在小麦繁育中,小麦种子的混杂是种性变劣退化的主要原因。混杂退化后的种子纯度明显下降,性状变劣,品质变差,抗逆性下降,产量明显降低。要获得优质种子,必须做好保纯防杂工作,这样才能使优良种性得到充分发挥,更好地延长优良品种的利用年限。1小麦繁育中出现混杂的原因1.1生物学混杂在田间不同品种间出现天然杂交,以致因后代分离而出现不良个体,破坏了品种的一致性,这叫做生物学 In wheat breeding, the confluence of wheat seeds is the main reason for the deterioration of species. After the mixed degeneration, the purity of the seeds obviously decreased, the characters were deteriorated, the quality became worse, the resistance decreased, and the yield was obviously reduced. To get high-quality seeds, we must do a good job in pure anti-hybrid work, so that we can give full play to good species, and better extension of the useful life of fine varieties. 1 mixed breeding reasons in wheat breeding 1.1 biological hybrids in the field between different varieties of natural hybridization, resulting in separation of offspring due to undesirable individuals, undermining the consistency of species, which is called biology