新疆杨于1971年引进延安市,5年生平均高9.8米,平均胸径8.8厘米,生长良好。被群众称为“四旁”绿化的优良树种之一。但是,由于当地气候干旱,日温差大,春季地温回升慢,地表和地下温差悬殊(见附表),土壤板结,至使扦插育苗往往因发芽早,生根晚,水分供应不足而死亡,影响了新疆杨在生产上的发展。为此,我们遵照毛主席关于“实践、认识、再实践、再认识”的教导,针对延安地区 Xinjiang Yang introduced in 1971 in Yan’an City, 5-year-old average 9.8 meters high, an average diameter of 8.8 cm, good growth. It is one of the fine tree species that the masses call “all around” afforestation. However, due to the local climate droughts, large daily temperature difference, slow spring backs, slow temperature difference between surface and subsurface (see attached table), soil compaction, cutting seedlings are often caused by early germination, late rooting, insufficient water supply, affecting Xinjiang Yang in the production of the development. To this end, in accordance with Chairman Mao’s teachings on “practice, knowledge, practice, re-understanding”,