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有些乔灌木树种由于种子粒小(桦、桑、茶蔗子、绣线菊等),育苗工作即费工又要精细.苏联个别地区桦树育苗在苗圃中占很大面积,例如,哈萨克斯坦桦树育苗面积一般为135公顷,每公顷标准苗的产量为23～28万株.在改进桦树育苗技术方面林学家们和林业工作者进行了创造性的探索和大量的科学研究工作.哈萨克林业和造林改良土壤科学研究所对上述问题进行了20多年的研究.提出了在春夏之交播种不覆盖和遮阴的育苗方法,研究了植株的无机营养问题,制定了在塑料大棚内育苗的浇水制度,制成了播种覆沙的播种机等.
Some arborvitae shrub species are laborious and delicate due to their small seeds (birch, mulberry, tea cane, meadowsweet, etc.) Birch nurseries in some areas of the Soviet Union make up a large area of nurseries, for example, in Kazakhstan Birch nursery area is generally 135 hectares, the standard seedlings per hectare yield of 230 to 280 000. In the improvement of birch seedling technology, forest scientists and foresters conducted a creative exploration and a large number of scientific research.Kazakh Forestry And Afforestation Improvement Institute of Soil Science for more than 20 years of research on these issues.Proposed at the turn of spring and summer sowing coverage and shading seedling methods to study the inorganic nutrition of plants to develop a plastic greenhouse nursery Watering system, made of sowing sand seeder and so on.