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Nitrogen cycles in food and feed systems on global, national, local and land-use unit scales were analyzed using data bases on each scale. The results show that he whole land of Japan has been enormously loaded with nitrogen because of the import of a large amounts of food and feed for recent hree decades. The situation isalso recognized in local scales. We have to realize the new balanced system of nutrient cycling by learning from the old agricultural system of Japan. The necessary conditions are as follows: 1) the self-sufficient ratio f food and feed should be increased; 2) construction of toxicant-free s werage systems hould be realized; 3) new organic fertilizers and fertilizing technologies should be developed following the new sewerage systems.

Characteristics and Prosessing of Information Related to Nutrient Cycling in Agriculture