1.层积 苹果砧木种子有海棠类、山定子、沙果等。据我们的经验,要当年育成1～1.5m高的苹果苗,最好的砧木是河北怀来海棠。怀来海棠种子层积需要60～70天,如来春3月10日播种,1月1日就要层积种子。层积方法是将种子用60℃温水 1. Laminated apple rootstocks have Begonia seeds, mountain statues, such as sand. According to our experience, it is necessary to cultivate 1 ~ 1.5m high apple seedlings in that year. The best rootstock is Hebei Huailai Begonia. Crab poplar seed stratification needs 60 to 70 days, such as spring March 10 sowing, January 1 stratification seeds. The stratification method is to heat the seeds with 60 ° C water