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目前关于夏玉米一次追施速效氮肥的适宜时期各地看法不尽一致。有的主张在小喇叭口期,有的主张拔节期,也有的主张在大喇叭口期等等。因此,夏玉米一次追肥的适宜时期尚需进一步探讨。另外,栽培措施对器官的促控作用我校李伯航在1963年曾对蹲苗进行过研究,施肥对器官的促控影响莱阳农学院及北京农大也有过报导,但我们认为追施速效氮肥对器官的促控影响尚不够明确。因此为了进一步摸索夏玉米一次追肥的适宜时
At present the appropriate time for summer corn topdressing available nitrogen fertilizer is not consistent throughout the view. Some advocates in the small bell mouth period, some advocate jointing period, and some advocates in the big bell mouth period and so on. Therefore, the appropriate period of summer corn top dressing needs further study. In addition, the cultivation and control of organs on the role of promoting our school Li Bohang had Dunhuang in 1963 had been studied, the role of fertilizers on the promotion and control of organs Laiyang Agricultural College and Beijing Agricultural University have also been reported, but we believe that topdressing of nitrogen on the organ Promote the impact of control is not clear enough. Therefore, in order to further explore the appropriate time for summer corn top dressing