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从１９８５年开始，通过对红富士、红元帅等苹果树的主干粗度（干周）和枝组粗度及枝量的调查，发现干周和全树着生的枝量间的关系为正相关且呈幂函数曲线，枝组粗度和其着生的枝量亦呈幂函数相关，二者相关系数均达０．０１～０．０５显著水平。根据干周和枝组粗度，可计算出相应的枝量，并应用于修剪，使苹果树的修剪达到简化、量化、科学、合理。通过不同年龄阶段，不同修剪强度的对比试验，找出了各年龄阶段的最佳修剪指标：幼树期为０．２（即剪下２０％枝量），初盛果期为０．３，老龄树为０．４～０．５。此项技术在正定县６７０ｈｍ２苹果产区推广应用，收到了良好效果
From 1985 onwards, through the investigation of the stem thicknesses (dry weeks) and branch thicknesses and branches of apple trees such as Red Fuji and Hongyuan Shuai, it was found that there was a positive correlation between the branch numbers of dry weeks and the whole tree The power function curve, the roughness of branch groups and the branch numbers of their students also showed a power function correlation, the correlation coefficient between them reached 0.01 ~ 0.05 significant level. According to the dry weeks and branches of coarseness, can calculate the corresponding branch amount, and applied to the pruning, pruning apple tree to achieve simplified, quantitative, scientific and reasonable. According to the comparative experiments of different age stages and different pruning intensities, the best pruning indexes of all ages were found: the young pruning period was 0.2 (that is, cutting 20% shoots), the early growing stage was 0.3, The old tree is 0.4 ~ 0.5. This technology in Zhengding County, 670hm2 apple production and promotion, has received good results