杂交稻的选育成功,是我国科学家对(?)界农业的一大贡献,杂交水稻的推广在我国粮食增产中发挥了重要作用。 杂交粳稻在粳稻中所占的比例较小。在每年大约1亿亩粳稻面积中,杂交粳稻只有300万亩左右,大约占3％。如果我国现有粳稻面积的60％改种杂交粳 The successful breeding of hybrid rice is a great contribution made by Chinese scientists to agriculture in the world. The promotion of hybrid rice has played an important role in increasing grain output in our country. Japonica rice hybrid rice in a smaller proportion. In the annual area of ​​about 100 million mu of japonica rice, the hybrid japonica rice is only about 3 million mu, accounting for about 3%. If China’s existing area of ​​60% of japonica rice hybrid japonica