茶树的良种繁殖,一般必须经过无性繁殖短穗扦插过程。可是茶树短穗扦插在长江以北的江北茶区一年中只能在夏秋两季进行。夏季气温高,扦插以后生长时间长,从扦插以后的发根情况看,在江北茶区来说,夏季扦插又优于冬季扦插,至于春季扦插在长江以北如不采取特殊技术措施,根本不可能成功。这是因为江北茶区夏秋季多干旱,冬季多严寒,夏秋季枝条经过严寒干旱后到了春天叶柄着生处容易产生离层组织,常常 The fine propagation of tea trees, generally must go through asexual short cuttings cutting process. However, short cuttings of tea trees in the north of the Yangtze River in Jiangbei tea can only be carried out in summer and autumn. In summer, the temperature is high and the growth time after cutting is long. Judging from the situation of hair root after cuttage, in summer, the cuttage in summer is superior to the cuttage in winter. As for the cuttage in the spring, if no special technical measures are taken to the north of the Yangtze River, May be successful. This is because the Jiangbei Tea District is more droughty in summer and autumn and has more frost in winter. After the cold and dry branches in summer and autumn, it is easy for spring petiole to produce the delamination tissue, often