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正岡 淑邦, 杉原 進, 小島 誠. "8-22 アルファルファ根から分泌される有機酸様物質について(8.畑・草地および園地土壌の肥沃度)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 35.0 (1989) 132