结球大白菜属十字花科、半耐寒性蔬菜，是我国北方人民主要的冬贮菜之一。与其它蔬菜相比，结球大白菜具有管理简单、产量高、经济效益好等优点，菜农广泛种植。部分菜农为了获取更大的经济效益，争取提早上市，竟任意改变播种期，提早播种，致使结球大白菜发生先期抽墓的现象? Chinese cabbage is a cruciferous cruciferous, semi-cold vegetables, is one of the main winter vegetables in northern China. Compared with other vegetables, Chinese cabbage with knot has the advantages of simple management, high yield, good economic benefits and the widespread cultivation of vegetable growers. Part of the farmers in order to obtain greater economic benefits, strive for an early listing, actually arbitrarily change the sowing time, sowing early, resulting in the first occurrence of Chinese cabbage tomb pumping phenomenon?