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鈴木 武志, 岡本 昌太郎, 渡邊 郁夫, 井汲 芳夫, 藤嶽 暢英, 大塚 紘雄. "21-9 石炭灰や火山灰を投入した廃材チップ堆肥の化学成分の経時的変化とその肥料特性(21.土壌改良資材)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 45.0 (1999) 234