连续３ａ对苹果梨开花物候期及花期霜害调查，发现长果枝上花芽比短果枝的花芽晚开放８ｄ左右。花期霜冻长果枝明显轻于短果枝。据此，冬剪时采取留两套枝，霜后复剪定果，就可保证在有霜或无霜年份树体的适宜负载量，并使其结构稳定。 Continuous 3a pairs of apple pear flowering frost phenology and flowering survey found that flower buds on the long branch of fruit buds than short branches opened about 8d later. Flowering frost long branches are significantly lighter than short branches. Accordingly, the winter shears take to stay two sets of branches, after the scissors complex cut fruit, you can guarantee the frost or frost-free year the appropriate amount of tree load and make its structure stable.