一、穗选法:收获前在种子田或大田中严格进行选拔,要根据原品种的特征特性,如成熟期、抗性、长势、分蘖力、株高等选拔单株。再根据需要的种子数量,来决定穗选的数量。在室内进行复选一次,淘汰不符合原品种标准的单穗,然后将穗混合脱粒,作为下一年种子田的用种。二、片选法:是通过除杂去劣的技术措施,确保种子田的种子高纯质优。当稻穗刚抽出后,在品种纯度高的种子田,选择生长整齐,植株高矮一致,病虫害少的生产 First, the method of ear selection: Before harvesting in the field of seed or field strict selection, according to the characteristics of the original varieties, such as maturity, resistance, growth, tillering ability, plant height selection of single plant. Then according to the number of seeds needed to determine the number of ears selected. Check in the room once, remove the single ear that does not meet the standard of the original variety, and then mix and thresh the ear as a seed for the next year’s seed field. Second, chip election law: It is through the removal of impurities to poor technical measures to ensure high purity seeds of seed high quality. When the rice is just pumped out, in the high purity varieties of seed fields, choose to grow neatly, consistent plant height, pest less production