was 23.5 g $kg^{-1}$. For the subsoils, hardness was 20.3 mm, bulk density was 1.47 Mg $m^{-3}$, and organic matter content was 17.5 g $kg^{-1}$. The average of bulk density was plastic film house soils < paddy soils < orchard soils < upland soils in order, according to land use. The bulk density value of topsoils is mainly distributed in 1.0~1.25 Mg $m^{-3}$. The bulk density value of subsoils is mostly distributed in more than 1.50, 1.35~1.50, and 1.0~1.50 Mg $m^{-3}$ for upland and paddy soils, orchard soils, and plastic film house soils, respectively. Classified by soil textural family, there was lower bulk density in clayey soil, and higher bulk density in fine silty and sandy soil. Soil physical properties and distribution of topography were different classified by the types of land use and growing crops. Therefore, we need to consider the types of land use and crop for appropriate soil management.

GIS-Based Methods to Assess the Population Distribution Criteria for Undesirable Facilities: The Case of Nuclear Power Plants (비선호 시설의 인구분포 관련 입지기준 평가를 위한 GIS-기반 방법론 연구 -원자력 발전소의 경우-)

  • Lee, Sang-Il;Cho, Daeheon
    • Journal of the Korean Geographical Society
    • /
    • v.47 no.5
    • /
    • pp.755-774
    • /
    • 2012
  • The main objective of the study is to propose GIS-based methods to assess the population distribution criteria for undesirable facilities such as nuclear power plants. First of all, a review of the relevant criteria was conducted for the official documents compiled by such institutions as IAEA (International Atomic Energy Agency), U.S. NRC (Nuclear Regulatory Commission), and some national institutes including the Korea Institute of Nuclear Safety. It is informed from the review that the fundamental principle underlying the various criteria is to maximize the distance between a plant and the nearest population center. It is realized that two interrelated GIS-based techniques need to be devised to put the principle into practice; sophisticated ways of representing population distribution and identifying population centers. A dasymetric areal interpolation is proposed for the former and cell-based and area-based critical density methods are introduced. Grid-based population distributions at various spatial resolutions are created by means of the dasymetric areal interpolation. By applying the critical density methods to the gridded population distribution, some population centers satisfying the population size and density criteria can be identified. These methods were applied to the case of the Gori-1 nuclear power plant and their strengths and limitations were discussed. It was revealed that the assessment results could vary depending upon which method was employed and what values were chosen for various parameters. This study is expected to contribute to foster the applications of methods and techniques developed in geospatial analysis and modeling to the site selection and evaluation.

  • PDF

Container Types Influence Chamaecyparis obtusa Seedling Growth During Nursery Culture (시설양묘과정에서 용기에 따른 편백 유묘의 생장 특성 변화)

  • Cho, Min Seok;Yang, A-Ram;Hwang, Jaehong
    • Journal of Korean Society of Forest Science
    • /
    • v.103 no.4
    • /
    • pp.556-563
    • /
    • 2014
  • The purpose of this study was to evaluate the effects of container types on seedling growth of Chamaecyparis obtusa (2-year-old) in the container nursery culture. We used three container types [20 cavities (400 mL/cavity, $150seedlings/m^2$), 24 cavities (320 mL/cavity, $200seedlings/m^2$), and 35 cavities (240 mL/cavity, $260seedlings/m^2$)] and measured root collar diameter (RCD), height, biomass, root density and seedling quality index (SQI). The RCD, height, biomass, root density and SQI were the highest at 20 cavities/tray because this container has the largest volume and lowest seedling density. However, H/D and T/R ratio at all container types were not significantly different. The total biomass per unit area ($m^2$) were the lowest at 35 cavities/tray and those at both 20 and 24 cavities/tray were not significantly different. Container volume was positively correlated with RCD, height, biomass, root density and SQI except for H/D and T/R ratio, while seedling density negatively affected on them. Based on these results, 20 cavities/tray are optimal for container seedling production of C. obtusa. Usage of optimal container will make us get better quality seedlings and reduction of production costs in the container nursery as well as good field performances with higher survival rate in plantation.

Development of Optimal Evacuation Model using Civil Defense Evacuation Facilities Survey Data (민방위 대피시설 실태 분석을 통한 최적의 대피모형 개발에 관한 연구)

  • Yeo, Wookhyun;Park, Namhee;Kim, Taewhan;Koo, Wonyong
    • Journal of the Society of Disaster Information
    • /
    • v.8 no.1
    • /
    • pp.71-80
    • /
    • 2012
  • It is necessary to establish guidelines when we selecting the civil defense evacuation facilities through quantitative analysis by civil defense evacuation facilities volume. The purpose of this study is to evaluate according to population density and distribution of the capacity of evacuation facilities. The results of this study are as follows. First, it is necessary to consider the capacity of evacuation facilities in order to set up the exact districts of civil defense evacuation facilities. Second, basic data based on to compare the condition of civil defense evacuation facilities is produced by an analysis on evacuation status of the target region. Third, it is proved to consider topographical conditions which do not move the shortest distance. Fourth, in order to create a realistic model, it is necessary to consider the model set various parameters.

Economic Injury Level of the Striped Cabbage Flea Beetle, Phyllotreta striolata (Coleoptera: Chrysomelidae), on Chinese Cabbage (시설배추에서 벼룩잎벌레의 경제적 피해수준 설정)

  • Lee, Young Su;Kim, Jin Young;Hong, Soon Sung;Park, Hong Hyun
    • Korean journal of applied entomology
    • /
    • v.53 no.2
    • /
    • pp.93-96
    • /
    • 2014
  • This study was conducted to determine the economic injury levels and control thresholds for the striped cabbage flea beetle, Phyllotreta striolata (Coleoptera: Chrysomelidae), on Chinese cabbage at two different planting times. The number of inoculated adults per 10 cabbages was 0, 2, 4, 8, and 16 at the early developmental stage of the cabbage5 days after planting) and 0, 10, 20, 30, and 40 at the middle developmental stage (30 days after planting). Damages to the leaves at the first inoculation were 2.5-21.1% and at the second inoculation were 1.8-26.3% after harvesting. The linear relationships between population density and yield reduction were as follows: Y = 1.3475X + 2.135 ($R^2$ = 0.8699) at the early developmental stage and Y = 0.703X - 1.78 ($R^2$ = 0.966) at the middle developmental stage. On the basis of these results, the economic injury levels caused 5% loss of yield; there were 2.1 adults per 10 Chinese cabbage at the early developmental stage and 9.6 adults per 10 Chinese cabbage at the middle developmental stage.

Estimation of the Bulk Density for Recyclable Residential Wastes (폐기물 관리시설 설계를 위한 재활용성 생활폐기물의 겉보기밀도 평가에 관한 연구)

  • Kim, Byung-Tae;Kim, Myeong-Woon;Lee, Chang-Hae
    • Resources Recycling
    • /
    • v.26 no.6
    • /
    • pp.102-107
    • /
    • 2017
  • To estimate the bulk density applying the composition rate for recyclable residential waste, the composition rates by volume and weight basis, the bulk densities of the separated and commingled wastes were investigated four times respectively for recyclable waste of 1,800 kg transported to waste recovery facility. The bulk densities for separated wastes were $379.0kg/m^3$ of glass bottles that is highest and metals, residues, others, cans, plastics in order. The composition rates for each separated waste were changed widely depending on either volume basis or weight basis. The composition rate by weight basis as 40.6% of the glass bottles, 32.6% of the plastics were changed to 60.2% of the plastics and 8.9% of the glass bottles in that by volume basis. The bulk density of the commingled wastes applying the composition rate by volume basis showed the similar value to the measured density than by weight basis. So it was estimated that the composition rate by volume basis was appropriate for determining the bulk density of the commingled recyclable wastes.

Assessment of Radionuclide Behavior on Agricutural Soil deposited from Atmosphere (대기중 방사성 핵종의 토양침적시 거동평가)

  • 유동한;이한수
    • Proceedings of the Korea Air Pollution Research Association Conference
    • /
    • 2002.11a
    • /
    • pp.77-78
    • /
    • 2002
  • 원자력시설이나 원자력발전소에서 사고가 발생하여 대기로 방출된 방사능물질은 두 가지 주요경로를 통해 인체노출이 일어난다 첫째는 지역내 대기중에 존재하는 방사성물질이 인체의 호흡이나 피부 등을 통해 체내로 흡입되는 직접적인 노출 (Direct Exposures)이고 다른 하나는 방사능물질이 대기로부터 주변의 토양에 침적하고 이러한 토양에서 재배된 오염된 농작물들 (쌀, 보리, 밀, 또는 과일, 채소)을 인간이 섭취하거나, 방사능물질에 오염된 목초로 키운 축산물(소, 돼지, 닭 등)과 이들로 생산하는 제품들(우유, 고기, 달걀 등)을 인간이 섭취함으로써 이루어지는 보다 간접적인 인체노출(Indirect Exposures)이 있을 수 있다. (중략)

  • PDF

Calculating Raw Materials Mixing Ratios for Solid Composting Using a Spreadsheet Approach (스프레드시트 기법을 이용한 고형퇴비화 재료 혼합비율의 계산)

  • 홍지형;박금주
    • Journal of Animal Environmental Science
    • /
    • v.5 no.3
    • /
    • pp.197-202
    • /
    • 1999
  • 퇴비화 재료를 혼합하는 목적은 재료를 퇴비황에 최적조건으로 조성하여 퇴비화 성능을 향상 시키고 취기발생을 억제하기 위함이다. 퇴비화성능에 미치는 요인으로서는 C/N비, 수분 함량, 산도(pH), 산물밀도, 입자크기 등이 있다. 이 중에서 C/N비는 적정값으로 조성하기 어렵다. 본 자료는 퇴비재료의 적정 수분 함량 및 C/N비를 조성하기 위해 각 요소재료의 혼합비율을 제시하고 있다.