近几年来,我国南方和北方在杂交粳稻选育和推广上取得了可喜的成绩。但与杂交籼稻相比,推广步伐嫌慢,有些地区还一度出现不同程度的种子混杂现象。为了探讨这些问题的实质,寻出有效的解决途径,以便保证“七五”攻关任务的完成和促进杂交粳稻在南、北方粳稻地区健康发展,全国杂 In recent years, southern and northern China have made gratifying achievements in the breeding and promotion of hybrid japonica rice. However, compared with the indica hybrid rice, the pace of promotion is too slow, and in some areas there are some degree of mixed seeds. In order to explore the essence of these issues and find effective solutions, in order to ensure the completion of the “Seventh Five-Year” research mission and to promote the healthy development of japonica hybrid rice in southern and northern japonica rice regions,