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大家 理哉, 石岡 厳, 木村 武. "牛糞堆肥中の抽出性窒素の特性並びに窒素無機化量との関係(20. 土壌改良資材, 2004年度大会講演要旨集)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 50.0 (2004) 160