一般来看,初春的晚上,天空如果没有云彩,地面就如同去了一层被子,就会特别冷些,如果冷到了结冰程度,空气中的潮气很大,接近地面的潮气就会在冰冷的树叶、石头、泥块上沾着,变成很细的冰针,这就形成霜了。当马铃薯等庄稼正在生长还未成熟的时期,它的茎、叶中还含有很多的水分。这种水分遇到了很冷的霜天,就在茎、叶的内部全都冰冻起来,茎叶的细胞就会丧失生活机能而死亡。马铃薯等作物的叶子也就成了火烧过似的干枯形状了。预防霜害,首先要关心气象台、站的天气预报。如预告有霜降,可采取壅灰、盖草等措 In general, the early spring night, the sky without clouds, the ground is like to go to a layer of quilt, it will be particularly cold, if the cold to the degree of freezing, the moisture in the air is large, the moisture near the ground will be cold Leaves, stones, lumps of mud clinging to become very thin ice needle, which formed a frost. When crops such as potatoes are not yet ripe for growth period, its stems and leaves also contain a lot of water. The water encountered a very cold frosty days, all in the stems, leaves, frozen inside, stem cells will die of life and death. The leaves of potatoes and other crops have also become a fire-like dry shape. Prevent frost damage, we must first be concerned about the weather station, the station’s weather forecast. As forecasted frost, can take ash, cover grass and other measures