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在6—8月间杉木花芽分化前2周左右,割开树皮,在木质部与韧皮部之间注射赤霉素,然后用塑料薄膜包扎伤口,促进愈合。一般使用剂量随树的大小而定,刚进入开花结实年龄的杉树中,每株可用5—10毫克药剂注射。杉木注射赤霉素后,球果数量增加1—9倍,重量增加1—3倍,而且赤霉素能调整雌雄花的比例,提早杉树开花结实年龄。这一方法值得在杉木种子园中试验应用。
In the period from June to August, about 2 weeks before the flower bud differentiation of Chinese fir, the bark was cut off, gibberellin was injected between the xylem and the phloem, and then the wound was covered with a plastic film to promote healing. The general use of the dose with the size of the tree, just entering the flowering age fir tree, each plant available 5-10 mg injection. After injecting gibberellin, the number of cones increased by 1-9 times and the weight increased by 1-3 times, and GA could adjust the proportion of male and female flowers and promote the age of flowering fir. This method is worth testing in fir seed orchard applications.