小麦冬灌,在多数情况下能够获得良好效果。但是,由于冬灌是在小麦一生中温度最低的时候进行,如运用不当,也可能使小麦发生冻害而造成减产。特别是黄淮平原,地处暖温带向亚热带的过渡地区,最冷的1月份,月均温仍在零度以上,据许昌气象站20年(1953—1973年)的资料,月均温为0.5℃,小麦仍进行缓慢生长,从越冬到返青,春性小麦单株分蘖增加2—4个,次生根增加6—10条。当小麦缺乏抗寒锻炼,抗冻能力差,冬季出现寒流天气时进行冬 Winter wheat irrigation, in most cases can get good results. However, since winter irrigation is carried out at the lowest temperature in the life of the wheat, improper use may also cause frost damage to wheat resulting in reduced production. Especially the Huang-Huai Plain, is located in the warm temperate subtropical transition region, the coldest in January, the monthly average temperature is still above zero, according to Xuchang weather station 20 years (1953-1973) data, the average monthly temperature of 0.5 ℃, wheat is still slow growth, from winter to green, spring wheat tillers increased by 2-4 individuals, secondary roots increased by 6-10. When the lack of wheat cold hardy exercise, frost resistance is poor, cold winter weather occurs when the winter