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落叶果树的种子经过长期的系统发育而形成了休眠的特性,给育苗播种发芽带来一些困难,必须吸收一定水分,在低温、通气和湿润条件下经过一定时间的层积处理才能发芽。可根据各树种需层积日数从播种期向前推算日期进行处理,以使种子通过自然休眠,就能按时播种萌发。层积种子要加强早春播种前的管理,否则将前功尽弃,既浪费物力、人力,又耽误播种育苗。
The seeds of deciduous fruit trees, after long-term phylogeny, form dormancy characteristics, which bring some difficulties to seedling and germination of nursery plants. Some seeds must absorb some water and can be sprouted after lapse of time under low temperature, aeration and humid conditions. According to the need to stratification of the number of species from the sowing date to date processing, so that the seeds through the natural dormancy, it can be timely sowing germination. Laminated seeds should be strengthened before sowing in early spring management, otherwise it will go to extinction, not only a waste of material and human resources, but also delay sowing seedlings.