种子混杂、籽粒瘪瘦影响发芽率,同时不能充分发挥土、肥、水等的作用。因此,提高种子质量是促进农业生产的关键措施。现就我省正定、栾城两县五年来,应用瑞士产比重式精选机及国产重力式精选机对小麦种子精选结果及推广效益简述如下: 一、精选的种子质量高、增产显著小麦种子经过机械加工精选,清除了瘪瘦粒、破碎粒、带壳粒、虫蛀粒和杂草籽,提高了种子质 Seed mixed, flattened grain affect germination rate, while not fully play the role of soil, fertilizer, water and so on. Therefore, improving seed quality is the key measure to promote agricultural production. Now on the province of Zhengding, Luancheng two counties for five years, the application of Swiss-made gravity sorting machine and domestic gravure selection of wheat seed selection results and the promotion of benefits are summarized as follows: First, the selection of high-quality seeds, Significant increase in production of wheat Seeds after mechanical processing selection, clearing deflated tablets, broken tablets, shell particles, insects and seeds weed seeds, increased seed quality