腐殖酸对重茬烤烟氮积累及产量与质量的影响

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。

Effects of humic acid on nitrogen accumulation, production and quality of continuously cropped and flue-cured tobacco

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 nitrogen 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, respectively. 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.