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在当前大力发展银杏采叶园中，多产叶、产好叶，较长时间获取高产、优质、高效，是栽培者所追求的经济目的。然而，苗龄 7— 8年生以后，单位面积产量非但不能增长，而且药物成分的提取量也有所下降。把握苗木生长规律，当叶子产量、质量开始出现下降时，通过截干可以在一定程?
In the current development of Ginkgo biloba leaves, more leaves, good leaves, a long time to obtain high yield, high quality, high efficiency, is the cultivation of the pursuit of economic purposes. However, the seedling age of 7-8 years after birth, not only can not increase the yield per unit area, but also the extraction of pharmaceutical ingredients also declined. Grasp the law of seedling growth, when the leaf yield, quality began to decline, through the truncation can be a certain distance?