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村本 穰司, 後藤 逸男, 蜷木 翠. "8-41 農大土壌研式土壌診断システムの開発(その4) : [実施例-3]長野県川上村レタス生産地域の土壌診断(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) 142