林木播种期、播种量和播种方式,要根据所育树种的生物学特性和当地气候特点以及土壤条件、育苗的技术水平来确定. 我国北方大多数林木种子适宜春播.春播宜早不宜迟,早播的出土整齐、扎根深、苗木抗性强。夏季成熟的种子,如杨、柳、白榆等种子容易丧失发芽率,要随采随播.并要做到“三早”,即早备好圃 The sowing date, sowing date and sowing method should be determined according to the biological characteristics of the tree species, the local climatic characteristics as well as the soil conditions and the technical level of nursery. Most forest trees in northern China are suitable for spring sowing. Uniform unearthed sowing, rooted deep, seedlings resistant. Summer mature seeds, such as poplar, willow, white elm and other seeds easily lose germination rate, with slaughtered. And to do “three early”, that is,