一、小麦冻害指麦田经历连续低温天气而导致的麦穗生长停滞。冻害较轻的麦田,麦株主茎的幼穗受冻后,仍能正常抽穗和结实,但穗粒数明显减少。冻害较重时,主茎、大分蘖幼穗及心叶冻死,其余部分仍能生长。冻害严重的麦田,小麦叶片、叶尖像水汤一样地硬脆,后青枯或青枯成蓝绿色,茎秆、幼穗皱缩死亡。二、冬小麦冻害常见的类型冬小麦冻害主要分越冬期冻害和春季倒春寒(寒流)冻害两大类。三、冻害原因分析 First, the wheat frost injury refers to the wheat field experienced continuous low temperature weather caused by the growth of wheat stagnation. Frost less hardened wheat field, young wheat ear stalk fry, still normal heading and strong, but the number of grains per ear decreased significantly. Frost damage heavier, the main stem, big tiller panicle and heart freeze, the rest can still grow. Frozen serious wheat fields, wheat leaves, leaf tips as hard as water broth, after the green or dry blue-green, stems, young ears shrink shrink death. Second, winter wheat frost damage common types of winter wheat frost damage mainly in winter frost damage and spring late spring cold (cold) frost damage two categories. Three, frost damage analysis