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坂本 宣崇, 三浦 周, 野村 美智子. "7-12 寒地稲作における土壌および作物栄養診断のシステム化(第5報) : 下層土からの養分吸収量(7.水田土壌の肥沃度)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 34.0 (1988) 111