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(一)去雄玉米双交种增产幅度很大的事实,已为大家所熟知,很多社队都想多种些双交种,以增加粮食产量.但玉米双交种种子的生产,却比较复杂,它有两个特点:一个是双交种的亲本繁殖地和配种田,需要和其他玉米田相隔一定距离,在新疆一般要求应在500米以上;另一个就是要进行去雄.双交玉米配种田为什么要去雄呢?玉米双交种,是由四个自交系经过两次杂交以后形成的,如在自治区推广面积很大的双交156,是用
(A) The fact that the yield increase of ex-maize double cross breeds has been very large has become well known to many people. Many communes and communes want more crossbreds to increase their grain output. However, the production of double-seeded maize seeds is more Complex, it has two characteristics: one is the breeding of the parents of double cross breeding and farming, need to distance from other corn fields in Xinjiang, the general requirements should be more than 500 meters; the other is to go to the male. Maize breeding farm why go to it? Maize double cross, is formed by the four inbreds after two hybrids, as in the autonomous region to promote a large area of double cross 156, is to use