有两种方法：摘叶和割茎。

There are two methods: priming and cutting the stalk.

youdao

它们与摘叶期至盛花期天数的相关系数分别为-0.62和-0.45，经检验，差异达到显著水平。

Their correlation coefficients with the days from picking off leaves to full flowering phase were-(0.62) and(-0.45), respectively(P<0.05).

youdao

记的小时候，我经常去那里玩，那时我还小，以为这是很多见的、我早以司空见惯的银杏树，没有什么奇怪的，于是我就摘银杏叶，把它当作我的玩具。

Remember a child, I often go there to play, I was still small, thought it was a lot to see, as I have in common the ginkgo tree, there is nothing strange, so I picked Ginkgo biloba on it as my toy .

youdao