目前核桃生产普遍存在着经济效益低的问题,其原因,一是树体衰弱,产量低;二是品种混乱退化,产品质量下降。为提高植株产量、质量,增加效益,提出以下五条综合技术措施。一、大树改劣换优核桃由于多年的实生繁殖,出现很多低产劣种树,表现结果晚、产量低、品质差,应进行高接换优。1.嫁接时期 At present, there is a widespread problem of low economic efficiency in walnut production. The reasons are: firstly, the tree body is weak and the yield is low; secondly, the variety is degenerated and the quality of products is reduced. To improve plant yield, quality, increase efficiency, put forward the following five comprehensive technical measures. First, the improvement of walnut trees due to many years of real growth of walnut, there are many low-yield inferior trees, the performance of the results of late, low yield, poor quality, high exchange should be superior. Grafting