期刊
ECOLOGICAL ENGINEERING
卷 37, 期 10, 页码 1563-1566出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2011.03.032
关键词
Nitrogen; Cyclic irrigation; Water reuse; Paddy field
资金
- Kinki Regional Agricultural Administration Office of the Japanese Ministry of Agriculture, Forestry and Fisheries
- Japan Society for the Promotion of Science
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. (C) 2011 Elsevier B.V. All rights reserved.
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