用根插法繁育泡桐苗比播种苗具有管理方便、生育期短、生长整齐、苗木粗壮等优点,巳在我县生产中推广应用。为了进一步探索不同规格根穗对根插苗质量的影响,1976年,我们用泡桐苗圃苗根,剪成长12厘 Breeding Paulownia seedlings with the root plug sowing than the sowing has the advantages of easy management, short growth period, the growth of tidy, sturdy seedlings, etc., have been in the county to promote the application of production. In order to further explore different specifications of root spike on the quality of the root spruce seedlings, in 1976, we use Paulownia nursery seedlings root, cut 12%