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川田 登, 松永 隆, 佐藤 文政. "7-23 火山灰水田の効率的水利用に関する研究(第15報) : 集落雑排水の実態と水田の水浄化能について(7.水田土壌の肥沃度)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 28.0 (1982) 112