我市是干热风危害的主要地区之一。据27年的气象资料统计,5月中、下旬至6月初平均每年发生干热风2次,时间长达7.8天,其中重型干热风发生频率达60％以上。发生干热风后,轻者减产1—2成,重者减产3成以上。为了预防干热风,促进小麦增产,我市在1979年示范推广飞机喷洒磷酸二氢钾7万亩,人工喷洒5万亩,共12万亩。1980年又扩大推广使用 Our city is one of the main areas harming the hot wind. According to the 27-year meteorological data, an average of 7.8 days of dry-hot air occur each year from mid-May to early June, with the frequency of heavy dry-hot air reaching more than 60%. After the occurrence of dry hot air, light production cut 1-2, heavy cut production more than 3 percent. In order to prevent dry hot air and promote wheat yield, the city in 1979 to demonstrate the promotion of aircraft spraying potassium dihydrogen phosphate 70,000 acres, artificial spray 50,000 mu, a total of 12 acres. In 1980, it expanded its use