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制种杂交大白菜父母本幼苗冬季管理。目标是保根护叶，积累营养，安全越冬，为此必须做好六防。一防冻害。大白菜能耐轻霜而不耐严霜．短期０℃至－２℃虽受冻尚能恢复，－２℃至－５℃以下则受冻害。幼苗进入越冬期叶片嫩，数目少，在冬季来临时应及早中耕培土，减少根茎暴露?
Winter Seed Production of Hybrid Chinese White Cabbage Parents. The goal is to protect the roots leaves, the accumulation of nutrition, safety and winter, this must be done six prevention. A frost damage. Chinese cabbage can be resistant to light cream and intolerant frost. Short-term 0 ° C to -2 ° C can still be restored by the cold, -2 ° C to -5 ° C by the cold damage. Seedlings into the winter tender leaves tender, the number of small, early in the winter when the soil should be cultivated to reduce rhizome exposure?