Abstract
The purpose of this paper is to assess the reality of over application of livestock excreta into agricultural land and to present effective measures on it. Targeting Awaji Island as a case example, the amount of over application was estimated through statistical analysis, and 6 scenarios for improvement were established. As a result, the amount of over application was estimated as 160,000 ton/year (3,600 ton/tear of nitrogen). Also, reduction effect in 6 scenarios were; 2,900 ton/year in "Establishment of methane fermentation facility", 29,000 ton/year in "Compost recycling for moisture content adjustment", 29,000 ton/year in "Strengthening connection between farming and livestock", 45,000 ton/year in "Using idle fields", 22,000 ton/year in "Decrease of feeding animals", and. 124,000 ton/year in "All measures adoption". These results will help to determine an effective political measure in other areas.
