霜冻是影响我区甜莱保苗的一大自然灾害。几乎年年都有不少地方因受霜冻为害而补种或移栽。在霜冻较重的年分里,甜菜成片地冻死,虽采取多种措施补救,但由于头茬苗数量大为减少,而造成严重减产。一九七七年春出现的一次晚霜,是我区近十几年来罕见的一次重霜冻。以巴盟地区为例,气象站观测霜冻出现时,地面零厘米最低温度平均 Frost is affecting my area Sweetie seedlings a major natural disaster. Almost every year, many places are replanted or transplanted due to frost damage. In the years when the frost was heavier, the beets died in freezing patches. Although various measures were taken to remedy the problem, the quantity of cuttings in the first crop greatly decreased, causing serious cuts. A night frost that appeared in the spring of 1977 was a rare heavy frost in our area in recent ten years. In the case of the Bameng area, the meteorological observational frost appears, the average minimum temperature of zero centimeters above the ground