近年来,我国部分地区的初春、秋末和冬初,气温变化很大,农作物常会因气温的骤变而受到寒害,导致轻者减产,重者绝收。今年4月下旬,我国的苹果大省山东及甘肃普遍遭受了一场严重的晚霜冻为害,使得苹果挂果量明显减少,估计减产2～3成。实际上,寒害的提早抵御才是解决寒害的根本之 In recent years, the early spring, late autumn and early winter in some parts of China have experienced great temperature changes. Crops often suffer cold damage due to the sudden temperature changes, resulting in the reduction of light output and the heavy demand of crops. In late April this year, Shandong and Gansu Province, the apple-growing provinces in China, generally suffered a serious night frost damage, resulting in a significant decrease in the fruit-bearing yield of the apple plant. It is estimated that the output will be reduced by 2 to 3 percent. In fact, early treatment of cold damage is the fundamental solution to cold damage