采用两套果枝减轻苹果梨霜冻的研究

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。

The Studies of Using Two Types of Fruit Branches Reserve Fruit bud and Regulate Fruit Loads

Through the observation of the florescences and spring frost injury ofapple pear trees for three years,it was found that flowers on long fruit branchesblossomed 8 days later than on short fruit branches. Flower frost injuty of long fruitbranches was obviously lower than that of short fruit branches.By reserving two types of fruit branches in spring pruning,and prunning the treeagain after frost to determine the numbers of fruit,it could ensure that the fruit treeshad good fruiting loads and the framework form of the tree was stable whatever it wasfrosted or not.