Food Supply and the Nitrogen Cycle in Japan.
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概要
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The food supply system in Japan was investigated from the concept of nitrogen balance. It is estimated that the amount of nitrogen fixed naturally in arable land in Japan is 1.5x10<SUP>5</SUP> ton year<SUP>-1</SUP>. The amount of nitrogen in industrial fertilizer, in catch of fish and in imported food or feed were 6.1x10<SUP>5</SUP> and 2.6x10<SUP>5</SUP> and 8.3x10<SUP>5</SUP> ton year<SUP>-1</SUP> respectively in 1992. The nitrogen accompanied with the food supply system that provides sufficient food to 1.2x10<SUP>8</SUP> people changes the natural nitrogen cycle and this is the cause of eutrophication in bays and lakes in Japan. It is necessary to use excreta from man for manure and to import meat instead of chemical fertilizer and feed imports in order to construct the society that does not disturb the natural nitrogen cycle.
- 社団法人 環境科学会の論文
社団法人 環境科学会 | 論文
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