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本校教学基地连续３ａ（年）采用冬前沟栽大苗越冬的方法繁殖生产用大白菜杂交种，平均每６６７ｍ２产量达８７．７ｋｇ，比春季小株繁种增产４０％以上，而且管理方便、成本较低。现将其主要配套技术总结如下。１ 播种与定植黄淮地区适宜的播种期为９月底至１０月初。苗龄２
The school teaching base for 3a (year) with the winter before the ditch planting seedlings wintering method of breeding production of Chinese cabbage hybrids, the average yield of 87.7kg per 667m2 than the spring small plant species increased production more than 40%, and easy management, cost Lower. Now the main supporting technology is summarized as follows. A sowing and planting Huang Huai suitable sowing period for the end of September to early October. Seedling age 2