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小麦早春若遇大雪、寒流、冰冻等低温天气,极易发生冻害。据调查,早播小麦比适播小麦受害重,单一施肥比配方施肥受害重。且受害程度主茎重于分蘖,低位分蘖于高位分蘖。受害小麦一般减产10～30％,重者达50％以上。 小麦幼穗冻害的形态特征:植株最上一叶叶脉尖端发白,无心叶,形成空蘖。一层层剥开叶鞘,从下往上数,第二节嫩芽折叠,柔软无光,似水烫一般。若第二节不再伸长,说明主茎生长点已停止生长。幼穗穗轴绿白色,小穗乳白色,排列松驰,失水萎蔫,黄化后死亡。 开春后,各地要注意分析天气形势,收听天气预报,切实采取预防措施,减轻冻害程度。 浇水防冻 在土壤水分不足的情况下,霜冻来
Wheaten snow in early spring wheat, cold, freezing and other cold weather, prone to frost damage. According to the survey, early-sowing wheat is more affected than suitable sowing wheat and single fertilization is harder than formula fertilization. And the main degree of victimization is heavier than tillers, tillers tillers at high tillers. Victims of wheat generally cut 10 to 30%, severe cases of more than 50%. Morphological characteristics of frying panicle in young wheat: the tip of plant leaf vein at the top of the plant was white, without heart leaves, forming empty tiller. Layers peel layers, from the bottom up, the second section of the bud folded, soft and dull, like hot water in general. If the second section is no longer stretched, indicating the main stem growth point has stopped growing. Young panicle green and white, spikelets milky white, arranged in slack, dehydration wilting, died after yellowing. After the spring, all localities should pay attention to analyze the weather situation, listen to the weather forecast, and earnestly take precautionary measures to reduce the degree of frost damage. Watering frost In the case of insufficient soil moisture, frost comes