| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2010: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Research Abstract |
Salt origins of agricultural drainage water samples can be analyzed by the 87Sr/86Sr isotope ratio and chemical composition. Plots of 87Sr/86Sr vs. 1/Sr suggested that the origin of salt in drain water were irrigation water, fertilizer and fossil seawater, and analysis of a mixing model incorporating these three end-components showed that the origins of Sr in drainage differed markedly between summer and winter. Origins of sodium and calcium of the drain water were also tested using 87Sr/86Sr and Na/Sr and Ca/Sr as tracers. While quantitative analysis has been in process, environmental dynamics of sodium and calcium could be interpreted by result of strontium isotope analysis using plots of those tracers.
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