2013年春季,商丘市小麦连遭四次冻害:第一次,4月7日最低气温-2.1℃;第二次,4月10日最低气温-2.5℃;第三次,4月21日晚霜冻;第四次,4月22日晚降冰粒。前两次强寒流造成小麦部分小穗冻死或整株幼穗冻死,不同品种间,同一品种不同地块,同一地块不同地点冻害程度不一。后两次冻害主要是造成花药、柱头冻死,有颖壳无籽粒现象。轻者部分小穗不实,重者全穗 The spring of 2013, Shangqiu wheat even four frost damage: the first, April 7 minimum temperature -2.1 ℃; the second, April 10 minimum temperature -2.5 ℃; the third, the evening of April 21 Frost; the fourth, falling ice pellets on the evening of April 22. The first two cold spells caused the freezing of wheat spikelets or the freezing of the whole young spikelets. The frostbite levels varied with different varieties of the same species and with different locations in the same plot. After two frost damage is mainly caused by anthers, stigma frozen, glume-free grain phenomenon. Light part of the spike is not real, heavy whole panicle