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以鲁白３号为试材，对大白菜结球中前期１４Ｃ示踪的试验结果表明，在标记２４小时内，１４Ｃ可被运转到植株的各个部位，尤以外叶和球叶的交界处较多。２４小时后，莲座叶内的１４Ｃ逐步向外运输，在球叶、根和茎三者间进行再分配。内部球叶由于不断生长，对１４Ｃ的竞争能力最强，其总放射性强度也最高。根系因为此时基本停止生长［３］，根内的１４Ｃ放射性强度也较高，而茎中的放射性强度相对较低。由此认为结球中前期，即产品器官旺盛生长期之前加强肥水管理是提高商品菜产量的关键时期。
Taking Luobai 3 as the test material, the 14C tracing test of Chinese cabbage in early prophase showed that within 24 hours of labeling, 14C could be transported to all parts of the plant, especially at the junction of the outer leaf and the leaf. many. After 24 hours, 14C in the rosette leaves are gradually transported outward, redistributing between the bulb leaves, roots and stems. As the internal ball leaves growing, the competitiveness of 14C strongest, its highest total radioactivity intensity. The roots stopped growing at this time [3], and the 14C radioactivity in the root was higher, while the radioactivity in the stem was relatively low. So that the early stage of the ball, that is, before the vigorous growth of organ products, fertilizer and water management is to enhance the yield of commercial products is a crucial period.