在疣枝桦的育苗实践中,常发现幼苗在生长初期在批死亡的现象。多数林学家认为,幼苗死亡是由于根茎日灼病所致,所以建议播种地必须遮荫。为了查明桦树幼苗的死亡原因,于1952——1955年在沙赫马托夫苗圃(奥连堡州)进行了研究。在土壤热处理(70—90℃)和未处理的土壤上的桦木营养播种试验,经过室内、室外的观察以及死亡 In the practice of nursery wart birch, it is often found that the seedlings die in the early stages of growth. Most forest experts believe that the death of seedlings is caused by sunburn caused by rhizomes, so it is recommended that the sowing sites must be shaded. In order to identify the causes of the death of birch seedlings, a study was conducted in Shahmatoman nursery (Oltenburg State) from 1952 to 1955. Birch nutrition sowing tests on soil heat treatment (70-90 ° C) and untreated soil, indoor and outdoor observation and death