在“农业学大寨”运动的推动下,我国耕作制度发生了很大的变化,南方地区随着三熟制逐步地推广,粮食产量逐年提高。但在南方地区的秋季,晚稻抽穗扬花时常遭低温危害。这种低温通常称为“寒露风”,它容易造成水稻大量的空壳批粒,不但直接使本季产量降低,而且限制复种指数的进一步提高,对农业生产造成一定的影响。我们认为,解决这个问题的关键是选用耐寒的水稻品种。我国幅员辽阔,气候复杂,水稻品种繁多,抗寒品种 Driven by the “Agriculture Studies in Dazhai” movement, great changes have taken place in the farming system in our country. With the gradual popularization of the three-cropping system in the south, grain output has been increasing year by year. However, in the autumn of southern China, late rice heading and flowering are often endangered by low temperature. This low temperature, commonly known as “cold dew wind”, can easily lead to a large number of empty shells in rice. This not only directly reduces the output of this season, but also limits the further improvement of the multiple cropping index, which will affect agricultural production to a certain extent. In our opinion, the key to solving this problem is to use cold-tolerant rice varieties. China has a vast territory, a complex climate, a wide variety of rice varieties and cold-resistant varieties