大白菜是我国栽培面积最大的品种，优良的杂交一代种子，是丰产的关键，因此生产出纯度好，整齐度高的杂种一代显得尤为重要。现将大白菜制种要点介绍如下。一、培育壮苗１、建造小拱棚播种河北，天津地区在１２月中旬小拱棚播种。选择上年未繁育过白菜的地搭风障建小拱棚，拱 Chinese cabbage is cultivated area of ​​China’s largest varieties, excellent hybrid generation of seeds, is the key to high yield, so to produce a good purity, high uniformity of the hybrid generation is particularly important. Cabbage seed now introduce the main points are as follows. First, nurturing strong seedlings 1, the construction of a small arch sowing Hebei, Tianjin in mid-December Shed Sowing. Select the past year did not breed cabbage to ride the wind to build small Shed, arch