由于种子往往和一定量的杂质,如茎秆、草籽、其它作物种子及不同的外形尺寸、破碎、受病虫损害的种子混在一起,因此,播种之前必须进行清选,达到规定的质量标准。由于作物种子和各种杂余通常有其各自不同的物理特性,因此可以用一台或几台设备进行机械分选,并使其具有理想的生 Because seeds are often mixed with a certain amount of impurities, such as stalks, seeds, other crop seeds, and different size, fragmentation, pest-damaged seeds, they must be cleared prior to sowing to the specified quality standards . Since crop seeds and various kinds of impurities usually have their own different physical characteristics, one or several pieces of equipment can be used for mechanical sorting and to make them ideal