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春季晚霜使油菜叶片、蕾、花、薹都受冻。冻害轻重与极端最低温度、低温持续时间、低温后气温回升快慢和油菜生育时期等因素有关。遭受晚霜冻害的油菜，失水后发生青枯，光合强度减弱，呼吸强度增加，贪青迟熟。对遭受晚霜冻害的油菜，可以采取割冻薹、追速效氮肥、药肥素混喷和推迟收获等措施补救。预防油菜晚霜冻害，除了覆盖、熏烟和灌水等物理方法外，主要通过选择适宜品种、合理肥料运筹和化学调控等措施，使油菜冬壮、春发、稳长，提高抗冻能力。
Spring night frost rape leaves, buds, flowers, sedge are frozen. Frost damage severity and extreme minimum temperature, duration of low temperature, the temperature rise after low temperature and the rape’s reproductive period and other factors. The rape suffered from night frost damage, withered and withered after dehydration, weakened photosynthetic capacity, increased respiratory intensity, and greedy lateness. The rape suffering from night frost damage can be remediated by cutting frozen sedge, chasing quick-acting nitrogenous fertilizer, spraying of medicinal fertilizer and delayed harvesting. To prevent rape late frost damage, in addition to covering, fumigation and irrigation and other physical methods, mainly through the selection of suitable varieties, rational fertilizer management and chemical control and other measures to make winter cole, spring hair, stable and improve antifreeze ability.