• Proceedings of the Korean Society of Crop Science Conference
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• 2020.06a
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• pp.194-194
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• 2020

• Proceedings of the Korean Society of Crop Science Conference
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• 2023.04a
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• pp.101-101
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• 2023

• Korean Journal of Soil Science and Fertilizer
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• v.38 no.2
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• pp.59-65
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• 2005

This study was performed to estimate the soil loss on a national scale and grade regions with the potential risk of soil erosion. Universal soil loss equation (USLE) for rainfall and runoff erosivity factors (R), cover management factors (C) and support practice factors (P) and revised USLE for soil erodibility factors (K) and topographic factors (LS) were used. To estimate the soil loss, the whole nation was divided into 21,337 groups according to city county, soil phase and land use type. The R factors were high in the southern coast of Gyeongnam and Jeonnam and part of the western coast of Gyeonggi and low in the inland and eastern coast of Gyeongbuk. The K factors were higher in the regions located on the lower streams of rivers and the plain lands of the western coast of Chungnam and Jeonbuk. The average slope of upland areas in Pyeongchang-gun was the steepest of 30.1%. The foot-slope areas from the Taebaek Mountains to the Sobaek Mountains had steep uplands. Total soil loss of Korea was estimated as $50{\times}10^6Mg$ in 2004. The potential risk of soil erosion in upland was the severest in Gyeongnam and the amount of soil erosion was the greatest in Jeonnam. The regions in which annual soil loss was estimated over $50Mg\;ha^{-1}$ were graded as "the very severe" and their acreage was $168{\times}10^3ha$ in 2004. The soil erosion maps of city/county of Korea were made based on digital soil maps with 1:25,000 scale.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2017.04a
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• pp.67-67
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• 2017

국내의 밭작물 재배에서는 부족한 인력과 시간을 단축하기 위한 농기계 사용이 필수가 되었다. 효율적인 농기계의 개발을 위해서는 농민들의 작업실태 분석이 반드시 선행되어야 한다. 본 연구에서는 감자 재배용 작업기 개발을 위해 전국의 감자 재배 농민을 대상으로 트랙터 작업기 사용실태 조사를 수행하였다. 조사대상은 강원도, 경상북도, 전라남도의 지역중 감자 생산량이 많은 곳을 분류하여 각 지역의 농업기계 대리점에서 추천한 농민을 대상으로 조사표에 의한 방문 면접 설문조사를 실시하였다. 분류된 지역은 강원도 홍천, 평창, 경상북도 고령, 김천, 전라남도 영광, 보성이다. 각 지역별 응답자수는 2명으로 진행하였다. 조사항목은 감자 재배시기, 보유하고 있는 작업기, 트랙터의 모델 및 보유대수, 작업기별 트랙터 주행단수 및 PTO 단수, 작업패턴 등이다. 조사결과, 공통적으로 감자품종 중 수미감자를 선호하는 것으로 조사되었고, 지역별로 시기상의 차이가 있지만 평균적으로 1월~5월과 8월~11월 사이에 감자 이모작을 실시하는 것으로 나타났다. 트랙터의 평균 보유대수는 2대였으며, 평균적으로 중형 트랙터 1대와 대형 트랙터 1대의 비율로 보유하고 있는 것으로 조사되었다. 보유하고 있는 작업기는 로타베이터, 수확기, 시비기, 방제기, 파종기 순으로 보유대수가 많았다. 작업기로 수행하는 밭작업으로는 경운정지, 비닐피복, 시비, 방제, 수확 등이 있었으며, 경운정지용 로터리 작업시 트랙터 주행단수와 PTO 단수는 트랙터의 경우 L2~L3단을 주로 사용하고, PTO의 경우 1단과 2단을 병행하여 사용하는 것으로 조사되었다. 로타베이터 작업패턴은 지역별로 차이를 보였으나, 평균적으로 밭의 모서리를 둘러서 작업하고 이후에 8자형식으로 이동하면서 두둑을 형성하는 것으로 나타났다. 이 작업패턴을 사용하는 이유는 후진을 하지않는 작업환경에서 가장 효율적이고 밭의 모서리에 흙이 모이지 않게하기 위함이라고 하였다.

• Weed & Turfgrass Science
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• v.5 no.4
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• pp.247-255
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• 2016

This study was conducted to provide basic information for weed control by surveying the occurrence of weed species in turf sod production areas. Surveys of weed species occurred in turf sod production areas were conducted in Jangsung-gun, Jeonnam province from September 2014 to May 2016. Total 50 sites of turf sod production areas in two soil conditions were investigated. On the upland soil condition in turf sod production areas, 66 weed species in 27 families were identified and classified to 49 annuals and 17 perennials and on the paddy soil condition, 69 weed species in 22 families were identified and classified to 53 annuals and 16 perennials. Based on the importance values, the most dominant weed species on the upland soil condition in the first survey (September 2014) was Digitaria ciliaris (8.49%), followed by Erigeron annuus (7.94%) and Rorippa indica (6.56%). In the second survey (May 2016) was Oxalis corniculata (7.26%), followed by Capsella bursa-pastoris (6.21%) and Conyza canadensis (6.21%). Whereas the most dominant weed species on the paddy soil condition in the first survey (September 2014) was Erigeron annuus (9.52%), followed by Mazus pumilus (7.41%) and Cyperus iria (6.82%). In the second survey (May 2016) was Commelina communis (5.08%), followed by Alopecurus aequalis (5.08%) and Erigeron annuus (4.79%). This information could be useful for estimation of future weed occurrence and effective weed control methods in turf sod production areas in Jangsung-gun, Jeonnam Province.

• Korean Journal of Soil Science and Fertilizer
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• v.33 no.2
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• pp.92-99
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• 2000

To compare the effect of food waste compost(FWC) application on the sodicity of paddy and upland soil, laboratory experiment was conducted. Six kinds of FWC made of various mixing ratio of food waste and pig slurry as raw material were applied to paddy soil under submerged condition and to upland soil in field water capacity, and were kept at $25^{\circ}C$ under laboratory incubation. The higher the mixing ratio of food waste on making FWC, the higher the FWC showed Na content and EC. Mineralized ratio of cations in FWC during incubation showed no difference between paddy and upland soil. It was high in the order of Na>K>Mg>Ca as 99, 94, 71, and 71%, respectively. NaCl contents of FWC applied to soils against SAR and ESP were fitted well to first linear regression with extremely high significance($R^2=0.99$). Increasing rate of SAR and ESP was higher in upland soil than paddy soil by 2.3 times. The difference was considered to be caused by dilution effect which was exerted by the application of more soil to water ratio to paddy soil than to upland soil on SAR analysis in consideration of cultivating condition. The calculated values of $([Ca^{2+}+Mg^{2+}]/2)^{1/2}$ used as a denominator on SAR calculation showed a little difference among FWC treatments by 2.1~2.4, while [$Na^+$] used as a numerator showed much variance by 3.1~9.5. Therefore, as a parameter for the assessment of FWC quality affecting soil sodicity, the use of only Na content in FWC was proposed without regarding Ca and Mg contents. Soil Ex. Na contents showed extremely high correlation($R^2=0.99$) with ESP. Moreover, because the former can be more easily determined than the latter, soil Ex. Na content was proposed as a new sodicity index.

• 농업기술회보
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• v.48 no.6
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• pp.31-33
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• 2011

최근에 논 소독 다양화 사업과 밭작물 자급률 향상 정책이 동시에 추진됨에 따라 논 콩의 재배면적이 늘어나고 있는 추세다. 따라서 논에서 콩을 안전하게 재배할 수 있는 핵심 기술을 소개한다.

• Korean Journal of Soil Science and Fertilizer
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• v.29 no.2
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• pp.81-85
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• 1996

Tentative consolidation criteria, a kind of land suitability classification, was established for cultivated upland soils. The criteria were composed of systematically quantified individual soil properties such as physiography(relief), slope, available soil depth etc., and local features such as soil complexity, mapping unit separation, width/length ratio etc. The criteria was applied to upland soils in granite area, and sedimentary rock area. It was clear that the comparison of local features among candidated areas, and classification of suitability classes for land consolidation of upland soils was satisfactory for selection. The status of the areas classified to "Well suitable" were distributed on alluvial plains or less dissected rollings with lower complexity of soils occurred and extended acreage in each mapping unit. On the other hand, the areas classified as "Unsuitable" were distributed on the elongated narrow valleys with quite divided mapping units by paddy fields on the valley bottom.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.688-692
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• 2009

본 연구는 전국 토양유실분포도와 토양유실위험 등급도를 작성하는 것을 목적으로 하였다. 토양유실분포도는 RUSLE를 이용하였고, 강우-유출 침식성인자(R)는 기상청의 59개 기상관측소의 1977년부터 2006년까지(30년간)의 강우량 자료를 이용하여 산정하였다. 빈도분석은 FARD를 이용하였고, 전국 R인자를 빈도별로 산정하였다. 토양유실량 분석결과 토지피복별로 초지, 나지 밭의 크기 순서로 토양유실이 발생하고, 우리나라 전체 평균은 약 17.2 ton/ha 정도의 토양유실이 발생하는 것으로 분석되었다. 5년빈도 강우특성에서 전체 토양유실량은 15,000여 톤의 토양유실이 발생하는 것으로 나타났으며, 토지피복 구분에서는 논, 산림, 밭작물 재배지역에서 많은 토양유실이 발생하는 것으로 분석되었다. 토양침유실 위험 등급도 작성은 토양유실위험 등급을 5개 등급으로 구분하여 수행하였다. 분석결과 토양유실위험 2등급인 보통지역이 전체 토양유실량 위험지역의 78.2%로 가장 많은 부분을 차지하고 있으며, 심각한 토양유실 위험지역은 분석지역 전체 중에서 약 1.1%인 $1,038km^2$정도인 것으로 분석되었다. 토지피복별로 심각한 토양유실 위험지역은 나지, 초지, 밭작물 재배지역의 순으로 각각 $93.5km^2$, $168.1km^2$, $327.4km^2$ 정도가 심각한 등급의 토양유실 위험 지역으로 분석되었다.

• Korean Journal of Soil Science and Fertilizer
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• v.43 no.1
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• pp.51-59
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• 2010

The sediments and soils around a mine are likely to be exposed to contamination of arsenic (As) through mining operations. In this study, the factors associated with As movement in soils around a closed zinc (Zn) mine were evaluated by the relationship of As distributions to physico-chemical properties of soils. A sequential extraction scheme, based on a soil P fractionation, was used to assess the As distributionsin solid phases. A significant difference in As distributions was found between paddy and upland soils. While As contents of paddy soils increased with soil depth, those of upland soils decreased with soil depth. In upland soils, As showed additional significant relationships to oxides of Si, Al and Fe. Although a major fraction of As in soils was found to be in the NaOH extractable fraction, As exhibited highly significant relationship to the Zn species that apparently originated from the mine. Therefore, As mobility around Zn mine seems to be governed by mass flow of the particulates containing As-associated Zn in paddy soils, whereas retention reactions such as adsorption, complexation, and precipitation seem to predominate in upland soils.