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幼龄果树是指从定植到初结果以前的果树。由于定植后,幼树有以下生长特点,①要经过一个1—2年的幼苗期;②幼树新梢生长期长,封顶晚,树体内营养物质积累少;③根系分布浅,绝大部分处于冻土层中。又加上兰州立地早春气候干燥、多风,造成幼龄果树在3月中下旬至4月初发生“抽条”现象而不能安全越冬。抽条轻的一年生枝梢枯干,重者,
Young fruit trees are fruit trees from colonization to early results. As a result of planting, the saplings have the following growth characteristics, ① to go through a 1-2 year seedling stage; ② young shoots grow long, capped late, the accumulation of less nutrients in the tree body; ③ shallow root distribution, most In the frozen soil layer. In addition, the climate in Lanzhou was dry and windy in early spring, which caused the young fruit trees to experience the phenomenon of “splinting” in late March to early April and could not safely wintering. Light pumping annual shoots withered, severe cases,