集団茶園系のノンポイントソースによる硝酸負荷の実態 : 静岡県牧之原台地における事例

概要

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The authors measured the nitrate concentration of river water from a catchment basin of the collective tea fields in the Makinohara plateau in Shizuoka prefecture, from June 2002 to May 2003. About 1,000 kg · ha-1 · y-1 of nitrogen fertilizer has been used in the tea fields for about 30 years. The annual average NO3-N concentration and pH were 24.4 mg · l-1 and 4.9, respectively. NO3-N concentration decreased as a result of a comparatively small amount of precipitation, and repeated. The total annual nitrogen outtlow from the tea fields was 428 kg · ha-1 · y-1. The ratio of nitrogen load to the amount of applied nitrogen fertilizer was 79.2 %. NO3-N load was affected by discharge from the tea fields.
社団法人　日本水環境学会の論文
2006-11-10