一、育苗技术1．苗床选择2年以上未种过十字花种作物，且灌排方便的旱地作苗床。7～8叶大壮苗移栽，苗床与大田的比例以1：5为宜；5～6片叶中苗移栽，苗床与大田的比可增加到1：6～7。在生产中最突出的问题是苗床面积不足，有的都在1：10左右，由于荣氏面积小，留苗密度大，育 First, nursery technology Seedbed selection for more than 2 years have not been planted with cross-flowering crops, irrigation and drainage for easy dry land for seedbed. 7 to 8 leaves big seedling transplanting, seedbed and field ratio of 1: 5 is appropriate; 5 to 6 leaf transplanting seedlings, seedbed and field ratio can be increased to 1: 6 ~ 7. In the production of the most prominent issue is the lack of seedbed area, and some are about 1:10, due to Rong small size,