品种纯度是指作物(或种子)群体中符合本品种特性特征的株数(或粒数)占整个群体的百分率。品种纯度是种子品质的重要指标。纯度低,表示种子混杂退化严重,不仅田间生育指标极不整齐(植株高矮不一、成熟迟早不同,影响田间管理作业与收获),而且会在不同程度上丧失良种高产、稳产和优质等优良种性,造成作物产量低而不稳和产品品质下降。反之,种子纯度高,表明 Purity refers to the crop (or seed) population in line with the characteristics of this species characteristics of the number of strains (or grain) as a percentage of the entire population. Variety purity is an important indicator of seed quality. The low purity means that the seeds are mixed and degenerated seriously. Not only the indicators of field fertility are extremely irregular (the plant height is different, the maturation sooner or later affects field management and harvesting), but also will lose the elite varieties with high yield, stable yield and high quality in varying degrees The resulting low and unstable crop yields and declining product quality. On the contrary, the high purity of the seeds indicates