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“寒露风”是我地双季晚稻生育后期常遇到的一种灾害性天气。“寒露风”来临时,温度急剧下降,若持续三天以上,对粳稻日平均气温低于20℃,对籼稻低于22℃,就会影响孕穗、抽穗和开花受精,造成大量空壳而减产。 我国南部的广东、广西地区,这样的天气多出现在10月上旬,时值“寒露”前后,故群众称它为“寒露风”。在长江流域一带的双季稻区,“寒露风”来得早,实际上是出现在“白露”至“秋分”之间,即一般年份在9月20
“Cold dew wind” is a kind of disastrous weather often encountered in the late season of late rice in our country. When the “cold dew wind” comes, the temperature drops sharply. If it lasts for more than three days, the average daily temperature will be lower than 20 ℃ for indica rice and less than 22 ℃ for indica rice, which will affect booting, heading and flowering and fertilization, . In southern China, Guangdong and Guangxi, the weather mostly appeared in early October, when the value of “cold dew” around, so the masses call it “cold dew.” In the double cropping paddy area along the Yangtze River valley, the “cold dew wind” came earlier, actually appeared in the “white dew” to “autumn equinox” between the general year on September 20