种子物料中的杂质,性质各有不同,清除的方法也就各有不同。其中轻杂是诸多杂质中最常见且含量多的杂质,因此轻杂也就成了种子清选过程中的主要清除对象。 1 轻杂的分类目前,我们可把种子物料中的轻杂大体分为三类:即重力轻杂、比重轻杂和相对轻杂。 1.1 重力轻杂,即种子物料中受到地球引力(即重量)比好种子小的轻杂。例如比好种子轻的尘土、颖 Impurities in the seed material, the nature of different, clear method will have different. Among them, light impurities are the most common and abundant impurities in many impurities, so light impurities become the main elimination target in the process of seed clearance. 1 Classification of light impurities At present, we can classify the light impurities in seed materials into three categories: light and light, light and light, and light and light. 1.1 Gravity Light hybrid, that is, the seed material by the Earth’s gravitation (ie, weight) is better than the seeds of the light hybrid. For example better than the seeds of light dust, Ying