纯度是种子最重要的质量指标,是农作物种子分级的主要依据。在GB4404—4409—84农作物种子中,对杂交种的分级规定了“种子分级指标”与“田间杂株(穗)率分级指标”两套标准,作为评价种子纯度高低的根据。在种子纯度与作物产量关系方面已有许多报道,为种子纯度标准提供了科学的论据。而在制种田间杂株(穗)与种子纯度、作物产量的关系方面缺少实 Purity is the most important quality index of seeds and is the main basis for classification of crop seeds. In GB4404-4409-84 crop seeds, the classification of hybrids provides two sets of criteria: “seed classification index” and “field (spike) rate grading index” as a basis for evaluating the purity of seeds. There have been many reports on the relation between the seed purity and the crop yield, which provides a scientific argument for the seed purity standard. However, there is a lack of knowledge about the relationship between plant (panicle) seed purity and seed purity and crop yield