ミネラル収支制度のFarm Gate Balance Approachによる酪農経営の水質汚染問題に関する定量分析 : 北海道酪農専業地帯における飼料生産協業組織を事例として

概要

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The purpose of this paper is to analyze water pollution of dairy farms using farm gate balance approach of the Mineral Accounting System. Dairy farms in Japan have increased the number of cows and lactation quantity using imported concentrated feed. This has caused environmental pollution of dairy farms, including water and air pollution etc. Among this pollution, water pollution especially draws attention, which is caused by mineral efflux from fertilizer and cow manure. Among mineral efflux, this paper focuses on the efflux of nitrogen and phosphorus in dairy farms. Since it is difficult to show the actual nitrogen and phosphorus flow in dairy farms, we assume that nitrogen and phosphorus surpluses are potential losses of the dairy system. The results of this paper are as follows. First, it is important to decreasing water pollution potential to increase quantity of milk production per unit of purchase feed. Second, the dairy farms, which have participated in Okoppe Feed Service, may have chances of decreasing water pollution potential.
北海道大学の論文
2004-03-12