引言种子活力系指种子内在的一种萌发、生长和生产潜力(1),幼苗的性状是种子活力之主要组份之一,受其内在的生长潜势(potential)所决定。诸如生长速率、整齐度、物质转化、合成、抗逆力等等,而这些性状之水平,又直接影响到作物以后的田间表现,以至产量。根据幼苗性状进行评价分级的幼苗分级法,能为我们准确评价种子质量,提供一项更能切合生产实际的活力指标,而且方法简便易行。 Introduction Seed vigor refers to a seed’s inherent potential for germination, growth and production (1). Seedling traits are one of the major components of seed vigor and are determined by its intrinsic growth potential. Such as growth rate, uniformity, material conversion, synthesis, resistance and so on, and the level of these traits, but also directly affects the field performance after the crop, and even yield. According to seedling traits, grading method of seedling grading can accurately evaluate the quality of seed for us and provide a vitality index that is more suitable for the actual production, and the method is simple and easy.