我国杂交水稻已经在生产上取得了巨大的经济效益。近几年来又取得了许多新成果,并向着新的高度进军。一、由组合单一化走向多样化多年来,我国生产上大面积推广应用的主要组合是汕优6号,威优6号以及北方杂交粳稻黎优57。这种组合单一的局面使杂交水稻的推广范围受到限制.也隐藏着某种病虫害大面积为害的巨大危险。“六五” China’s hybrid rice has made tremendous economic benefits in its production. In recent years, many new achievements have been made and march toward a new height. First, from the combination of a single to diversify Over the years, China’s production of large-scale promotion and application of the main combination of Shanyou 6, Weiyou 6 and the northern hybrid rice Lai You 57. This combination of single conditions has limited the scope of popularization of hybrid rice and also hides the great danger of large-scale pests and diseases. “Six Five”