大白菜包心期共分三个阶段。包心前期(9月上旬～下旬),靠近球叶的外叶继续生长,球叶仍在不断分化.第1至5片球叶生长最快。每棵菜每天生长量1～1.5两。要求日平均温度15～17℃(白天18～20℃,夜间10～12℃)。包心中期(9月下旬～10月上旬)。外叶几乎不再生长,第1至5片球叶继续生长,第6至10片球叶为生长盛期,每天每棵菜生长量 Cabbage heart phase is divided into three stages. Preconditioning (early September to late), the outer leaves near the leaves continue to grow, the ball leaves are still constantly differentiated. The first to 5 leaves the fastest growing leaves. The daily growth of each dish 1 to 1.5 two. The daily average temperature required 15 ~ 17 ℃ (18 ~ 20 ℃ during the day and night 10 ~ 12 ℃). Medium heart package (late September to early October). Outer leaves almost no longer grow, the first to 5 pieces of leaves continue to grow, the first 6 to 10 pieces of leaves for the growth of the peak daily growth of vegetables