核桃楸是北京山区分布较多的一种野生植物,用核桃嫁接共上加以利用,短期内即可获较大收益。通过总结群众经验,探索出提高嫁接成活率的一些关键措施,要点如下:1.嫁接时间和接穗冷藏:一般在萌芽前嫁接由于伤流液(俗称“黑水”)量大,不易成活。萌芽后的伤流液量则大大降低,嫁接易成活。在京郊以4月下旬为宜。但这时码子萌发也不易活,因此需在萌发前采码子,并将码子貯藏在冶窖中,抑制芽的萌动。2.高接换头和“放水”处理:由于树体不同高度的伤流液量不一样,一般一米以上处的伤 Juglans manshurica is a wild plant distributed more in the mountainous area of ​​Beijing. It can be harvested in a short time if it is grafted on with walnut. By summing up the experience of the masses, to explore some of the key measures to improve the survival rate of grafting, the main points are as follows: 1. Grafting time and scion cold storage: Grafting generally before budding due to wound fluid (commonly known as “black water”) large, difficult to survive . After the bud wound fluid volume is greatly reduced, easy to graft survival. In the suburbs in late April is appropriate. But at this moment, the codon germination is not easy to live, therefore it is necessary to pick up the codon before germination and store the codon in the cellar and suppress the bud germination. 2. High interchangeable head and “Drainage ” treatment: Because of the different height of the body fluid injury fluid is not the same, generally more than one meter at the injury