2011 Fiscal Year Final Research Report
The study of factor analysis of improvement for nitrogen purification capacity using paddy fields
| Project/Area Number |
21580291
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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 |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Ibaraki University |
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Principal Investigator |
KURODA Hisao 茨城大学, 農学部, 教授 (20205256)
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| Co-Investigator(Kenkyū-buntansha) |
KATO Tasuku 東京農工大学, 農学研究院, 准教授 (10302332)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 窒素 / 浄化 / 面源 / 水田 / 田面効率 |
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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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