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干热风是指小麦生育后期,即灌浆、乳熟阶段,由于高温、低湿,并且伴有一定风力的大气干旱现象。一般以下午14时气温大于或等于30℃,相对湿度小于或等于30%,风速大于或等于3米/秒作为轻干热风的指标。干热风灾害是指高温低湿使植株蒸腾加大,
Dry hot air is the latter part of wheat growth, that is grouting, milky stage, due to high temperature, low humidity, and accompanied by a certain wind of the atmospheric drought phenomenon. Normally afternoon at 14 o’clock temperature greater than or equal to 30 ℃, relative humidity less than or equal to 30%, wind speed greater than or equal to 3 m / sec as a light dry hot air indicators. Dry hot air disaster refers to the high temperature and low humidity to make plants transpiration increases,