| Project/Area Number |
18580330
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Boundary agriculture
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| Research Institution | Kyushu University |
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Principal Investigator |
KUROSAWA Kiyoshi Kyushu University, 熱帯農学研究センター, 教授 (70128114)
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| Co-Investigator(Kenkyū-buntansha) |
EGASHIRA Kazuhiko 九州大学, 大学院・農学研究院, 教授 (20038293)
FUKUDA Shinji 九州大学, 熱帯農学研究センター, 助教 (70437771)
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| Project Period (FY) |
2006 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,060,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥660,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2006: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | アンモニウム態窒素 / 化学肥料 / 還元溶出 / 紅河デルタ / 水質基準 / 地下水 / 窒素同位体比 / ヒ素 / 国際研究者交流 / ベトナム / 窒素化学肥料 / 時空間的変動 / 酸化還元電位 / 堆積物 |
|---|
| Research Abstract |
The arsenic concentration (μg/L) of groundwater in the farming villages of southern Hanoi city, Vietnam was a high of 150 at maximum with an average of 40. The arsenic in groundwater was found to occur by the reductive release of arsenic from sediments to groundwater. Nitrogen fertilizer produced ammonium-N in groundwater. Where the arsenic concentration was high, the ammonium-N concentration was high and oxidation-reduction potential was low in groundwater, thus the contribution of nitrogen fertilizer to the groundwater arsenic contamination was recognized. Contribution of phosphate fertilizer to the groundwater arsenic contamination was identified to be small.
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