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本文通过对引进的34个杨树品种在河套灌区进行苗期对比试验，对其生长量、物候期及抗性的观测，选出了3个优良的杨树品种。
In this paper, 34 poplar varieties introduced in Hetao Irrigation Area for comparative experiments at seedling stage, the growth, phenology and resistance observed, selected three good poplar varieties.