“寒露风”是指秋季第一次强冷空气南下对晚稻抽穗扬花有影响的低温天气。一般出现在9月中、下旬。此时正值秋分和寒露时节,故称之为“寒露风”。具体气象指标是:晚粳低于20℃,晚籼低于21℃,杂交晚稻低于23℃,连续三天就受害。晚稻在抽穗扬花期间遭受“寒露风”的袭击,会影响其正常抽穗开花,空秕粒增多,粒重减轻,产量降低。为减轻“寒露风“的影响, “Cold dew wind” refers to the cold weather in the autumn of the first strong impact of cold heading rice flowering late rice south. Generally appear in mid-September, late. At this time positive autumn and cold season, it is called “cold dew wind.” Specific weather indicators are: late japonica less than 20 ℃, late indica less than 21 ℃, late hybrid rice less than 23 ℃, three consecutive days of victims. Late rice suffered “cold dew wind” attack during flowering and flowering, affecting its normal heading and flowering, increasing the number of empty grains, reducing the grain weight and decreasing the yield. To alleviate the impact of “cold dew wind”