The higher the P and sugar content in leave and branches, the easier the flower bud differentiation.The higher C/N ration in C. suhurensis was benefit to flower bud differentiation.

• 在花芽分化期间，沙糖橘体内的氮素含量越低，磷素与糖分积累越多越有利于沙糖橘成花，碳氮比高有利于沙糖橘成花。