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春天,小麦返青,棉花出苗,这时如遇寒潮,气温骤然降到作物不能忍受的程度,就要发生霜冻危害。很早以前,我国劳动人民就发明过熏烟防冻的方法。经过无产阶级文化大革命,各地群众又创造了许多防御霜冻危害的方法。例如,1974年甘肃省庆阳地区研制一种发烟剂,烟幕形成1小时后,覆盖区的温度能回升1—2℃,经三十多个公社试用,
Spring, wheat turn green, cotton sprout, then in case of cold wave, the temperature suddenly dropped to the extent that the crop can not tolerate, it is necessary to frost damage. A long time ago, our working people invented the method of fumigation of antifreeze. After the Great Proletarian Cultural Revolution, many people in all parts of the country have also created many ways to defend against the dangers of frost. For example, in 1974, a smoking agent was developed in Qingyang Prefecture, Gansu Province. After one hour of smoke screen, the temperature in the coverage area was able to rise by 1-2 ° C. After more than 30 communes were tried,