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什么叫“三寒”“三寒”即春寒、五月寒和秋寒。它是双季稻在不同的关键时期所经常遇到的一种寒害。严重地威胁和破坏水稻正常生长发育及产量的稳定。“春寒”——三、四月间阴雨连绵,冷暖无常。播下去的早稻种子(秧苗)常由于长时间阴寒或遇到西北风霜天而引起烂种烂秧或蹲苗死苗。此类天气便是春寒。以水稻发芽至移植对温度需求分析:早稻播插期气温应基本稳定在10～12度以上为适宜。凡日平均气温连续三天(或以上)低于12度者或极端最低气温低于5度的霜天或“露水霜”对其生长不利。此定为“春寒”。
What is “three cold ” “three cold ” that is cold, cold and autumn in May. It is a type of chill injury that double cropping rice often encounters at different critical periods. Seriously threatening and undermining the normal growth and development of rice and yield stability. “Cold Spring ” - Rainy weather in April and April, warm and humid. Sowing of early rice seeds (seedlings) often due to prolonged cold or encounter the northwest wind and frost caused by rotten seedlings or squat seedlings. This kind of weather is spring cold. To rice germination to transplant demand analysis of temperature: Early rice sowing temperature should be basically stable at 10 to 12 degrees above the appropriate. Frost days or “dew frosts” where the average daily temperature is below 12 degrees for three consecutive days (or above) or below the extreme minimum temperature of 5 degrees Celsius are detrimental to their growth. This is set as “spring cold”.