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经１１年研究，从毛泡桐（陕西周至）×白花泡桐（湖北黄岗）杂交组合的Ｆ１中，选育出了陕桐３号和陕桐４号两个优良无性系。其主要特点是速生、材质好、抗性强。７年生对比林中陕桐３号材积比对照豫杂１号大４７．６％，陕桐４号比豫杂１号大６３．７％。陕桐３号木材力学性质显著优于豫杂１号，抗旱性中等，感病性与豫杂１号接近；陕桐４号抗旱性显著优于豫杂１号，木材材性与豫杂１号接近。
After eleven years of study, two elite clones, Shantung No.3 and Shaan Tong No.4, were bred from F1 of a cross combination of P. guajava (Zhouzhi, Shaanxi Province) × P. bungeana (Huanggang, Hubei). Its main feature is fast, good material, strong resistance. Compared with the control Yuza No. 1, the volume of Shantong No.3 in the 7-year-old contrast forest was 47.6% larger than that of the control Yu Shaza No. 1, and 63.7% larger than that of the Shanyong 4. The mechanical properties of the wood from Shantung No.3 were significantly better than that of Yuza 1, with moderate drought resistance and the susceptibility to Yuza 1; the drought resistance of Shanyong 4 was significantly better than that of Yuza 1, wood and Yuza 1 Close number.