山东省无棣县是全国著名的金丝小枣生产基地县 ,栽培枣树历史悠久 ,现有枣树 150 0万株 ,其中结果枣树 4 0 0万株 ,年产红枣 30 0 0万 kg。目前 ,无棣县金丝小枣生产中存在的主要问题是树龄偏大 ,衰老树占结果树的 30 %以上 ,1995年以前 ,衰老树平均株产仅 2 .3kg,在较大程度上 Wudi County, Shandong Province is the famous base of the production base of Ziziphus jujuba, jujube cultivation has a long history, the existing jujube 150 million, of which jujube 4 million results, an annual output of 30 million kg jujube . At present, the main problem existing in the production of Watkins jujube in Wudi County is that the tree age is too large and the aged trees account for over 30% of the result trees. Before 1995, the average yield of the aged trees was only 2.3 kg, to a large extent