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干热风条件:高温(气温≥25℃),低湿(相对湿度≤40％),干燥风(风速≥4秒米)。干燥风虽常年发生,但危害较重的年份只占10～20％。1964年危害最重,减产35％,一般减产15％。干燥风不只发生在干旱年份,春雨多的年份要比干旱年份发生的青干严重的多(如1964,1970年)。危害的关键时期是“小满”至“芒种”之间。俗称“麦到芒种自死”,麦到芒种无老少”,说明到芒种前如不能成熟易受害(此地是冬小麦,成熟较春小麦早)。接近成熟(乳熟到腊熟期间)的小麦,雨后骤晴,更易受害,因此,俗称之为“送殡雨”。抗锈病的品种,早追肥,排涝好,在早年耕作保墒好,适时灌溉,有林带保护的受灾轻。
Dry hot air conditions: high temperature (temperature ≥ 25 ℃), low humidity (relative humidity ≤ 40%), dry wind (wind speed ≥ 4 seconds). Although the dry wind occurs all the year round, the harms of the years make up only 10-20%. In 1964 the hardest hit, cut 35%, the general cut 15%. Dry wind occurs not only in the arid year, but more in the spring and rainy years than in the dry years (1964 and 1970, for example). The critical period of harm is between “Xiao Man” to “Manchu”. Commonly known as “wheat to mount species from death,” wheat to the species of all ages “, indicating that the species can not mature before maturity vulnerable (here is winter wheat, mature earlier than spring wheat.) Near mature (milky to waxy period) of wheat, rain After the clear sunny, more vulnerable, therefore, commonly known as ”send the funeral rain." Rust-resistant varieties, early top dressing, drainage is good, in the early farming soil moisture good, timely irrigation,