WEKO3
アイテム
既存の暗渠を活用した地下水位制御による粘土質転換畑からの窒素負荷削減
https://doi.org/10.24514/0002001666
https://doi.org/10.24514/000200166669d41080-0ed5-4f37-948d-57cdf5e31abd
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
TRNIREJ214_17-24.pdf (2.5 MB)
|
(c) 国立研究開発法人 農業・食品産業技術総合研究機構
National Agriculture and Food Research Organization, Japan |
| Item type | 紀要論文 / Departmental Bulletin Paper_03(1) | |||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2026-01-13 | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| タイトル | 既存の暗渠を活用した地下水位制御による粘土質転換畑からの窒素負荷削減 | |||||||||||||||||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||||||||||||||||
| タイトル | ||||||||||||||||||||||||||||||||||||||
| タイトル | Effects of Controlled Drainage on Nitrogen Losses in a Clayey Agricultural Field with Cracks | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 言語 | ||||||||||||||||||||||||||||||||||||||
| 言語 | jpn | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | ||||||||||||||||||||||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||||||||||||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||||||||||||||||||||||||||||
| ID登録 | ||||||||||||||||||||||||||||||||||||||
| ID登録 | 10.24514/0002001666 | |||||||||||||||||||||||||||||||||||||
| ID登録タイプ | JaLC | |||||||||||||||||||||||||||||||||||||
| 著者 |
宮本, 輝仁
× 宮本, 輝仁
× 北川, 巌
× 塩野, 隆弘
× 亀山, 幸司
|
|||||||||||||||||||||||||||||||||||||
| 抄録 | ||||||||||||||||||||||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||||||||||||||||||||||
| 内容記述 | Paddy fields are often used for upland crop cultivation in intensive agricultural production in Japan. To maintain high crop yields and groundwater and surface water quality in drained agricultural lands, management practices which reduce the leaching of nitrate-nitrogen （NO3-N） into subsurface drainage systems are required. Controlled drainage has been identified as a potential management method to reduce NO3-N leaching into subsurface drainage systems. Therefore, this study aimed to evaluate the effects of controlled drainage on NO3-N leaching in clayey soil with cracks. The relationship between drain discharge quality and soil-water residence time was investigated using a model soil layer with cracks. For free outlet subsurface drainage, preferential water flow in cracks was predominant. Therefore, the NO3-N drainage concentration quickly reached 80％ of the supplied NO3-N solution concentration. In contrast, controlled drainage had a significant effect on the drain discharge quality. The longer the residence time of soil water, the larger was the reduction rate of NO3-N. For a residence time of 7 days, the reduction rate was 90％. In 2011 and 2012, a field experiment was conducted on clayey soil on a field scale to assess the effects of controlled drainage on NO3-N leaching. Controlled drainage makes it possible to conveniently vary the water table levels by attaching a riser to the drain pipe. There were 1/2-1/100 reductions of NO3-N concentration in the drain flow in controlled drainage as compared with free outlet subsurface drainage. The reduction rate was dependent on rainfall and farming conditions. The amounts of NO3-N leaching from early July 2012 to the middle of August 2012 for the controlled drainage site and free outlet subsurface drainage site were 0.4kg/10a and 1.2kg/10a, respectively. By raising the water table, more soil will be in a saturated state, producing anaerobic conditions which promote denitrification. In addition, evaporation from the soil surface will increase and outflow volume will decrease. These results show that there are significant environmental benefits with controlled drainage. |
|||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| 書誌情報 |
ja : 農村工学研究所技報 en : Technical report of the National Institute for Rural Engineering 巻 214, p. 17-24, 発行日 2013-03-28 |
|||||||||||||||||||||||||||||||||||||
| 出版者 | ||||||||||||||||||||||||||||||||||||||
| 出版者 | 独立行政法人 農業・食品産業技術総合研究機構 農村工学研究所 | |||||||||||||||||||||||||||||||||||||
| 言語 | ja | |||||||||||||||||||||||||||||||||||||
| 出版者 | ||||||||||||||||||||||||||||||||||||||
| 出版者 | National Agriculture and Food Research Organization, National Institute for Rural Engineering | |||||||||||||||||||||||||||||||||||||
| 言語 | en | |||||||||||||||||||||||||||||||||||||
| ISSN | ||||||||||||||||||||||||||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||||||||||||||||||||||||||
| 収録物識別子 | 1882-3289 | |||||||||||||||||||||||||||||||||||||
