| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Research Abstract |
Hokota river basin is a nitrogen pollutant area. We set nitrogen purification paddy fields. We used data in 2010 and 2011 applicable to analysis this time for comparison.
The inlet TN concentration of paddy fields from 9.8 mg-L-1 to 16.0 mg-L-1. Inlet TN load was from 0.488 g・m-2・day-1 to 4.703 g・m-2・day-1. The balance TN load was from-555.9 kg・ha-1 to-1,837.8 kg・ha-1.
All the paddy fields were nitrogen purification type paddy fields. This result showed that these paddy fields could play a large role in the nitrogen load reduction effect. As a result of considering the influence which it has on this nitrogen removal effect, it became clear that the factor which has biggest influence was inflow nitrogen loads. The inflow nitrogen loads and the balance loads were proportionality relation. R2 value showed the high value of 0.9185.
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