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玉米是天然异花授粉作物,加之生产条件和过程比较复杂,种子发生机械混杂和天然混杂的机会较多。实践证明,除了认真贯彻安全可靠隔离,规格无误播种,严格去杂去劣,及时彻底去雄,分收单放穗选五项技术外,还必须搞好原种繁育工作,对已经混杂的自交系进行提纯复壮,用优质原种有计划地定期更换生产
Corn is a natural cross-pollination crop, coupled with the production conditions and the process is more complex, the chance of occurrence of mechanical hybrids and natural hybrid seed more. Practice has proved that, in addition to conscientiously implement the safe and reliable isolation, sowing specifications without exception, strictly to miscellaneous and inferior, timely and complete male, receive a single election spike election five technologies, but also must do a good job in breeding of original species, the already mixed Exchanges were purified and rejuvenated, with high-quality original plan to regularly replace the production