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春季天气变暖后又突然变冷,甚至出现霜冻,这种现象叫“倒春寒”。小麦返青前期是最易遭受冻害的,据调查,早播小麦比适播小麦受害重,单一施肥比配方施肥的受害重。且受害程度主茎重于分蘖,低位分蘖重于高位分蘖。受害小麦一般减产10%～30%,重者达50%以上。因而一定要加强管理,注意预防。1 小麦幼穗冻害的形态特征植株最上1叶叶脉尖端发白,
When the weather is warm in spring, it suddenly becomes colder and even frost occurs. This phenomenon is called “late spring cold”. Pre-wheat rejuvenation is the most vulnerable to frost damage, according to the survey, early-sowing wheat than suitable sowing wheat victims, a single fertilizer than the formula fertilization victims. The degree of damage to the main stem heavier than the tiller, low tiller heavier tiller. Victims of wheat generally cut 10% to 30%, severe cases of more than 50%. Therefore, we must strengthen management and pay attention to prevention. 1 wheat ear frost damage morphological characteristics of the plant leaf tip vein white,