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一、试验过程 (一)试材的引进我们于1960年12月,从中国林科院林研所杨树杂种圃中,引进了小叶杨×黑杨、小青杨×黑杨杂交组合中部份杂种植株的枝条。当年冬季贮藏在吉林省林研所的地窖内。 (二) 试种、初选 1961年4月将与同期引进的近50个品种或杂交组合,在试验基点(白城市苗圃)进行试种。在当年生长后期,发现这两个杂交组合中的苗木,无论在生长速度还是对叶部病害的抗性方面,都发生了明显地分化,因此当年秋季将生长缓慢、黑斑病重的类型予以淘汰。
First, the test process (A) the introduction of test materials We December 1960, from the Chinese Academy of Forestry Forest Research poplar hybrids, introduced Populus × Populus, Populus × Poplar hybrid middle part Branch of a hybrid plant. The winter was stored in the cellar of Jilin Institute of Forestry. (B) trial, primaries April 1961 with the introduction of the same period over the past 50 varieties or hybrid combinations, the test point (Baicheng nursery) for trial planting. In the late growth stage of the year, seedlings of the two crosses were found to be clearly differentiated both in terms of growth rate and resistance to leaf disease, so in the fall of the year seedlings grew slowly and the type of black spot disease was given Elimination.