去年,我省一位农民种的20余亩玉米几日功夫叶子由叶缘叶尖失绿发展到全叶黄化.该农民以为是脱氮造成的,急忙给玉米施肥,几天后玉米不仅未返青,反而大批死亡,后来经鉴定是由于附近工厂排放的氟化氢气体毒害所致.为了使农民和基层干部及时发现鉴别有毒气体危害,现将作物受害症状作一介绍. Last year, a farmer in our province more than 20 acres of corn kung fu leaves a few days from the leaf edge of green leaves to the development of the whole leaf yellow. The farmers think it is caused by nitrogen, and quickly fertilize corn, a few days later, not only corn Instead of returning to youth, a large number of deaths were later identified as the result of the poisoning of hydrogen fluoride gas emitted from nearby factories. In order to enable farmers and grassroots cadres to identify the hazards of toxic gases in a timely manner, the symptoms of crop damage are now introduced.