实践证明,花生施用磷肥有显著的增产效果。因此,生产上已把施用磷肥作为花生丰产的重要措施之一。在施用方法上,以往都是作为基肥施入土壤或根际追施,近几年又实行了根外喷施,得到了促进荚果发育、增加产量的良好效果,从而引起了人们的注意,应用日趋广泛。为了探讨根外喷磷的方法和理论依据,我所于1964～1965年应用放射性同位素磷32进行了示踪试验.并得到了初步结果。 试验材料和方法 本试验两年都在田间进行。 1964年供试品种为早熟的伏花生。设两个处理:(1)喷施2％标记过磷酸钙 Practice has proved that peanut application of phosphate fertilizer significantly increased yield. Therefore, production has been the application of phosphate fertilizer as one of the important measures of peanut yield. In the application method, in the past as the basal fertilizer applied to the soil or the rhizosphere topdressing, in recent years has implemented a root spray, get pod development, increase the yield of good results, which attracted people’s attention, application Increasingly widespread. In order to explore the method and theoretical basis for phosphorus application outside the root, we conducted a tracer experiment using radioisotope phosphorus 32 from 1964 to 1965. The preliminary results were obtained. Test Materials and Methods The experiment was conducted in the field for two years. 1964 tested varieties of premature peanut. Set two treatment: (1) spraying 2% labeled superphosphate