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本试验于1962至1967年进行。1.在氮肥基础上配施不同形态磷肥,四年平均较单施氮增产2.24—13.45%,过磷酸钙较好,肥效快,历年稳定;钙镁磷肥其次;骨粉肥效慢,秋优于夏,夏茶优于春茶,年效应后效长,至第三年为各磷肥之首;钢渣磷肥最差。磷矿粉六年试验结果年年施较过磷酸钙为优,三年用量一次施较过磷酸钙差;同类磷肥比较,磷矿粉年年施的仍优于三年用量一次
The test was conducted from 1962 to 1967. 1. In the nitrogen fertilizer based on the application of different forms of phosphate fertilizer, compared with four years, an average of more than single nitrogen yield 2.24-13.45%, better than superphosphate, fertilizer fast, stable over the years; followed by calcium magnesium phosphate; , The summer tea is superior to the spring tea, the long-term effect after the effective long, to the third year for the first phosphate fertilizer; steel slag phosphate fertilizer the worst. Phosphorite six years of test results over the annual application of superphosphate is superior, three times the amount of a superphosphate application than the poor; similar phosphate fertilizer, phosphate rock annual application is still better than three years once the amount of