在果树品种结构调整中 ,闽西北地区加大落叶果树种植比例 ,发展很快。但由于落叶 ,二次开花现象严重 ,花芽发育不良 ,产量低而不稳 ,是当今生产上亟待解决的突出问题。1　低产成因1 1　品种问题　原产福建 ,但人们长期只知种植和收获 ,没有重视对其进行选优和提纯复壮 ,加 In the adjustment of fruit tree species structure, the proportion of deciduous fruit trees in northwestern Fujian increased, and the development of fruit trees was rapid. However, due to the deciduous leaves, the secondary flowering is serious, flower buds are poorly developed, and the yield is low and unstable, which is an outstanding problem to be solved urgently in production today. 1 low yield causes 1 1 species problems  native Fujian, but people only know long-term planting and harvest, did not attach importance to their selection and purification and rejuvenation, plus