一、试验目的 我国的育苗工作,在东北地区50年代培育针叶树苗多数是采取控光育苗的。60年代后,逐渐取消了控光,采用全光育苗,这在大面积育苗生产过程中既省物资又省劳力,因而受到生产部门的欢迎,这是必然的。但引起苗床土壤板结甚至冲刷,耗水量亦大, First, the purpose of the test nursery work in China in the 1950s in the northeast region to cultivate coniferous trees are taken to control the majority of nursery light. After the 1960s, the gradual elimination of the control of light, the use of all-photon nursery, which in the large-scale nursery production, both material and labor-saving, and thus welcomed by the production sector, it is inevitable. However, it caused the soil bed to even form flush with the seedbed and consumed more water.