用建立种子园的方法进行林木良种繁育的好处是大家所公认的,但在实际工作中尚存在不少困难。目前国外所采用的松树嫁接法所需要的时间、劳动和物资数量都较大,因此使建立嫁接种子园的工作受到了阻碍。在选择优良母树方面,目前也还没有找到合适的方法。在苏联,究竟应按哪些特征来选择优 It is acknowledged by everyone that the benefits of seed tree breeding by establishing a seed orchard approach are still widely recognized. However, there are still many difficulties in practical work. At present, the time, labor and materials needed for pine grafting used in foreign countries are relatively large, thus hindering the establishment of grafting seed orchards. In the selection of good mother tree, there is still no suitable method to find. In the Soviet Union, what features should be chosen according to which advantages