杂交水稻制种田杂株,除苗期和抽穗期坚持认真去杂外,收获时的去杂工作是确保种子纯度不可缺少的重要一环。过去收获时除杂都是以包颈现象的轻重有无、结实率的高低来辨认杂株保持系的。近几年来,由于制种技术的提高,“九二○”用量的加大,使得母本包颈现象基本解决,异交结实率 Hybrid rice farming hybrids, except at the seedling and heading insist on going extra careful, go to the work of harvesting to ensure the purity of seeds is an indispensable part of an important part. In the past when harvesting impurities are based on the phenomenon of whether the package neck weight, seed setting rate to identify the level of lines to maintain line. In recent years, due to the improvement of seed production techniques, the increase in the amount of “920” makes the maternal package neck basically solved, and the rate of out-crossing and seed-setting