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烤烟育苗前期外界气温低,烟苗细小,根系没有伸长,应加强保温,供给充足适量的水肥,以促进烟苗早生快发。后期外温高,床内温度可达30～40℃,烟苗易徒长,形成弱苗。此时除给予一定的肥水条件外,特别要注意炼苗,适应外界条件,使之地上部、地下协调生长,根系发达。所以,烤烟育苗床的管理原则是前促后控。
Flue-cured tobacco seedlings early low outside temperature, tobacco seedling small, no elongation of the root system, should be strengthened insulation, adequate water supply adequate fertilizer to promote the rapid emergence of tobacco seedlings early. High external temperature, the bed temperature up to 30 ~ 40 ℃, tobacco seedlings easy to grow, the formation of weak seedlings. At this point in addition to give a certain fertilizer and water conditions, with particular attention to hardening, to adapt to external conditions, so that the ground above the ground, coordinated growth of underground roots developed. Therefore, the principle of management of flue-cured tobacco seedbed is to promote control.