陕北低产枣树增产技术研究

根据陕北枣树低产的原因，选择枣树土肥水管理、修剪和病虫防治三项关键技术，进行了研究。结果表明，三项关键技术是低产枣树增产的主因，一般增产３０％￣６０％。其中枣树土肥水管理技术是低产枣园改造的基础，修剪是调节树体营养，增大结果空间的有效途径，病虫防治是减少枣果损失的有效措施，在滩水地枣园可减少４０％以上的产量损失，三项关键技术的应用，还可显著增加吊股比，果吊比，单果重和枣果的商品率。

THE TECHNIQUES FOR ENHANCING JUJUBE TREES YIELD IN NORTHERN SHAANXI

According to the reality for low yield field,the techniques of the site preparation, fertilization and water management of jujube orchard, tree prunning and pest control was selected to be studied. The research results were shown that the 3 key techniques are main causes of incrasing yield for low yield jujube orchard, the extent of increasing yield is during 30% ~60%. And the site fertilizer and water management of the jujube orchard are bases of increasing yield- Jujube tree prunning is effective way,and the prunning can adjust the nutrition and increase the spacs of grow-fruit,the jujube tree pest control is effective measure to decrease the loss of jujube yield,and in irrigated land,the damage of jujubeyield can decrase more than 40% in the reseach bases. The implementation of 3 key techniques can evidently increase the fruit branch shortenedspur ratio, spur - fruit ratio, sigle - fruit weightand the commodity rate of the jujube fruit.