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Accession number;07A0024748
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| Title;Removal of Nitrate Originating from Spring Water due to Denitrification Function of Paddy Soils around Nakayama Valley Located in the Central South Region of Kasanohara Shirasu Plateau in Kagoshima Prefecture |
| Author;
MATSUMOTO JUN
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
MOCHIDA TOSHIYUKI
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
FURUE KOJI
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
UEZONO ICHIRO
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
NAGATOMO MAKOTO
(Kagoshima Prefect. Agric. Exp. Stn., JPN)
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Journal Title;Kagoshimaken Nogyo Shikenjo Kenkyu Hokoku
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Journal Code:Y0103A
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ISSN:0388-8215
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VOL.;NO.33;PAGE.57-62(2005)
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| Figure&Table&Reference;FIG.5, TBL.4, REF.12 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Water pollution by nitrate occurs on springs around Nakayama valley located in the central south region of Kasanohara Shirasu plateau. It is the purpose whether purification by using denitrification function of paddy soils is possible or not as a countermeasure for the water quality conservation. In the field experiment, the irrigation water containing nitrate of 10mg L'-1' was supplied during the growing period, and the amounts of nitrogen absorped by rice and lost due to denitrification were evaluated. The obtained results were as follows: 1) Denitrification function of the paddy field was found to be sufficiently great, and in addition the dilution effect due to mixing of the ground or river water containing lower concentration of nitrate was also high. It was suggested that a geographical chain of upland and paddy fields was effective as a purification countermeasure of nitrate originating from fertilization to upland fields and waste of animal husbandary. 2) When nitrate solution containing 10mgN L'-1' was supplied to paddy rice during the growing season on the Shirasu paddy field through the irrigation, 56% of nitrogen supplied as the irrigation water was lost as gas by denitrification, and 21% was absorbed by rice plants; it gave the good result that 77% of nitrate was removed in total. (author abst.) |
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