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目前全国杂交稻的推广面积约有一亿三千万亩。种植杂交稻的南方十省市,每年都需要繁殖大量的不育系种子和配制大量的杂交稻种子。而当前主要用的不育系是V20A、珍汕97A,V41A,这些不育系经过多年的繁殖使用,纯度上已经出现不同程度的下降,影响着杂交稻种的质量和杂种一代的产量。据有关单位的调查,杂交稻纯度每下降1％,亩产要少收_8-10斤,纯度下降10％,则杂交稻失去了增产优势。由此可见,纯度对杂交稻的增产已是起着十分重要
At present, there are about 130 million mu of popularized area for hybrid rice in China. Ten hybrid rice provinces in southern provinces, each year need to breed a large number of sterile seeds and the preparation of a large number of hybrid rice seeds. At present, the main sterile lines are V20A, Zhenshan 97A and V41A. After years of breeding, these sterile lines have been reduced in purity to some extent, affecting the quality of hybrid rice and the yield of hybrids. According to the investigation of the relevant units, the hybrid rice lost the yield-increasing advantage for every 1% decrease in purity of the hybrid rice, less-8-10 kg per mu, and a 10% decrease in purity. This shows that the purity of hybrid rice production has played an important role