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石川 昌男, 石川 実, 平山 力, 本田 宏一, 小山田 勉. "7-5 茨城県水田土壌に関する研究(第1報) : 水田土壌統間の相互関連性について(7 水田土壌の肥沃度)." Abstracts of the Annual Meetings, Japanese Society of Soil Science and Plant Nutrition 18.0 (1972) 72