棉花是常异交作物,优良品种的遗传基础不纯,容易分化;又易自然串花杂交,发生变异;同时棉花轧花留种过程繁复,容易引起机械混杂。因此,棉花良种容易退化。我省鄂光棉衣分原来39％左右,现已降低到37％左右,结铃性也有减低。鄂岱棉虽然才推广,也已出现明显的分离现象,不仅株形不一,单株衣分率也差异很大。如不及时做好棉花良种提纯复壮工作,推广良种的退化现象将发展更快。伟大领袖毛主席教导我们说:“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成。”做好良种提纯复壮,使现有 Cotton is often outcrossed crops, the genetic basis of fine varieties of impure, easy to differentiate; easy to natural cross-flowering hybrids, mutation occurs; at the same time cotton gingival flower seedling complex process easily lead to mechanical hybrid. Therefore, the cotton varieties easily degenerate. Hubei Province, Oguang cotton original points about 39%, has now been reduced to about 37%, the bell also reduced. E-Dai cotton although it was promoted, there have been obvious separation phenomenon, not only different plant types, single plant clothing points are also very different. If you do not do a good job in the cotton seed purification purification and rejuvenation, the promotion of improved varieties will develop faster. Great leader Chairman Mao taught us: “With excellent varieties, that is, without increasing labor, fertilizer, but also get more harvest.” Good seed purification and rejuvenation, so that the existing