我国杂交水稻自问世以来,在粮食增产中起了重要的作用,与此同时,我国湖南杂交稻研究中心实际上已成为世界杂交稻研究中心,所以,“七五”期间如何发展和提高杂交水稻的增产优势,无疑是水稻育种研究的重大课题。我想就如何实现杂交粳稻的新突破提出拙见,同大家商榷。一、北方稻区的特点和杂粳的现状我国北方稻区是粳稻的一统天下,其栽培制度是一季稻或麦稻两熟制。北方稻区光 Since the advent of hybrid rice in our country, it has played an important role in the increase of grain output. At the same time, Hunan Hybrid Rice Research Center in our country has actually become the world hybrid rice research center. Therefore, how to develop and improve the hybrid rice The yield advantage is undoubtedly a major issue in rice breeding research. I would like to make my humble opinion on how to achieve a new breakthrough in japonica hybrid rice, to discuss with you. First, the characteristics of the northern rice area and the status of the hybrid japonica Rice in northern China is a unified world dominated by japonica rice, its cultivation system is a quarter of rice or two systems of wheat. Northern rice area light