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南京地区丰产小麦的叶色在返青、拔节、孕穗阶段显现“青、黄、青”节奏变化。返青阶段叶片正常显“青”,植株体内有适当高的氮素水平,有利于小穗、小花发育,成长大穗;拔节阶段正常显“黄”,叶、鞘、茎生长协调,有利于茎节发育及壮秆形成;孕穗阶段叶色转“青”,有利物质运转,籽粒灌浆顺利,不实小穗减少,增粒、增重。在壮苗基础上重施腊肥,合理掌握春期追肥,控制叶片正常显青、落黄,有利形成壮秆、大穗,增粒增重、稳定高产。
The leaf color of high-yielding wheat in Nanjing showed the change of rhythm of “green, yellow and green” during returning to green, jointing and booting stage. The green leaves were normal in the rejuvenation stage, and the plants had the appropriate high levels of nitrogen, which was good for the spikelets and florets to develop and grow in large spikes. The normal stage of jointing stage was “yellow”, and the coordination of the growth of leaves, sheaths and stems was in favor of the stems Section development and strong stalk formation; booting stage leaf color turn “green”, favorable material operation, grain filling smooth, false spike reduction, granulation, weight gain. Grains on the basis of seedling re-Shi, a reasonable grasp of the spring top-dressing, control of the normal green leaves, yellow, the formation of strong stalks, big spike, grain weight gain, stable and high yield.