油菜的越冬期,是指从1月开始到立春前。油菜在越冬过程中叶片最易受冻枯死,致使年后株体小、分枝数少,直接影响到产量。故此,冬季必须做好油菜的防寒护叶工作,保证油菜安全越冬。具体措施有:一、培育齐壮苗针对不同类型的苗情,采用不同的促发措施,保证油菜齐苗、大苗、壮苗,是抵抗低温的根本措施。一般冬前弱苗要增施有机肥为主,立争冬前多发根多 Overwintering rape refers to the beginning of January until the beginning of spring. Rape in the winter process most vulnerable to freeze-dried leaves, resulting in years after the small plant, a small number of branches, a direct impact on the yield. Therefore, winter rape must be well protected leaf work, to ensure the safety of rape overwintering. Specific measures are: First, nurturing Qi Zhuang For different types of seedlings, the use of different measures to ensure that the rape Qi Miao, seedlings, strong seedlings, is the fundamental measure to resist low temperature. Generally winter before weak seedlings to increase the application of organic fertilizer, stand up for more hair before winter and more