(1) After the cold has passed, check the seedlings in time. For the emergence of the root-raising phenomenon, rape must be cultivated in a time of 8 to 10 cm with crushed soil to prevent rooting.
(2) Rain and snow weather will rule out the accumulation of water in the field as soon as possible to prevent waterlogging from hindering root growth.
(3) In the thawing, sprinkle the ash or green earth ash, and spray fresh water on the leaves in time to ease the imbalance of water and prevent the loss of water.
(4) Apply topdressing fertilizer immediately after thawing to promote branching and increase fruiting area.
(5) For buds with severed stems and severely frozen leaves, remove them promptly.
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