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RISS 인기검색어
- 검색키워드
- 저자 : Joung-Du Shin(愼重斗) (검색결과 96 건)
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미나리 ( Oenanthe stolonifera DC . ) 를 이용한 Bentazon 의 생물학적 분해
신중두,이명선 ( Joung Du Shin,Myung Sun Lee ) 한국환경농학회 1997 한국환경농학회지 Vol.16 No.3
Laboratory experiments were conducted to the potential ability of bioremediation with bentazon such as determining the absorption, translocation, and metabolism of ^(14)C-bentazon in minari after foliar applications. The absorption and translocation of ^(14)C-bentazon were compared when applied to foliar of minari. In foliar applications, 21% was observed in treated leaves, 66% remained in water extracts of leaf surfaces, and 13% was found in the epicuticular wax layer after 2d. Translocation of the herbicide from treated leaves to roots was very low(79 to 9%). Analysis of methanol-soluble extracts of ^(14)C indicated that more than 60% of the foliarapplied herbicide was metabolized in all plant sections after 2d. However, 77% or more of the bentazon was degraded in roots and shoots 2d after root absorption. The major metabolite in these experiments was an unknown compound that was less polar than bentazon and 6- and 8-hydroxy bentazon.
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Nitrogen Mineralization and Nitrification of Selected Piedmont Soils in North Carolina
신중두,Shin, Joung-Du,Reddy, G.B. 한국토양비료학회 1997 한국토양비료학회지 Vol.30 No.1
토양에서 질소변화과정에 관한 보다나은 이해력 증진은 질소비료의 효용성을 증대시키기 위한 필수적 요인이다. 실험실 실험은 대표적인 Piedmont토양에 있어 질소무기화 및 질산화작용을 구명하기 위해 수행하였다. 질소무기화 및 질산화 량은 Enon, Mecklenburg, Chewcla토양의 표토층에서 60 일까지 증가되었으며, 그후로부터 90일까지는 감소하는 경향을 보였다. 그러나 Wehadkee토양에서 질소의 무기화 및 질산화 량은 숙성시간에 따라 차이가 없었다. 위에서 열거한 모든 토양의 토심이 15-30cm의 토층에서 질소무기화 및 질산화 량은 90 일까지 시간이 경과함에 따라 증가하였다. 토양에 있어 질소무기화 및 질산화 량은 토심별로 토양종류에 따라 다르게 나타났으며, 이러한 차이점은 토양통풍 및 질산화 bacteria의 수에 영향을 받은 것으로 사료된다. 전반적으로, 질소의 무기화 및 질산화 량은 subsurface lagers보다는 표토층에서 많은 것으로 나타났다. A better understanding of nitrogen transformations in soils is essential to increase fertilizer nitrogen use efficiency. A laboratory incubation study was conducted to determine net mineralization and nitrification in selected Piedmont soils. Net mineralization and nitrification increased up to 60 days in the surface layers of Enon, Mecklenburg and Chewacla. After 60 days both processes declined up to 90 days incubation. In Wehadkee, mineralization and nitrification did not differ with incubation time. In all subsurface layers, mineralization and nitrification increased with time up to 90 days. Mineralization and nitrification differed among soils in surface and subsurface layers. These differences might be influenced by soil type related to amount of mineralization, soil aeration and nitrifying bacterial populations. A mineralization and nitrification was greater in surface layers than in subsurface layers.
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신중두,이종식,김원일,이창은,윤순강,엄기철,Shin, Joung-Du,Lee, Jong-Sik,Kim, Won-Il,Lee, Chang-Eun,Yun, Sun-Gang,Eom, Ki-Cheol Korean Society of Soil Science and Fertilizer 2003 한국토양비료학회지 Vol.36 No.1
벼 재배에 있어 이앙기 가뭄시 대체 용수원을 개발하고자 공장폐수처리장(이하 공장폐수 처리수)와 하수종말처리장 방류수(이하 하수처리수)를 관개한 다음 지하 침투수 수질 및 벼생육 변화를 구명하기 위해 본 시험을 수행하였다. 대체 관개 용수원으로서 공장폐수 처리수의 COD, $NH_4{^+}-N$, $Mn^{2+}$, 및 $Ni^+$ 농도와 하수처리수중의 SS및 $PO_4-P$농도는 여러 국가들의 관개 재활용 수질 기준보다 높은 것으로 나타났다. 하수처리수의 초장은 공장폐수 처리수 10일간 관개구를 제외하고 지하수 관개구 보다 약 2 cm 정도 짧았으나, 지하수 및 하수처리수 관개구의 경수는 관개기간에 관개 없이 유의차가 없는 것으로 나타났다. 그리고 하수처리수 및 공장폐수 처리수 20일 관개구의 수확지수는 유의차가 없었지만, 공장폐수 처리수 30일 관개구의 수확지수는 토성에 관계없이 하수처리수 관개구 보다 약간 높은 것으로 나타났다. 공장폐수 처리수 관개구의 토양 침출수중의 SAR값은 하수처리수 관개구보다 2배 이상 높았지만, 하수처리수 관개구는 지하수 관개구와 비교하여 유의차가 없는 것으로 나타났다. 이앙 30일 후 공장폐수 및 하수종말처리수 관개구의 토양침출수중 평균 전기전도도(EC1) 값은 각각 식양토에서 4.7과 $3.4dS\;m^{-1}$ 그리고 사양토에서 3.5 및 $2.5dS\;m^{-1}$로 나타났다. 전생육 기간 및 토성에 따른 공장폐수 처리수 관개구의 토양 침출수중 $EC_i$값이 하수처리수 관개구 보다 2배 이상 높게 나타났지만, 이앙 30일 후부터 급격히 감소하는 경향을 보였다. 그렇지만 하수종말 처리수 관개구의 토양 침출수 중 $EC_i$ 값은 지하수 관개구와 비교하여 유의차가 없는 것으로 나타났다. 이상의 결과로 보아 벼 재배시 하수종말 처리수는 가뭄으로 인한 농업용수가 부족한 경우 대체수자원으로서 잠정적 활용이 가능한 것으로 생각된다. Objective of this study was to assess rice growth and percolation water salinity under the irrigation of the discharge waters from the municipal wastewater treatment plant and from the industrial wastewater treatment plant as alternative water resources during transplanting season. Three kinds of waters were irrigated; the discharge water from an industrial wastewater treatment plant (DIWT), the discharge water from the municipal wastewater treatment plant (DMWT), and groundwater. Concentrations of $COD_{er}$, $NH_4{^+}_-N$, $Mn^{2+}$, and $Ni^+$ in DIWT, SS content and $PO_4-P$ concentrations in DMWT were higher than those of reuse water criteria of other country for agricultural irrigation. The plant height in the irrigation of DMWT was shorter by 2 cm than the groundwater irrigation except for 10 days irrigation. However, the number of tillerings was not significantly different between DMWT and the groundwater. For the harvest index, there were no significant difference between DMWT and DIWT for 20 days irrigation, but slightly higher in DIWT than that of DMWT for 30 days irrigation regardless of soil types. The salinity of percolation water in the rhizosphere with irrigation of DIWT had more twofold than DMWT, but SAR value from DMWT had no significantly different from the groundwater irrigation. The average $EC_i$ values in the rooting zone irrigated with DIWT and DMWT for 30 days after rice transplanting were 4.7 and $3.4dS\;m^{-1}$ in clay loam soil, and were 3.5 and $2.5dS\;m^{-1}$ in sandy loam soil, respectively. There was dramatic decrease in $EC_i$ value at 30 days after rice transplanting even though $EC_i$ of DIWT had more twofold than DMWT. However, $EC_i$ from DMWT had no significant difference from the groundwater. Therefore, it might be considered that there was limited possibility to irrigate DMWT to overcome drought injury of rice transplanting season in paddy field.
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신중두,Shin, Joung-Du 한국토양비료학회 1997 한국토양비료학회지 Vol.30 No.1
Determination of N mineralization and nitrification potentials of selected Piedmont soils of North Carolina requires a better understanding of the influences of incorporated plant residues. The net N mineralization and nitrification were significantly influenced by the soil types and by plant species. The net N mineralization and nitrification of soils mixed with plant residues were consistently increased with successional incubation periods. The net mineralization and nitrification ranged from $9.77{\mu}g/g$ to $143.80{\mu}g/g$, and from $5.31{\mu}g/g$ to $145.66{\mu}g/g$ during the incubation periods, respectively. The net N mineralization was more influenced by NO3-N than by NH4-N. Overall, the greatest proportions of net N mineralization and nitrification occurred in Chewacla and Wehadkee and lowest in Enon and Mecklenburg. For the plant residues, the net N mineralization and nitrification were observed to be lowest in corn and highest in soybean. In a low-input agricultural systems, soybean may be planted as cover crop which may improve the nitrogen status of selected Piedmont soils of North Carolina. North Caralina의 대표적인 piedmont 토양에 내재하고 있는 질소무기화 및 질산화 과정에 대한 결정은 식물체 잔사 처리로 인한 효과에 관한 이해를 필요로 한다. 질소무기화 및 질산화 과정은 토양종류 및 식물체의 종류에 따라 유의성 있게 영향을 받았다. 식물체 잔사를 처리한 토양의 질소 무기화 및 질산화량은 계속적인 배양 기간에 따라 꾸준히 증가되었으며, 질소무기화 및 질산화량은 배양 기간 동안 각각 $9.77{\mu}g/kg{\sim}143.80{\mu}g/kg$과 $5.31{\mu}g/kg{\sim}145.66{\mu}g/kg$ 이었다. 질소무기화 과정은 $NH_4-N$보다는 $NO_3-N$에 더 영향을 받았다. 전반적으로 가장 많은 질소무기화 및 질산화량은 Chewela와 Wehadkee 토양에서 발생하였으며, Enon과 Mecklenburg 토양에서 낮은 수치로 나타났다. 식물체 잔사 효율은 옥수수 식물체 잔사 처리에서 가장 낮았으며, 콩 식물체 잔사 처리에서 가장 높은 것으로 관측되었다. 저 투입 농업체계에서 콩 식물체의 잔사 처리가 North Caralina의 대표적인 Piedmont의 질소상태를 증진시키는 피복작물로서 유효하다고 사료된다.
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04 포스터 발표 : 토양 환경 분야(PS) ; PS-07 : 옥수수 재배 시 바이오차의 탄소 격리 및 질소순환에 미치는 효과
신중두 ( Joung Du Shin ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-
Objectives of this study were to investigate changes of soil carbon contents and to evaluate N mineralization and nitrification rates in soils cooperated with organic composts and bio-char during 2nd year corn cultivation. For the experiment, the soil texture used in this study was clay loam, and application rates of chemical fertilizer were 480-150-260 kg ha-1(N-P2O5-K2O) as recommended amount after soil test, and biochar application was 0.2% to soil weight. The soil samples were periodically taken at every 15day intervals during corn cultivation periods. The treatments were consisted of cow compost(CC), pig compost(PC), swine digestate from aerobic digestion system(AD), and their bio-char cooperation. TC contents in treatments cooperated with bio-char at harvesting stages were ranged from 0.96% to 1.24%, and its CC applied plot was highest at 1.24%. It was observed that TC contents with biochar treatments were higher than the compost treatment only. Therefore, it was observed to be carbon sequestration into corn field cooperated with biochar. For nitrogen transformation in soil cooperated with organic composts and bio-char, net mineralization rates were dramatically decreased at 44 days after sowing, but nitrification rates were abruptly increased at 73 days after sowing. For N mineralization and nitrification rates, it was shown that there were generally low in the soil cooperated with biochar as compared to the only application plots of different organic composts. Also, it was observed to be highest in the application plot of pig compost manure. Overall, Application of biochar in the cropland could be important role for mitigation of greenhouse gas as well as carbon sequestration.
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