During the low temperature period in winter, rapeseed is susceptible to freezing damage. It is common for the leaves to be frozen, which is characterized by leaf rigidity, shrinkage, and purple. After the rapeseed is frozen, take measures to remedy it early.
   First, use fertilizer to remedy, timely application of fertilizer. For the weak rapeseed seedlings that have been frozen, apply the fertilizer as soon as possible, mainly based on manure, and appropriately increase the available nitrogen and potassium fertilizer.è¶ Sunny day, per mu, 500-750 kg of animal manure, 10 kg of urea, 5 kg of potassium chloride or 50-75 kg of ash. Due to the growth of excessively fermented rapeseed seedlings can not apply nitrogen fertilizer, the appropriate amount of phosphorus and potassium fertilizer should be applied, 5 kg of potassium chloride or 50-75 kg of plant ash and 7.5-10 kg of superphosphate. In severely deficient potassium fields, the amount of potassium fertilizer should be increased to promote the early growth of rapeseed seedlings.
Second, cultivating the soil and promoting the close connection of the roots and soil. Weak rapeseed and late transplanted rapeseed seedlings have weak root growth, poor freezing resistance, and the roots are not in close contact with the soil, and are more susceptible to freezing damage. For this part of rapeseed field, it should be cultivated, so that the plant edge is shallow and the line is deep. Combining the cultivating, dredging the ditch system, taking the root of the soil, increasing the temperature and keeping warm, protecting the root growth, which is good for preventing the late lodging.
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