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Sung Un Kim(김성은),Dong-Cheol Seo(서동철),Taek-Keun Oh(오택근),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Previously developed ammonia (NH₃) emission factor in Korea has many drawbacks including poor spatial, measurement period, fertilizer management and high uncertainty. Here we present the new NH₃ emission factor to establish the NH₃ inventory that contains higher resolution in terms of spatial distribution, measurement period, fertilization management and includes more accurate activity levels. Field plots were established at three different locations in Miryang, Jinju and Daejeon from 2020 to 2021. Spring Chinese cabbage was grown for 65 days from April to June each year. Urea was applied at the rates of 0, 160, 320 and 640 kg N ha<SUP>-1</SUP>. Ammonia gas was collected for 80 days using static chambers. Daily NH₃ flux mainly affected by soil water filled pore space (WFPS) and the emission generally peaked after urea application at the above 40% of WFPS at all locations. Daily NH₃ fluxes were significantly correlated with WFPS. The cumulative NH₃ emissions increased with increasing application rate of urea in both years. There was a significant positive relationship between ammonium concentration in soil and cumulative NH₃ emission. Averaged NH₃ emission factor across locations increased over two-year from 0.086 kg NH₃-N kg<SUP>-1</SUP> N in 2020 to 0.167 kg NH₃-N kg<SUP>-1</SUP> N in 2021 and averaged NH₃ emission factors was 0.126 kg NH₃-N kg<SUP>-1</SUP>. This difference of NH₃ emission factors between years might successive urea application. New emission factor in this study was lower than previously published ammonia emission factor (0.141 NH₃-N kg<SUP>-1</SUP> N).
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.
중금속 오염 농경지 토양에서 바닥재 시용에 의한 카드뮴 식물이용성 저감효과
김성은 ( Sung Un Kim ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-
Since bottom ash (BA) contains considerable amounts of CaO and MgO, it could be a useful amendment to increase soil pH and to immobilize cadmium (Cd). This study was conducted to evaluated effect of application of BA to reduce Cd phytoavailability. Bottom ash was applied at the rate of 0, 20, 40, and 80 Mg/ha to Cd contaminated soil, and then lettuce was cultivated under field condition. soil pH and net negative charge increased slightly with increasing BA application; however, there was no statistical difference among the rates. Water soluble, exchangeable+acidic, reducible, and oxidizable fraction of Cd decreased with increasing bottom ash application rate whereas, residual fraction of Cd increased with increasing bottom ash application rate. Lettuce yield increased with rate of bottom ash up to 40 kg/ha and there was no visual evidence of cadmium toxicity and growth inhibition during lettuce cultivation. Bottom ash was effective to reduce phytoextractability of Cd and increase lettuce yield. Conclusively, BA could be a good soil amendment to reduce Cd phytoavailability in contaminated arable soil.
03 구두발표 : 구두발표(OA) - 농업환경 및 토양,수질 분야 ; OA-01 : 질소공급원으로써 요소와 큐라클로버를 이용한 프래어리코드 그라스의 바이오매스 생산
김성은 ( Sung Un Kim ),밴스오언스 ( Vance Owens ),케네스알버트 ( Kenneth Albrecht ),크레이그쉐퍼 ( Craig Sheaffer ),이도경 ( Do Kyoung Lee ),센틸슈브라메니언 ( Sen Subramanian ),홍창오 ( Chang Oh Hong ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Optimizing N input and proper N management is an important factor for establishing perennial biomass production systems. However, application of nitrogen (N) fertilizer can be one of the greatest expenses, from both a financial and environmental perspective. The objectives of this study were to determine if different nitrogen rates and planting spacing affected prairie cordgrass (Spartinapectinata Link) biomass yield and yield components in prairie cordgrass monoculture, and N fertilizer replacement value of kura clover (Trifoliumambiguum Bieb.) in prairie cordgrass and kura clover mixture compared to monoculture prairie cordgrass. Field plots were established at four environments in Illinois, Minnesota, South Dakota, and Wisconsin in 2010. Kura clover was transplanted on 30-cm centers in the field in all treatments in which it was a component. Prairie cordgrass seedlings were transplanted within the kura clover on 60, and 90-cm centers. Monoculture prairie cordgrass stands were established at the same population densities of mixed stands and fertilized with 0, 75, 150, or 225 kg urea N ha-1 to determine fertilizer N replacement value of the kura clover. Biomass at each location was harvested in the autumn from 2011 to 2013. N (urea), year, spacing and year x spacing affected prairie cordgrass production at all locations. Prairie cordgrass yield was increased with N application, and yield responses varied by location. Tiller density m-2 of prairie cordgrass tended to increase as N application increased and urea N fertilization affected PCG tiller mass. Yield of prairie cordgrass with 0 N were equal to or less than the yield of prairie cordgrass grown with kura clover at all locations in 2011 and 2012; however, there was a N value associated with prairie cordgrass grown with kura clover in 2013 and fertilizer nitrogen replacement value of kura clover ranged varied by location.