历年我区晚茬油菜(晚移栽和晚直播)面积约占80—90%,晚茬油菜冬前菜苗素质差,抗寒保苗能力弱,“春发一根香,头顶一枝花,”单株生产力低,一般亩产只有几十斤。据我站1982年11月10日在新郑县梨河公社调查,晚移栽的油菜,一般根颈粗0.35—0.4厘米,有叶4.2片,最大叶20×6厘米(长×宽),苗高22厘米,苗瘦弱,还有一部分苗 Over the years in our area late crop of rape (late transplanting and late live broadcast) an area of ​​about 80-90%, Late crop of rapeseed winter poor quality of seedlings, cold seedlings weak, “a spring fragrance, a flower overhead,” single Low productivity, general mu only a few pounds. According to my station in November 10, 1982 in Xinzheng County Pear River commune investigation, late transplanted rape, the general root neck coarse 0.35-0.4 cm, leaves 4.2, the largest leaf 20 × 6 cm (length × width), seedlings 22 cm high, seedling thin, there are some seedlings