金丝小枣老树修剪强度的研究

１９９６－１９９９年在山东省乐陵枣－粮间作地区对约６０年生的金丝小枣树进行了修剪试验，研究表明，修剪是使老枣树更新复壮、恢复产量的重要措施，修剪强度以轻剪为宜。结果基枝以保留４个枣股的结果密度最大（１．４７），较对照（０．７６）增加９３％，与留８个枣股及对照的差异显著，与留２个枣股的差异极显著。增加叶面积约２０％，叶绿素含量约增加１３．３６％，空吊数约减少３４％。

Research on the Pruning Intensity of Jinsi Jujube in Leling Area

A experiment was conducted on pruning intensity of 60 year old jinsi jujube ( Ziziphus jujuba ) from 1996 to 1999 in the jujube crop interplanted area of Leling County of Shandong Province.The results of the experiment showed that pruning is a most important measure which can revive the old jujube and raise the yield.And the pruning intensity should not be heavy.Taking the fruit branches as example,the branches with 4 buds had the highest fruit yield compared with the branches with two buds,eight buds and no pruning.The suitable pruning intensity can increase the leaf area and content of chlorophyll by 20% and 13.36% respectively,and decrease the number of branch cannot bear fruit by 34%.