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Title: Effects of cyclic irrigation on water and nitrogen mass balances in a paddy field
Authors: Hama, Takehide  kyouindb  KAKEN_id
Nakamura, Kimihito  kyouindb  KAKEN_id  orcid (unconfirmed)
Kawashima, Shigeto  kyouindb  KAKEN_id
Kaneki, Ryoichi
Mitsuno, Toru
Author's alias: 濱, 武英
Keywords: Nitrogen
Cyclic irrigation
Water reuse
Paddy field
Issue Date: Oct-2011
Publisher: Elsevier B.V.
Journal title: Ecological Engineering
Volume: 37
Issue: 10
Start page: 1563
End page: 1566
Abstract: Cyclic irrigation is considered an effective water management practice for reducing pollutant loads from a paddy-field district. The objective of this study was to clarify the effects of cyclic irrigation on mass balance in paddy plots. At the study site, cyclic irrigation with a high cyclic irrigation ratio (% reused water in irrigation water) was conducted from late April to late June. We found a complementary relationship between the volume of irrigation water and rainfall, which together totaled about 1400–1600 mm during the irrigation period each year. We concluded that a cyclic irrigation system that enables the paddy-field district to use a high cyclic irrigation ratio may lead to more efficient use of rainfall for crop irrigation. Nitrogen concentrations in both irrigation water and ponded water tended to be higher during the cyclic irrigation period than during the lake water irrigation period. Nitrogen input from irrigated water accounted for about 8–16% of the total input of nitrogen. It is suggested that fertilizer application of nitrogen can be reduced by its return through cyclic irrigation.
Rights: © 2011 Elsevier B.V.
This is not the published version. Please cite only the published version.
DOI(Published Version): 10.1016/j.ecoleng.2011.03.032
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