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04 포스터 발표 : 토양 환경 분야(PS) ; PS-04 : 농경지 토양에서 비소의 식물이용성에 관한 칼슘 제제들의 효과
노용동 ( Yong Dong Noh ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Some studies reported that lime additions to arsenic(As)-containing soils have been proven to reduce the mobility of As though the precipitation of various forms of calcium arsenate mineral. However, little information is available for phytoavailability of As by calcium (Ca) in arsenic contaminated arable soil. The objectives of this study was to determine effect of calcium materials on immobilization of arsenic and uptake of this metalloid to radish (Raphanus sativa L.) in arable soil. Two calcium materials (CaCO3 and CaSO4) were selected and applied at the rate of 0, 2, 4 and 8 Mg ha-1 to an arable soil with 25 mg kg-1 of As. Soil pH increased with CaCO3 application but decreased with CaSO4. Water soluble As and it’s uptake to radish significantly decreased with increasing application rate of both Ca materials. However, CaSO4 was more effective to reduce phytoextractability of As than CaCO3.
토양환경 분야PS-03 : 밭토양에서 소석회와 패화석에 의한 카드뮴 부동화 효과의 비교
노용동 ( Yong Dong Noh ),김필주 ( Pil Joo Kim ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2014 한국환경농학회 학술대회집 Vol.2014 No.-
Oyster shell is alkaline with pH 9.8, porous, and has high concentration of CaCO3 (up to ca. 95%). It could be used as an alternative of lime fertilizer to immobilize cadmium (Cd) in heavy metal contaminated arable soil. Therefore, this study has been conducted to improve agricultural utilization of oyster shell as an alternative of lime fertilizer that immobilize Cd in heavy metal contaminated arable soil. To do this, we compared effects of calcium (Ca) materials [Ca(OH)2 and oyster shell] on Cd extractability in upland soil and determined mechanisms of Cd immobilization with both Ca materials. Both Ca materials were added at the rates of 0, 0,1, 0.2, 0.4 and 0.8% (wt Ca wt-1) in Cd contaminated upland soil that contained total 6.5 mg Cd kg-1, and the mixtures of soil and Ca material were incubated at 25℃ for 4 weeks. Both Ca materials increased pH and net negative charge with increasing Ca addition and decreased 1 N NH4OAc extractable Cd concentration. 0.1 N HCl extractable Cd concentration markedly decreased with addition of oyster shell but not with Ca(OH)2. 1 N NH4OAc extractable Cd concentration was significantly related with pH and net negative charge of soil. However, there were no significant relationships between 0.1 N HCl extractable Cd concentration and pH and net negative charge of soil. From the above results, Cd immobilization with Ca(OH)2 was mainly attributed to Cd adsorption resulted from increase in pH-induced negative charge of soil. Scanning electron microscope (SEM) images and energy dispersive spectroscopy (EDS) analyses were conducted to determine mechanism of Cd immobilization with oyster shell. There was no visible precipitation on surface of both Ca materials. However, Cd was dected in innerlayer of oyster shell by EDS analyses but not in that of Ca(OH)2. Therefore, we concluded that Cd immobilzation with oyster shell was different from that with Ca(OH)2 implying Cd immboilization with oyster shell might be due to precipitation of Cd or other chemical reactions in innerlayer of oyster shell. Further study should be conducted to elucidate the mechanism of Cd immobilization with oyster shell.
04 포스터 발표 : 토양 환경 분야(PS) ; PS-01 : 헤어리베치와 청보리의 단일 및 혼합 환원이 토양 내 질소의 무기화와 옥수수의 수량에 미치는 영향
김성은 ( Sung Un Kim ),노용동 ( Yong Dong Noh ),이현호 ( Hyun Ho Lee ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
In agriculture, green manure is created by leaving uprooted or mown crop parts to wither on a field so that they furnish essential plant nutrients to subsequent crops. Crop yield can be maintained by replacing or supplementing nitregen (N) fertilizer with residue N from cover crops. However, Effective cover crop nutrient contribution to soil properties depends upon amount, type, size, and dominant component of the added organic materials. The objective of this study was to find out countermeasure to maximize nutrient use efficiency of main crop with single and mixture incorporation of green manures in the soil. Therefore, we 1) evaluate N availability and the changes of inorganic N during corn growing period and 2) determine green manure effect on subsequent crop yield. Hairy vetch (V100%) and barley(B100%) monoculture or hairy vetch-barley mixtures (H50%B50%) were seeded, grown for winter season, and incorporated at 4-, 2-, and 0- week ahead corn planting date. Concentration of N (g/kg) in cover crops regardless of culture and crop type decreased when closer to corn planting date, while amount of total N input (kg/ha) to the soil increased. Soil inorganic N concentration of 0-week ahead corn planting date was highest at initial growing stage and concentration of soil inorganic N was decreased sharply during corn growing period. Grain yield of corn was the highest in the 0 week ahead the corn plating date.
유류오염 토양 내 석유계 탄화수소 화합물의 분해에 대한 퇴비의 시용 효과
김성은 ( Sung Un Kim ),김용균 ( Yong Gyun Kim ),이상몽 ( Sang Mong Lee ),박현철 ( Hyean Cheal Park ),김근기 ( Keun Ki Kim ),손홍주 ( Hong Joo Son ),노용동 ( Yong Dong Noh ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2015 한국환경농학회지 Vol.34 No.4
BACKGROUND: Petroleum-contaminated soil from leaking above- and underground storage tanks and spillage during transport of petroleum products is widespread environmental problem in recent years. Application of compost may be the most promising, cost-effective, and eco-friendly technology for soil bioremediation because of its advantages over physical and chemical technology. The objective of this study was to evaluate effect of compost application on degradation of total petroleum hydrocarbon (TPH) in petroleum hydrocarbon-contaminated soil.METHOD AND RESULTS: An arable soil was artificially contaminated by diesel, and compost was applied at the different rate of 0, 10, 30, and 50 Mg/ha. Concentration of TPH in the soil decreased as application rate of compost increased. Degradation efficiency was highest at compost 30 Mg/ha; however, it slightly decreased with compost 50 Mg/ha. Kinetic modeling was performed to estimate the rates of chemical reaction. The correlation coefficient (R2) values for the linear plots using the second-order model were higher than those using the first-oder model. Compost 30 and 50 Mg/ha had the fastest TPH degradation rate in the second-order model. Change of microbial population in soil with compost application was similar to that of TPH.Microbial population in the soil increased as application rate of compost increased. Increasing microbial population in the contaminated soil corresponded to decreased in TPH concentration.CONCLUSION: Conclusively, compost application for soil bioremediation could be an effective response to petroleum hydrocarbon-contaminated soil. The increase in microbial population with compost suggested that compost application at an optimum rate might enhance degradation of TPH in soil.