一、水稻产量期待第三次突破 水稻是我国最重要的粮食作物,种植面积约占粮食作物总面积的30％,而总产占粮食总产的40％。稻米是我国50％以上人口的主食。在我国人口每年增加约1500万,而耕地不断减少的形势下,要保证粮食自给,就必须大力提高水稻单产。 在提高水稻单产的诸措施中,选育和推广良种最为经济有效。我国在20世纪50年代后期利用矮秆基因率先育成 First, the rice output is expected to break through the third time Rice is China’s most important food crops, planting area accounts for about 30% of the total area of ​​food crops, while the total output of 40% of total grain output. Rice is the staple food of more than 50% of China’s population. Under the situation in which the population of our country increases by about 15 million each year and the cultivated land is declining continuously, we must make great efforts to raise the yield of rice if we want to ensure self-sufficiency of grain. Among the measures to increase rice yields, the most cost-effective breeding and promotion of improved varieties is. In the late 1950s, China used the dwarf gene to develop first