| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
There are few researches on decomposition and transport of nitrogen of the sediment in drainage canals. The objective of this study is to clarify the nitrogen dynamics in paddy fields. In particular, this study focused on organic-state nitrogen, which is the main pool of nitrogen in paddy soil and canal sediments, and clarify the characteristics of decomposition and release. Nitrogen dynamics were clarified by investigation in the field and experiments in the laboratory. Three study sites were located around Lake Biwa. It was concluded that the canal sediments in the paddy fields had high concentration of nitrogen and the decomposition and release of organic nitrogen could determine the nitrogen concentration in the drainage water during non-rainy days.
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