苹果、梨、桃杏的砧木种子,必须在经过一定条件下冬藏后才能发芽。冬藏的方法是:先用5%的硫酸铜水浸种1小时消毒(防立枯病),然后把种、细砂、清水按一定比例混合,小粒种子如海棠、毛杜梨等种沙比为1:4;大粒种子如桃、杏等,种沙比为1:10。所用的砂子以小于海棠种粒、不含泥土为宜。拌好的种沙不要太湿,用手握成团不滴水 Apples, pears, peach apricot rootstock seeds, must pass through the winter Tibet under certain conditions to germinate. Winter Tibetan method is: first soaked with 5% copper sulfate water for 1 hour disinfection (anti-bacterial blight), and then species, fine sand, water at a certain percentage of mixed, small seeds such as Begonia, 1: 4; large seeds such as peach, apricot, etc., the sand ratio of 1:10. The sand used to be less than the Begonia seed, soil is not appropriate. Mix well sand not too wet, do not drip into a group by hand