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タイトル: | Effectiveness of cyclic irrigation in reducing suspended solids load from a paddy-field district |
著者: | Hama, Takehide Nakamura, Kimihito https://orcid.org/0000-0003-4357-7187 (unconfirmed) Kawashima, Shigeto |
著者名の別形: | 濱, 武英 |
キーワード: | Cyclic irrigation Paddy fields Suspended solids Water reuse |
発行日: | Mar-2010 |
出版者: | Elsevier |
誌名: | Agricultural Water Management |
巻: | 97 |
号: | 3 |
開始ページ: | 483 |
終了ページ: | 489 |
抄録: | The reduction of suspended solids, nutrients, and organic matter loads in drainage water from paddy fields is an important issue for water quality management in closed water areas in Japan. We evaluated the ability of cyclic irrigation to reduce the suspended solids load from paddy fields. In 2006 and 2007, we investigated water and mass balances during the irrigation period in a low-lying paddy-field district neighboring Lake Biwa, which is the largest lake in Japan. We confirmed that cyclic irrigation reduced effluent loads during the puddling season. With cyclic irrigation, 118 kg ha−1 of suspended solids was returned to the paddy fields in 2006 and 199 kg ha−1 in 2007. The effect of cyclic irrigation on the net suspended solids load can be represented by three ratios: the concentration ratio, which represents the ratio of the suspended solids concentration in drainage water to that in lake water; the cyclic irrigation ratio, which represents the ratio of the volume of reused water to that of irrigation water in cyclic irrigation; and the surplus irrigation water ratio, which represents the ratio of the volume of surplus irrigation water to that of irrigation water. The cyclic irrigation ratio and the surplus irrigation water ratio interact to determine the effect of cyclic irrigation on the net suspended solids load. Simultaneously increasing the cyclic irrigation ratio and decreasing the surplus irrigation water ratio will maximize the purification effect on drainage water from paddy fields. |
著作権等: | c 2009 Elsevier B.V. All rights reserved. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/91252 |
DOI(出版社版): | 10.1016/j.agwat.2009.11.007 |
出現コレクション: | 学術雑誌掲載論文等 |
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