进行湿润育苗成苗后0～8 d断水炼苗对比试验,结果表明:断水炼苗能促进移栽后前期烟株的株高、茎围、最大叶长和叶宽的生长,促进团棵期叶片的分化与生长,最终促进烟株长高、叶片增宽。断水炼苗能增加产量、产值和上等烟比例,断水炼苗4～8 d后移栽的产量、产值增加较明显,但差异不显著;断水炼苗4～6 d后移栽上等烟比例增加较明显,与其他处理差异显著。生产实践中宜断水炼苗4～6 d。 The results showed that water cut and hardened can promote the growth of plant height, stem circumference, maximum leaf length and leaf width at the early tobacco stage after transplanting, Differentiation and growth of leaves, and ultimately promote the tobacco plant height, leaf width. Water cut and seedling can increase the yield, output value and the proportion of superior tobacco. The yield of transplanting 4 ~ 8 d after water cut hardened, the output value increased obviously, but the difference was not significant; 4 ~ 6 d after transplanting, The proportion increased significantly, with significant differences with other treatments. Production practice should be cut off water 4 ~ 6 d.