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寒露前后,正是晚稻孕穗或抽穗扬花结实期,如遇上气温下降,日平均温度连续3天以上低于21℃的天气,叫寒露风天气。晚稻受寒露风天气危害会减产甚至失败。塞露风天气对晚稻危害的具体表现是:①孕穗期危害,会导致颖花严重退化;②抽穗扬花期危害,一是会影响抽穗速度,甚至不能完全抽出,从而出现包茎现象,二是会影响颖花的开花散粉和受精,形成空壳;③灌浆期危害,会影响谷粒正常灌浆发育,形成秕粒。 寒露风危害晚稻时,可采取如下几项防御应急措施,以减轻损失。 (1)喷施根外肥和生长刺激素,以增强稻株抗寒能力,
Before and after the cold dew, it is the late rice booting or flowering and flowering period, in case of temperature drop, the average daily temperature for more than 3 days below 21 ℃, called cold dew weather. Late rice cold dew weather damage will be reduced or even failed. The specific performance of dew windy weather on late rice is: ① booting hazards, will lead to serious degradation of spike; ② heading and flowering harm, one will affect the heading speed, or even can not be completely extracted, so there phimosis phenomenon, the second is Affect the flowering of spike powder and fertilization, forming an empty shell; ③ grouting hazards, will affect the normal grain filling development, the formation of tablets tablets. Cold dew wind damage late rice, the following defensive measures can be taken to reduce losses. (1) Spraying root external fertilizer and growth stimulating hormone to enhance the cold resistance of rice plants,