水稻是贵州省最重要的粮食作物 ,常年种植面积 73.3万 hm2 左右 ,约占粮食作物种植面积的三分之一 ,产量则约占粮食总产量的二分之一。贵州省从70年代末推广杂交水稻 ,80年代得到迅速发展 ,90年代杂交水稻已占水稻种植面积的主导地位 ,但由于贵州的生态和经济社会条件所限 ,常? Rice is the most important grain crop in Guizhou Province. Its perennial planting area is about 73.3 thousand hm2, accounting for about one-third of the acreage of food crops. Its output accounts for about one-half of the total grain output. Guizhou Province popularized the hybrid rice from the late 1970s and developed rapidly in the 1980s. The hybrid rice occupied the dominant position of rice acreage in the 1990s, but due to its ecological and economic and social conditions in Guizhou,