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山口 益郎, 出浦 隆一郎, 柳生 義信. "7-18 湛水土壌における窒素の消長と形態変化について(その2)(7.水田土壌の肥沃度)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 14.0 (1968) 97