The different genotype response to fertilization varies greatly for tree growth. Therefore, the selection of superior genotypes and the optimal fertilization formula are important measures for cultivation of high-yielding forest. In this study, 30 hybrid clones of Betula platyphylla with supply different doses of formulated fertilization were used. Height, DBH (or ground diameter), and volume were recorded in 2-, 4-, and 5-year-old trees. Results showed that there were significant effects for clone, fertilization and age (P < 0.001), and significant interaction effects were found in clone × fertilization, age × genotype, fertilization × age, and genotype × fertilization × age (P < 0.05 or P < 0.01). The genetic correlation among growth characters showed that the height and ground diameter of 2-year-old seedlings had significant genetic correlation with year four and year five, thus the growth in 2-year-old clones can be used for selection criteria. Five superior clones were selected using membership function method. The genetic gains of height, DBH and volume were increased by 5.84%, 10.60% and 28.27%, respectively. The optimal fertilization was identified for each clone of B. Platyphylla and its hybrid with B. pendula.

不同的基因型对施肥的反应随树木的生长而变化很大。因此，优良基因型的选择和最佳施肥配方是高产林培育的重要措施。在这项研究中，使用了白桦的30个杂种无性系，分别提供了不同的配方施肥剂量。在2、4和5岁的树木中记录高度，DBH（或地面直径）和体积。结果表明，克隆，受精和年龄显着影响（P  <0.001），克隆×受精，年龄×基因型，受精×年龄和基因型×受精×年龄具有显着的交互作用（P  <0.05或P <0.01）。生长特征之间的遗传相关性表明，2年生苗的高度和地径与第4年和第5年有显着的遗传相关，因此2年生无性系的生长可作为选择标准。使用隶属函数法选择了五个优良克隆。身高，DBH和体积的遗传增益分别增加了5.84％，10.60％和28.27％。确定了最佳的施肥的克隆的白介孢杆菌及其与剑叶芽孢杆菌的杂交。