作物是有生命的有机体,随着环境条件的改变,它的性状常会相应的发生改变。一个优良品种种植几年,如果不注意选择,就会混杂退化。因此,提纯复壮就是使种子由“杂”转化为“纯”,由“退化”转化为“复壮”,以获得相 Crops are living organisms, and as their environmental conditions change, their traits often change accordingly. A good variety planted a few years, if you do not pay attention to the choice, it will be mixed degradation. Therefore, the purification and rejuvenation is to make the seed from “miscellaneous” into “pure”, from “degradation” into “rejuvenation” to obtain the phase