甘蓝杂交制种，目前在鲁西南地区主要有秋半成株制种和露地越冬制种两种。比较而言，露地越冬制种具有省工、成本低、技术简便、产量较高、成熟早等特点，而我们试验并推广的覆膜越冬制种，则是在露地越冬制种的基础上，采用覆膜技术，使甘蓝花期提前，从而解决了露地越冬制种 Cabbage hybrid seed production, at present in southwestern Shandong mainly semi-cropping and winter semi-open-field production of two species. In comparison, winter planting in open field has the characteristics of labor-saving, low cost, simple technique, high yield and early maturity, and the overwintering seed-making which we experimented and popularized is based on the winter planting in the open field, The use of plastic film technology, so that the early flowering cabbage, which solved the winter planting