Chapter
Apr 26, 2012
Relationship between Farming Activities and Water Quality Variations of Drainage Water from Paddy Fields Area
Authors: Hiroaki Somura [email protected], Ikuo Takeda [email protected], and Yasushi Mori [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2008: Ahupua'A
Abstract
We paid attention to relationship between farming activities and changes in drainage water quality from a paddy fields area, especially in land preparation period for transplanting of paddy. Drainage water quality during land preparation period became highest concentration of all items through a year. In 2006, average water qualities in the period were 7.9 mg/L in T-N, 1.6 mg/L in T-P, 15.3 mg/L in TOC, and 372 mg/L in SS. In addition, maximum values in the period were 36.2 mg/L in T-N, 12.3 mg/L in T-P, 83.2 mg/L in TOC, and 3020 mg/L in SS. The changes in water quality moved on with land preparation by tractor and drainage gate operation on each paddy field by farmers. Moreover, relatively high concentrations of drainage water were also observed during non-irrigation period. As no agricultural activities were done during the period, it is considered that residual nutrient in soil will infiltrate by rain water and flow to the drainage channel.
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© 2008 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Agriculture
- Drainage
- Environmental engineering
- Gates (hydraulic)
- Geomechanics
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic structures
- Irrigation engineering
- Irrigation water
- Residual soils
- Soil mechanics
- Soil properties
- Soil water
- Soils (by type)
- Water (by type)
- Water and water resources
- Water management
- Water quality
- Water treatment
Authors
Affiliations
Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan. E-mail: [email protected]
Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan. E-mail: [email protected]
Faculty of Life and Environmental Science, Shimane University, Matsue 690-8504, Japan. E-mail: [email protected]
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