多年来,各地先后选育并引进一批早稻品种(系),有的抗性好,有的产量高,有的米质佳或熟期早,有的同时具备了两个或两个以上的优点。但评价中往往仍偏重于一定条件下的产量高低来定品种的取舍。通过几年来的试验、示范和大面积承包服务证实:抗性的强弱直接对水稻产量构成一定的影响,因而应是权衡品种推广价值的一个极 Over the years, a number of early rice varieties (lines) have been bred and introduced successively in various places. Some have good resistance and some have high yields. Some are good or mature, while others have two or more advantage. However, the evaluation is often still biased under certain conditions, the level of output to determine the trade-offs. After several years of experiments, demonstration and large-scale contractual services have confirmed that the strength of resistance has a direct impact on rice yield and therefore should be a pole in weighing the promotion value of varieties