为了探索杨树有性杂交育种的新途径,我场于1974年秋开始进行杨树露天高接杂交育种试验,现将具体做法简介如下: 一、嫁接方法 1.嫁接时间:在我省的气候条件下,一般以7月下旬至8月中旬为宜。过早花芽当年开放,过晚接口愈合不好,越冬易受冻害。 2.砧木选择:最好选择3-5年的健壮杨树,以树木底层粗壮侧枝做砧木,要通风透光良好,以提高育种效果。 In order to explore a new way of sexual hybrid poplar breeding, my field in the autumn of 1974 poplar open high hybridization breeding test, the specific practices are as follows: First, the grafting method 1 grafting time: in our province’s climatic conditions Under, usually in late July to mid August is appropriate. Too early flower buds open, too late to interface healing, winter vulnerable to frost damage. 2 rootstock selection: the best choice of 3-5 years of robust poplar, thick stalks at the bottom of trees to do rootstocks, ventilation and good light to improve the breeding effect.