京郊山区有很多野生的胡桃楸,果实少而小,壳厚仁少。但它的根系发达,抗旱、抗寒能力很强。利用野生资源嫁接成经济价值高的核桃树,生长快,接后3—4年就可以结果,冬季不需抗寒。一、嫁按时期从胡桃楸展叶后到开花前嫁接最为合适,在北京地区以4月下旬为宜。过早,因胡桃楸锯断后流出的伤流液中合有很多单宁等有机物,易使接口发黑霉 There are a lot of wild Juglans majus in the suburbs of Beijing, fruit is small and small, shell thick kernel less. However, its root system developed, drought, cold ability is very strong. The use of wild resources grafted into walnut trees with high economic value, fast growth, then 3-4 years after the results, the winter without cold. First, marry according to the period from the Nutcracker leaf exhibition to the most suitable for grafting before flowering in Beijing in late April is appropriate. Premature, due to the flow of Jiujian saw out after the wound fluid with a lot of tannin and other organic matter, easy to make the interface black mold