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一、冻害原因1.小麦遭受冬季冻害的原因品种因素:冬小麦品种分为冬性品种、半冬性品种和春性品种三类。各类品种播种后都需要通过春化发育阶段才能拔节抽穗。各类品种通过春化阶段需要的温度和时间不同。冬性品种,在0℃~3℃,30~50天可完成春化阶段;半冬性品种0℃~7℃,20~30天可完成春化阶段;春性品种0℃~12℃,5~15天可完成春化阶段。通过春化阶段之后的小麦抗寒性会大大降低。气候因素:秋冬季节,气温逐渐
First, the causes of frost damage 1. Winter wheat frost damage caused by species factors: winter wheat varieties are divided into winter varieties, semi-winter varieties and spring varieties three categories. After sowing all kinds of varieties need to develop stage of vernalization to jointing heading. The temperature and time required for all varieties to pass the vernalization stage are different. The winter varieties can be vernalized at 0 ℃ ~ 3 ℃ and 30 ~ 50 days. The semi-winter varieties can be vernalized at 0 ℃ ~ 7 ℃ and 20 ~ 30 days. The spring varieties are 0 ℃ ~ 12 ℃, 5 to 15 days to complete the vernalization stage. Winter wheat through the vernalization phase will greatly reduce the cold resistance. Climate factors: autumn and winter, the temperature gradually