甜菜种籽的脱粒,在晒干之後,虽然经过风选、筛选,但还有一大部份夹什物(主要是花粳)因与种球重量、大小相近,还无法选出。如用人工清除,耗费劳力颇大。我国东北、内蒙甜菜栽培区,解决这一问题的方法,是先将甜菜种籽经过风选(风车)、筛选,然後再用一种特别的布面清种机进行清选(如图)。经布面清种机清选的种籽,其纯净率可达98％以上。工效较人工清选约提高10倍。 Beet seeds of threshing, after drying, although after the wind selection, screening, but there are a large part of the folder (mainly flower japonica) due to the ball weight and size similar to, can not be elected. As with manual removal, consuming a lot of labor. In northeast China and Inner Mongolia beet cultivation area, the solution to this problem is to first sieve the beet seeds through wind selection (windmill), and then use a special cloth surface sorter (Figure). Selling machines through the surface of the seed clearance, the purity rate of up to 98%. Ergonomics than manual clearance about 10 times.