造成冬麦越冬大面积死亡原因主要有三种说法。1、冻害:认为冬季小麦分蘖节迂到它不能忍受的低温而冻死。2、冻融交替:返复多次的一冻一化。3、早春霜冻。在苏联东部及我国新疆等地,已有大量试验证明该地大面积死亡多属冻害。麦苗抗冻能力愈差、分蘖节温度愈低,低温特续时间愈长冻害死亡率愈大。苏联有人把死亡率、分蘖节温度、冬前分蘖数三者建立过经验方程。这种方程是在一定条件下的统计结果, There are mainly three reasons for the large area of ​​winter wheat winter death. 1, frost damage: winter wheat tiller knot think it can not tolerate the cold and freeze to death. 2, alternating freeze-thaw: a return to a frozen one. 3, frost in early spring In the eastern part of the Soviet Union and our country, Xinjiang and other places, a large number of experiments have proved that the large area of ​​death is mostly frostbite. The worse the frost resistance ability of wheat germ, the lower the temperature of tillering node, Some people in the Soviet Union set the empirical equation for mortality, tillering temperature, and winter tiller number. This equation is the result of statistics under certain conditions,