果树春季开花展叶时,需要消耗枝条中大量的氮素营养。枝条内的氮素营养主要是秋季积累和贮存的。特别是在树叶脱落之前能把大部分氮素转移到枝条内,然后才干枯落叶。为了使树叶在脱落之前能有更多的氮素进入到枝条中,我们可以在落叶前两周,在叶面喷 Fruit trees in spring flowering leaves, need to consume a lot of nitrogen nutrition in branches. Nitrogen nutrition in shoots is mainly accumulated and stored in autumn. Most of the nitrogen can be transferred to the shoots, especially before the leaves have fallen off, before the leaves are deciduous. In order for the leaves to fall off before they can have more nitrogen into the branches, we can two weeks before deciduous, foliar spray