科研和生产实践证明,9—10月分是光合生产的大好时期。因此,要加强采果后的肥水管理,以充分利用秋温,扩大光合生产,增加贮备营养,争取连年丰产。(一)秋季施肥。在秋分前后,即金冠、元帅等中熟品种采收后。国光等晚熟品种采收前进行施肥。此时土壤温度14～21℃,正是苹果根系旺盛生长的适温范围,根系生长量大,吸收机能也较活跃。根据试验,秋季施肥后有60.7%的氮素被分配到根中贮藏起来。施肥时伤根也容易愈合。秋季施肥的作用主要有三:①补充果实采收后的树体营养,恢复树势;②充实花芽;③增加贮备营养,为来年果 Scientific research and production practice have proved that 9-10 months is a good time for photosynthetic production. Therefore, it is necessary to strengthen the fertilizer and water management after picking fruit so as to make full use of autumnal temperature, expand photosynthetic production, increase reserve and nutrition, and strive for successive years of high yield. (A) autumn fertilizer. Before and after the fall, that Golden Delicious, Marshal and other mature varieties harvested. Guoguang late maturing varieties such as fertilizer before harvesting. At this time soil temperature 14 ~ 21 ℃, it is the apple root vigorously growing temperature range, root growth, absorption is also more active. According to the test, 60.7% of the nitrogen in the autumn after fertilization is distributed to the roots for storage. Injured roots are also easy to heal when fertilizing. The role of fertilizer in autumn there are three main: (1) the recovery of tree fruit after harvest recovery, restoration of tree vigor; (2) enrich flower buds; (3) increase the reserve of nutrients for the coming year