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立春以后,气温逐渐升高,气候转暧,此时突然有寒潮来临,地表温度降到0℃以下,会使已经开始返青或进入拔节期的冬小麦发生霜冻危害,即为早春冻害,也被称为倒春寒。此气侯在2月下旬,3、4月份出现最多。近年来由于暖冬年抗寒性弱的品种也能越冬,助长了农民在冬小麦播种时不注意对小麦抗寒性的选择,在本应种植强冬性品种的地区种植了半冬性或春性品种,在寒潮
After the spring, the temperature gradually increased, the climate turns warm, when a sudden cold wave approaching, the surface temperature dropped below 0 ℃, will have begun to rejuvenate or join the winter wheat frost damage, that is, early spring frost damage, also known as For late spring cold. This climate in late February, March and April appeared the most. In recent years, due to the cold winter winter weak species can wintering, encourage farmers to sow winter wheat does not pay attention to the choice of wheat cold hardiness, should be planted in areas of strong winter varieties planted semi-winter or spring Variety, in cold wave