| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
A model was developed for nitrate nitrogen release from rice paddy fields to the Oita River induced by raindrop impact pressure in the basin. The nitrate nitrogen release rate in the paddy fields is expressed as a function of rainfall intensity. The field measurements at Funai in the river show that nitrate nitrogen concentrations for dry weather were not much different from those for wet weather. Whereas, nitrate nitrogen loadings for wet weather were 3 to 12 times larger than those for dry weather. The modeled dependence of unit nitrate nitrogen release on the rainfall intensity agrees fairly well with observed data, validating the model.
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