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在北方园林绿化中经常采用榆树（UlmuspumilaL．）１～２年生苗木作为绿篱。通常情况下榆树苗当年采种当年育苗，若采用１年生苗作为绿篱用苗时，苗木就显得比较纤弱。为了解决这一难题，我们对榆树１年生苗进行植物生长素喷施试验，以促进１年生榆树苗达到优质壮苗的需要。１?
Ulmus pumila L., aged from 1 to 2 years old, is often used as a hedge in northern landscaping. Under normal circumstances elm seedlings year seedlings planted year, if the use of 1 year old seedlings as hedge seedlings, seedlings appear to be more delicate. In order to solve this problem, we carried out the auxin injection test on elm seedlings to promote the growth of 1-year-old elm seedlings. 1?