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RISS 인기검색어
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- 저자 : ( Hyen Chung Chun ) (검색결과 97 건)
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Hyen Chung Chun(전현정),Sanghun Lee(이상훈),Hyeok Gong(공동혁),Ki Youl Jung(정기열) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Application of chemical fertilizer and manure to Soybean(Glycine max (L) Merr.) cultivation from paddy fields can cause degeneration in soil fertility and environmental pollution. In order to improve soil fertility with less fertilizer and manure, it is important to understand effects of fertilizer and manure in soybean cultivation from paddy fields. In this study, three paddy field sites were converted to upland by soybean cultivation located at Miryang in 2018. A chemical fertilizer and manure treatment were applied to one site (Chem+Manu), only chemical fertilzer treatment was applied to another site (Chem) and no fertilizer and manure to the third site (no treatment). Soybean has been cultivated in all three sties with three treatments every year. In order to compare upland soils with soybean cultivation, an upland field with continuous soybean cultivation with fertilizer and manure was selected as a upland soil site. All soil samples were taken during Mach and April before soybean planting in 2021. The sites with manure application had the same manure and this manure was also analyzed. All samples were analyzed for physical properties such as soil texture, bulk density and soil moisture content and chemical properties such as pH, CEC, Available P₂O<SUB>5</SUB>, NO₃, etc. All sites had the same soil texture as sitl loam. Statistical analyses were performed in SPSS(Statistical Package for the Social Science) at 95% significant level. Application of fertilizer and manure showed significantly different chemical and physical properties. Values of EC, organic matter content, organic carbon, and CEC were greater from the Chem+Manu soil than other soils. Soils from No treatment and Chem sites had no difference in soil properties. Meanwhile, NO₃ and NH₄ values were greater from all paddy field soils and smaller pH than the upland soil. Application of manure increased soil moisture content in soil, while the upland soil had the smallest soil moisture content and greatest bulk density. The upland soil site also had fertilizer and manure application similar to Chem+Manu site. But soil drainage level may cause these different physical property results. As a conclusion, application of fertilizer and manure will affect quality of soil and it is important manage quantitity of both application.
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Chun, Hyen Chung,Jung, Ki Yuol,Choi, Young Dae,Lee, Sanghun 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.6
In Korea, the largest agricultural lands are paddy fields which have poor infiltration and drainage properties. Recently, Korean government pursuits cultivating upland crops in paddy fields to reduce overproduced rice in Korea. In order to succeed this policy, it is critical to set criteria suitability classification for upland crops cultivating in paddy field soils. The objective of this study was developing guideline of suitability classification for sesame cultivation in paddy field soils. Yields of sesame cultivated in paddy field soils and soil properties were investigated at 40 locations at nationwide scale. Soil properties such as topography, soil texture, soil moisture contents, slope, and drainage level were investigated. The guideline of suitability classification for sesame was determined by multi-regression method. As a result, sesame yields had the greatest correlation with topography, soil moisture content, and slope. Since sesame is sensitive to excessive soil moisture content, paddy fields with well drained, slope of 7-15% and mountain foot or hill were best suit for cultivating sesame. Sesame yields were greater with less soil moisture contents. Based on these results, area of best suitable paddy field land for sesame was 161,400 ha, suitable land was 62,600 ha, possible land was 331,600 ha, and low productive land was 1,075,500 ha. Compared to existing suitability classification, the new guideline of classification recommended smaller area of best or suitable areas to cultivate sesame. This result may suggest that sesame cultivation in paddy field can be very susceptible to soil moisture contents.
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Hyen Chung Chun,Ki Yuol Jung,Young Dae Choi,Sanghun Lee,Hang Won Kang 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.4
In Korea, the largest agricultural lands are paddy fields which have poor infiltration and drainage properties. Recently, Korean government pursuits cultivating upland crops in paddy fields to reduce overproduced rice in Korea. In order to succeed this policy, it is critical to understand topographic information of paddy fields and its effects on upland crops cultivating in paddy field soils. The objectives of this study were characterizing growth properties of soybean and adzuki bean from paddy fields with three soil topographic features and soil water effects which were induced by topographic features on sesame and perilla. The crops were planted in paddy fields located in Miryang, Gyeongnam with different topographies; mountain foot slope, local valley and alluvial plain. Soil water contents and groundwater levels were measured every hour during growing season. The paddy field of mountain foot slope was significantly effective to alleviate wet injury for soybean and adzuki bean in paddy fields. The paddy field of mountain foot slope decreased average soil water content and groundwater level during cultivation. Stress day index (SDI) from the alluvial plain paddy field had the greatest values from both crops and the smallest from ones of mountain foot slope. This result meant that soybean and adzuki bean had the smallest stress of soil water from the paddy field of mountain foot slope and the greatest from one of alluvial plain. It is important to consider topography of paddy fields to reduction of wet injury and to increase in yields.
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Hyen Chung Chun,Ki Yuol Jung,Young Dae Choi,Sanghun Lee,Hang Won Kang 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4
Recently Korea has severe drought during sowing and early vegetative period of soybean and adzuki bean cultivation. Soybean and adzuki bean are an important legume crops in Korea, so it is important to understand adaptation of these crops to water stress. This study investigated changes of morphological properties and spatial distribution of soybean and adzuki bean roots under different soil moisture contents. The experiment was performed at National Institute of Crio Science in Miryang. Soybeans and adzuki beans were planted in a test tube with 40 in length, 20 in width, and 4 cm in depth and grew for 20 days. The tubes were filled with turface soil with six soil moisture treatments (30, 40, 50, 60, 70 and 100%). The root images were obtained every 2 days using a scanner. Root properties from the images were characterized by root length, depth, surface area, number of roots and fractal parameters (fractal dimension and lacunarity). The root depth, length, surface area and number of roots increased as soil moisture increased from both crops. The values of fractal dimension and lacunarity increased as soil moisture increased. These results indicated that greater soil moisture induced more heterogeneous root structure. Correlation analysis among morphological properties and fractal parameters resulted in that the fractal dimension had the greatest correlation with depth, number of roots and surface area from soybean. Lacunarity from soybean showed a greater correlation with number of roots and surface area than ones from adzuki bean. This result indicates that fractal dimension is strongly related to branching of roots. Soybean and adzuki bean are sensitive to soil moisture content in early vegetative stage and they require soil moisture greater than 70% to develop full root structure. These results would be useful to understand soybean and adzuki bean responses to water stress and to manage irrigation amounts in cultivation.
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Yearly Characterization of Soil Properties from Soybean Cultivation at Paddy Fields
Hyen Chung Chun(전현정),Sanghun Lee(이상훈),Hyeok Gong(공동혁),Ki Youl Jung(정기열) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Soybean(Glycine max (L) Merr.) cultivation from paddy fields has many benefits such as increase in yields, etc. However there have been found problems such as increase in desease and decrease in yields from contiguous soybean cultivation at paddy fields. This study investigated soil physical and chemical properties from paddy field soils by different soybean cultivation years; 1~3 year, 4~6 year and over 10 year. Ten sites from each year category were selected in Andong, Kyeongbuk and Gimje, Jeonbuk area in Korea. Soybean is only crop cultivated in all 30 sites and standard chemical fertilizer and manure were applied every year. Soil samples were taken during Mach and April before soybean planting in 2021. All samples were analyzed for physical properties such as soil texture, bulk density and soil moisture content and chemical properties such as pH, CEC, Available P₂O<SUB>5</SUB>, NO₃, etc. Statistical analyses were performed in SPSS(Statistical Package for the Social Science) at 95% siginificant level. Results of physical analyses did not show significant different as cultivation period increase, however chemical properties showed difference across different cultivation period. Values of NH₄ and NO₃ from over 10 year sites were significantly smaller than ones from less than 6 year sites. On the other hand, phosphate related properties, such as available P₂O<SUB>5</SUB> and organophosphoric acid, increased as soybean cultivation period increased. Paddy fields converted to soybean cultivation from rice under 3 years showed relatively great nitrogen and small phosphate values. These results may related to rice cultivation condition such as flooded condition. Nitrogen contents tend to decrease and phosphate contents to increase as soybean cultivation continues. This may be resulted in continuous application of fertilizer and manure to soil. Thsese results indicated that continuous cultivation of soybean in paddy fields may benefit for yield increase, but this benefit decrease under increase of cultivation period without manage chemical properties in soils.
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Hyen Chung Chun,Suk Young Hong,Kwan Cheol Song,Yihyun Kim, Byung,Keun Hyun,Budiman Minasny 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.4
This study investigates the prediction of soil OM on Korean soils using the Visible-Near Infrared (Vis-NIR) spectroscopy. The ASD Field Spec Pro was used to acquire the reflectance of soil samples to visible to near-infrared radiation (350 to 2500 ㎚). A total of 503 soil samples from 61 Korean soil series were scanned using the instrument and OM was measured using the Walkley and Black method. For data analysis, the spectra were resampled from 500-2450 nm with 4 nm spacing and converted to the 1<SUP>st</SUP> derivative of absorbance (log (1/R)). Partial least squares regression (PLSR) and regression rules model (Cubist) were applied to predict soil OM. Regression rules model estimates the target value by building conditional rules, and each rule contains a linear expression predicting OM from selected absorbance values. The regression rules model was shown to give a better prediction compared to PLSR. Although the prediction for Andisols had a larger error, soil order was not found to be useful in stratifying the prediction model. The stratification used by Cubist was mainly based on absorbance at wavelengths of 850 and 2320 ㎚, which corresponds to the organic absorption bands. These results showed that there could be more information on soil properties useful to classify or group OM data from Korean soils. In conclusion, this study shows it is possible to develop good prediction model of OM from Korean soils and provide data to reexamine the existing prediction models for more accurate prediction.
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Three Dimensional Measurements of Pore Morphological and Hydraulic Properties
Hyen-Chung Chun(전현정),Daniel Gimenez,Sung-Won Yoon(윤성원),Richard Heck,Laise Ziska,Kate Geaorge,Yeon-Kyu Sonn(손연규),Sang-Keun Ha(하상건),Tom Elliot 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.4
포어 네트웍 모델들 (Pore network model)은 토양 공극의 구조를 조사할 때 유용한 도구들이다. 이런 모델들은 삼차원 이미지들에서 공극의 구조와 관련된 양적 정보를 제공한다. 이 연구는 포어 네트웍 모델을 이용하여 공극의 구조와 수리학적 특성들을 양적으로 측정하였다. 연구목표는 큰 크기의 이미지에서 공극의 구조에 관한 양적 정보를얻기 위해 포어 네트웍 모델을 적용하고, 토양수분특성과 수리 전도도를 삼차원 이미지로부터 계산하고 이 값들은 실험을 통해 얻어진 실험값들과 결합하여 토양의 수리적 특성을 분석하는 것이었다. 토양 시료들은 발티모아 도시 중심에 있는발티모어 과학센터에 위치한 실험부지에서 채취되었다. 불교란 원주형 시료들이 채취되었고, 22 μm 의 해상도로 x선 단층 촬영되었다. 포어 네트웍은 중심축 변형에 의해 공극에서 축출되었고 이를 바탕으로 공극 구조가 계산되었다. 토양수분특성과 불포화 수리 전도도 값들은 토양 이미지에서 계산 되었다. 토양 밀도, 토양수분특성과 불포화 수리 전도도들은 3 토양 시료들로부터 실험을 통해 구하였다. 삼차원 이미지 분석은 토양 공극의 특성들을, 예를 들어 공극 부피, 길이, 굴곡도, 가장 정확히 분석하였다. 이런 정확한 분석은 토양 내 수문학적 정보를 정확히 산출할 수 있게 하였다. 계산된 값과 실험을 통한 실험치의 결합은 공극에 대한 더 광범한 범위를 분석할 수 있게 하였다. 이 연구를 통해 이미지에서 계산되고 측정된 수문학적 자료들은 토양내 대기공과 소기공을 모두 다 설명해 줄 수 있는 방법이라는 것이 밝혀졌다. Pore network models are useful tools to investigate soil pore geometry. These models provide quantitative information of pore geometry from 3D images. This study presents a pore network model to quantify pore structure and hydraulic characteristics. The objectives of this work were to apply the pore network model to characterize pore structure from large images to quantify pore structure, calculate water retention and hydraulic conductivity properties from a three dimensional soil image, and to combine measured hydraulic properties from experiments with calculated hydraulic properties from image. Soil samples were taken from a site located at the Baltimore science center, which is located inside of the city. Undisturbed columns were taken from the site and scanned with a computer tomographer at resolutions of 22 μm. Pore networks were extracted by medial-axis transformation and were used to measure pore geometry from one of the scanned samples. Water retention and unsaturated hydraulic conductivity values were calculated from the soil image. Properties of soil bulk density, water retention and unsaturated hydraulic conductivity were measured from three replicates of scanned soil samples. 3D image analysis provided accurate detailed pore properties such as individual pore volumes, pore length, and tortuosity of all pores. These data made possible to calculate accurate estimations of water retention and hydraulic conductivity. Combination of the calculated and measured hydraulic properties gave more accurate information on pore sizes over wider range than measured or calculated data alone. We could conclude that the hydraulic property computed from soil images and laboratory measurements can describe a full structure of intra- and inter-aggregate pores in soil.
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Hyen Chung Chun,Sanghun Lee,Dong Hyeok Gong,Young Dae Choi,Ki Yuol Jung 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4
Accurate and optimal water supply to crop is critical in growing stalks and producing maximum yields. Adzuki bean is one of the representative legume crops and known as a vulnerable crop to water stress. This study investigated drought effect on adzuki bean at various growth stages and water use efficiency (WUE) with different soil moisture contents in order to evaluate response of adzuki bean to drought. The experiment was performed at National Institute of Crop Science in Miryang. Adzuki beans were planted in a Wagner pot filled with 50% of silt loam soil and 50% of bed soil. Drought treatment was applied at six growth stages: V1, V3, V5, R1, R3, R5. Another pot experiment was performed in a stainless steel pot with an automated irrigation system in order to maintain targeted soil moisture content (40, 60 and 80% of field capacity). Growth and yield characteristics of adzuki bean were measured from all pots. Crop susceptibility (CS) was calculated from the Wagner pots to quantify drought effect at each growth stage and WUE was measured from the stainless pots to determine the least water requirement to prevent drought damage. Drought effect was the greatest in growth reduction at V1 and yield reduction at R3. CS value was the smallest value at V3 and the greatest at R3. Growth, yield and WUE data of adzuki bean were not different between soil moisture 60% of field capacity and 80%, while ones from 40% soil moisture content were smaller than others. Adzuki bean exhibited great vulnerability to drought stress at reproductive stage and it required at least soil moisture 60% of field capacity to prevent drought damage. These results will be useful to water management of adzuki bean and prevent drought damage in adzuki bean cultivation.
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