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霜冻是指空气温度突然下降,地表温度骤降到0℃以下,使农作物受到损害,甚至死亡。预防方法有以下几种:喷水法在预报有霜冻出现时,于凌晨2~3时在作物或塑料薄膜上喷水2~3次,隔1小时喷1次。凌晨由于田间空气和植株间的湿度大、水分多;水汽凝结成露滴时会放出凝结潜热,同时水温比气温高,水在作物上遇冷凝结会释放热量,故采用喷水法防御一般不会有霜冻形成。灌水法可在预计有霜冻出现的前1天傍晚灌水,因为水的热容量大、导热性
Frost refers to a sudden drop in air temperature, surface temperature plummeted to below 0 ℃, so that crop damage, or even death. Prevention methods are the following: water spray method in the forecast of frost appears, at 2 to 3 am in the crop or plastic film on the water 2 to 3 times, 1 hour spray 1. Due to the humidity in the field between the air and plants in the early morning, more moisture; condensation condenses into a dew condensation will release the latent heat, while the water temperature is higher than the temperature, the water condensation in the crops will release heat, so the use of water law generally not defense There will be frost formation. Irrigation method can be expected in the evening before the emergence of frost 1 day irrigation, because the water heat capacity, thermal conductivity