小麦选种工作较早时提倡除杂去劣,块选、片选和穗选,以后发展到利用穗(株)行、系圃法繁育原种。此法提纯作用明显,但对克服退化、复壮增产的效果认识不一,具体做法也不同。有的认为提纯复壮是发挥良种增产潜力的一项有效措施;有的说稻麦良种不那么容易退化,复壮增产的效果也不大;还有的主张用一圃制代替三圃制繁殖原 Earlier wheat selection to promote removal of impurities, block selection, chip selection and ear selection, after the development of the use of Suizhizhu (plant) line, Department nursery breeding original species. The purification effect of this method is obvious, but to overcome the degradation, rejuvenation effect of different understanding, the specific approach is different. Some think that purifying and rejuvenating is an effective measure to give play to the potential for increasing the yield of improved varieties. Some say that rice and wheat are not so easily degraded and the effect of rejuvenation and yield increase is insignificant. Others claim that they should use one-