In order to study the effects of humic acid in overcoming cropping obstacles of flue-cured tobacco ,three trials in the field were set including control (B1 ) ,local conventional fertilization (B2 ) ,and humic acid fertilizer (B3 ) , to investigate the changes of nitrogen accumulation and quality in flue-cured tobacco .The results showed that root nitro-gen accumulation tended to be increased during reproduction ,reaching the highest level with B3 treatment ,32 .62%higher than that by B2 during harvest .Stem nitrogen accumulation with B3 treatment was 41 .62% higher than that with B2 ,exhibiting significant differences .Nitrogen accumulation in lower leaves with B3 treatment was 35 .37% higher than that with B2 treatment .Middle leaves with B3 were 14 .61% higher than those with B2 treatment ,displaying significant differences .Upper leaves with B3 were 32 .64% higher than those with B2 treatment ,showing significant differences . B3 treatment promoted distribution of nitrogen into stem ,5 .27% and 1 .84% higher than B1 and B2 treatments ,respec-tively .Yield with B3 was 6 .94% and 7 .94% higher than B1 and B2 ,respectively .Leaf qualities of lower ,middle , and upper leaves scored 1 .50 ,2 .00 ,and 2 .00 lower than those with B2 treatment .Comprehensive analysis indicated that humic acid played important roles in improving nitrogen accumulation ,resulting in best yield of flue-cured tobacco .%为研究腐殖酸对克服烤烟重茬障碍的效果，试验在田间试验条件下设置对照（B1），当地常规施肥（B2），腐殖酸复混肥（B3）3个处理，研究了烤烟氮积累与烟叶品质变化规律。结果表明：根系氮积累生育期内呈现出增加的趋势，收获期B3处于最高值，与B2相比提高32．62％；茎内氮积累成熟期B3比B2处理提高41．62％，差异显著；下部叶成熟期B3比B2处理提高35．37％；中部叶B3比B2处理提高14．61％，差异显著；上部叶B3比B2处理提高32．64％，差异显著；B3促进氮在茎内的分配，比B1和B2处理分别提高5．27％、1．84％；B3产量与产值分别比B2提高6．94％、7．94％，烟叶质量评分下部叶、中部叶、上部叶分别低于B2处理1．50分、2．00分、2．00分。综合分析认为，腐殖酸对提高烤烟氮积累量和产量效果最佳。
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