伟大领袖毛主席教导我们:“推广优良品种。有了优良品种,即不增加劳动力、肥料,也可获得较多的收成。毛主席亲手制定的农业“八字宪法”也把“种”列为重要内容之一,足见良种在农林业生产上是极为重要的。国内外农林业生产的先进经验证明毛主席的教导是非常英明正确的,一些林业生产较为先进的国家,近几十年来多采用精选遗传品质优良的优树(正号树,加号树)建立种子园,由于种子园内栽植的全部是优树的后代(优树的无性系),只能是优树无 Great leader Chairman Mao taught us: “Popularize fine breeds. With fine breeds, that is, without additional labor and fertilizers, more crops can be obtained.” The “Eight-Character Constitution” drafted by Chairman Mao also lists “species” as important Content shows that seed production in agriculture and forestry is extremely important.Advanced experience in agricultural and forestry production at home and abroad proves that Chairman Mao’s teaching is very wise and correct, some of the more advanced forestry production in the country, the use of more refined in recent decades Select good genetic quality excellent tree (positive sign tree, plus sign tree) to establish a seed garden, planted in the seed garden is all the descendants of superior trees (superior tree clones), only excellent trees without