目前,我国放任生长的核桃树仍占相当大的比例。核桃放任树的表现为:大枝过多,层次不清;结果部位外移,内膛空虚;生长衰弱,坐果率低;衰老树自然更新现象严重。对一部分放任生长的核桃幼旺树可通过高接换优的办法加以改造。对大部分进入盛果期的核桃大树,在加强地下管理的同时还要进行修剪改造,以迅速提高核桃的产量、品质。1.适期修剪核桃树如果落叶后修剪,极易由伤口产生伤流,伤流过多会造成养分和水分流失,有碍正常生长结果。因此,核桃修剪时期与其他果树不同,冬季最好不修剪。据观察,伤流一般从落叶后的11月中旬开始发生,伤流量逐渐增多,3月下旬芽萌动以后才逐渐停止。所以,核桃树修剪的适宜 At present, the walnut trees in our country still account for a considerable proportion. The performance of walnut laissez-faire trees is: excessive large branches, unclear levels; relocation of the results site, empty internal cavity; weak growth, low fruit set rate; natural regeneration of the aged trees is serious. Part of the walnut tree growth allowed to grow by high-exchange excellent way to be transformed. To most of the walnut trees into the flourishing period, while strengthening the underground management at the same time be trimmed to quickly improve the yield and quality of walnuts. 1. Prune the walnut tree pruning if deciduous, vulnerable to injuries caused by wounds, excessive wound flow will cause nutrients and water loss, hinder normal growth results. Therefore, the walnut pruning period is different from other fruit trees, winter is best not to trim. It is observed that the injury usually begins after mid-November after deciduous leaves, and the amount of wounds gradually increases. After the buds began to sprout in late March, they gradually stopped. Therefore, suitable for the pruning of walnut trees