砧木种子的层积前处理河北省农技师范学院刘帅，张小军果树砧木的种子在长期的系统发育过程中，形成了一种自然休眠的特性。因此，在播种前要让其经过一定时间的低温层积处理，才能在播种后发芽。而在层积前对种子进行认真的选择处理则是保证层积效果的前提。１采种：层积... Stratum pretreatment of rootstock seeds Liu Shuai, Zhang Xiaojun, Hebei Agricultural Technology Teachers College, Heilongjiang, China The seeds of fruit tree rootstocks formed a natural dormancy during the long-term phylogeny. Therefore, before sowing to let it after a certain period of low temperature lamination treatment, in order to germinate after sowing. In the stratification of the seed before the serious choice of treatment is to ensure the effect of stratification of the premise. 1 seed: stratification ...