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棉花是常异花授粉作物,极易退化,一般通过三圃制(即一株传)提纯复壮的办法来防止种性退化,提高品质,增加产量。但从选择单株到大田生产,需要五、六年时间,如遇气候恶化,出苗差,死苗多,繁育时间则更长,不适应生产的需要。
Cotton is often cross-pollinated crops, easily degenerated, usually through the three Pu system (that is, a pass) purification and rejuvenation approach to prevent degeneration, improve quality and increase production. However, from selecting individual plants to producing in the field, it takes five or six years. In case of a worsening of the climate, emergence is poor and dead seedlings grow more and the breeding time is longer, which is not suitable for production needs.