Downloads: 362

Files in This Item:
File Description SizeFormat 
j.agwat.2009.11.007.pdf218.45 kBAdobe PDFView/Open
Title: Effectiveness of cyclic irrigation in reducing suspended solids load from a paddy-field district
Authors: Hama, Takehide  kyouindb  KAKEN_id
Nakamura, Kimihito  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-4357-7187 (unconfirmed)
Kawashima, Shigeto  kyouindb  KAKEN_id
Author's alias: 濱, 武英
Keywords: Cyclic irrigation
Paddy fields
Suspended solids
Water reuse
Issue Date: Mar-2010
Publisher: Elsevier
Journal title: Agricultural Water Management
Volume: 97
Issue: 3
Start page: 483
End page: 489
Abstract: 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.
Rights: c 2009 Elsevier B.V. All rights reserved.
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。
This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/91252
DOI(Published Version): 10.1016/j.agwat.2009.11.007
Appears in Collections:Journal Articles

Show full item record

Export to RefWorks


Export Format: 


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.