1993 Fiscal Year Final Research Report Summary
Correlation between the Water Cycle and the Water Quality Change in the Area of Paddy Fields
| Project/Area Number |
04660250
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
農業土木
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| Research Institution | NIIGATA UNIVERSITY |
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Principal Investigator |
TOYOTA Masaru Niigata Univ., Fac.of Agric., Professor, 農学部, 教授 (50018785)
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| Co-Investigator(Kenkyū-buntansha) |
MISAWA Shinichi Niigata Univ., Fac.of Agric., Associate Prof., 農学部, 助教授 (30018791)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Water cycle / Water management / Water reuse / Effluent load / Water quality |
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| Research Abstract |
From both the 1992 and the 1993 investigations, the following results were obtained :
1. Through the use of water cycling, the complex tank model with water reuse included could indicate the return rate of irrigation water.
2. The concepts of paddy water purification and the water pollution mechanisms were understood. When the irrigation water is polluted, then the paddy water purification mechanism works very well. However, when the irrigation water is clean, then the concentration of the drainage water is increased, proving what is known as the buffer effect of paddy fields.
3. Water use was very effective in the farm-pond area using pumped irrigation water, moreover, the water cycling area using implying drainage channels supply reuse water was much more effective.
4.The area with plenty of irrigation water has less labor requirement and the water quality concentrations are lower, but the loads are large and so the drainage output loads are very large. Through the use of water cycling methods, the concentration of irrigation water increases, but with good water management methods it is possible to distribute the irrigation water more uniformly among the users, with less effluent loads and reduced environmental effects.
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