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上森 晃, 飯田 周治, 新村 善男, 久津那 浩三. "1-16 土壌の物理性が機械導入におよぼす影響(第8報) : 水田土壌の経年変化(1.土壌物理)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 16.0 (1970) 8