WATER QUALITY IN STREAMS FROM THE AREA OF A HIGH PIG STOCKING DENSITY IN JAPAN
The effects of land use and livestock, on the water quality were studied at the high pig stocking density area at Aomori Prefecture in Japan. The relationships between total nitrogen concentration in the stream water and the percentage of land area used as paddy fields, forest and upland fields were researched. Changes of water quality were investigated during the period December 1997 until November 1998. Water pollution in the livestock breeding area was caused by an anaerobic lagoon at the pig farm. Clearly high concentrations and a specific load of total nitrogen and total phosphorus were observed at the pig farm area. Specific load of total nitrogen and total phosphorus increased with rainfall during July and September and after the snow thaw in March.
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Document Type: Research Article
Publication date: 2000-01-01
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