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作者于1989年7月至9月在民主德国进行了土壤肥料的合作研究、它们的许多工作值得我们学习和借鉴,现将主要情况报道如下: 一、民德土壤肥料研究机
The author conducted a cooperative study on soil fertilizers in Germany from July to September 1989. Much of their work deserves our study and reference. The main facts are reported as follows: 1.Mindel Soil and Fertilizer Research Station