秋季是果树光合作用的黄金时代,但器官功能早衰,常常成为光合作用的限制因子.据报导,在植物器官衰老之前,内源激素水平发生很大变化,此期如采取叶面喷施生长调节剂的办法,可有效地抑制器官衰老。据此,为了维持秋季的叶片功能,1983年在本站,于枝条(营养枝)趋于停长之前,进行了叶面喷布赤霉酸和尿素的试验。以观察维持叶片功能的效果。初步看出以下几点趋势; Autumn is the golden age of photosynthesis in fruit trees, but premature aging of organs often serves as a limiting factor for photosynthesis.Reportedly, endogenous hormone levels change significantly before plant organs are senesced, during which period foliar spray growth regulation Agent approach, can effectively inhibit organ aging. Accordingly, in order to maintain the function of autumn leaves, in 1983 in this site, branches (vegetative branches) tend to stop long before the test of foliar spray gibberellic acid and urea. To observe the effect of maintaining leaf function. Initially see the following trends;