Experimental Reflections Influence of Percolation Pattern on the Removal of Soluble Elements in Stratified Paddy Field with Rice and Alluvial Soil.
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Accession number;03A0178540
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| Title;Experimental Reflections Influence of Percolation Pattern on the Removal of Soluble Elements in Stratified Paddy Field with Rice and Alluvial Soil. |
| Author;
SASAKI CHOICHI
(Hirosaki Univ., Faculty of Agriculture and Life Sci., JPN)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.223;PAGE.19-27(2003)
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| Figure&Table&Reference;FIG.3, TBL.3, REF.20 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;The dynamics of substances in percolating water were investigated using paddy field models which were planted with rice and fertilized. Percolation patterns of both plow layer and plow sole were set up in these models for closed system percolation. In one of these models, in which the groundwater level was high, the percolation pattern of the subsoil layer was set up as closed system percolation. In another model, in which the groundwater level was low, it was set up as open system percolation in the part above groundwater level, and as closed system percolation in the part below groundwater level. The results were that concentrations of nitrate nitrogen and nitrite nitrogen in downstream water were higher in the upper part of the subsoil layer with open system percolation than in both the plow layer and plow sole with closed system percolation, whereas they tended to be lower in the lower part of the subsoil layer with closed system percolation than in both those layers. Concentrations of iron and manganese in the subsoil became higher in the part with closed system percolation than in that with open system percolation. Bases such as that of calcium tended to rise in their concentrations, being affected by the increase of iron consentration in the soil water. (author abst.) |
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