Effects of C/N regulated corn straw application on the flue-cured tobacco yield, output value and nitrogen, phosphorus and potassium concentration in the upper, middle and bottom leaf and cumulative uptake were studied by using the field plot experiments in Banqiao town, Qujing city, Yunnan Province during the 2008 — 2009 summer growing seasons. The results showed that the application of corn straw after C/N regulation could significantly increase tobacco production, nitrogen and potassium uptake of leaf. In particular, it was better with application of oilseed cake or vetch or other high-nitrogen biomass carbon and corn straw after C/N regulation. The yield of tobacco increased by 11. 53%, 9. 49% and 3. 73%, respectively, with application of corn straw and vetch, corn straw and oilseed cake, corn straw and urea nitrogen, compared with corn straw alone, the nitrogen concentration in tobacco leaf increased by 12. 95%, 4. 80%, and 7. 76%, the total nitrogen cumulative amount increased by 26. 15%, 15. 02%, and 11. 79%, the potassium concentration increased by 4. 11%, 5.24%, and 7. 79%, the total potassium cumulative amount increased by 16. 10%,15. 23%, and 11.81%, respectively. However, the phosphorus uptake of tobacco leaf decreased, and the application of corn straw alone reduced tobacco production, output and nutrient uptake. Therefore, the application of high C/N ratio corn straw in flue-cured tobacco production, which should be concerned not only to adjust C/N ratio by adding nitrogen, but also considering additional phosphorus applica-tion.%通过田间小区试验,研究玉米秸秆及调控碳氮比后施用对烤烟产量、产值及上、中、下部烟叶氮、磷、钾含量及累积吸收量的影响.结果表明,玉米秸秆调控碳氮比后施用可显著提高烟叶产量、产值；同时促进烟叶氮、钾吸收,尤其是利用油枯、苕子等高氮生物质材料与玉米秸秆进行调节碳氮比后施用效果更好；与玉米秸秆单独施用相比,玉米秸秆+苕子、玉米秸秆+油枯、玉米秸秆+尿素进行调控碳氮比后施用,烟叶产量分别提高11.53％、9.49％、3.73％,烟叶氮含量分别增加12.95％、4.80％、7.76％,氮总累积量分别增加26.15％、15.02％、11.79％,烟叶钾含量分别增加4.11％、5.24％、7.79％,钾总累积量分别增加16.10％、15.23％、11.81％;但是,烟叶对磷的吸收却有一定程度降低,玉米秸秆单独施用导致烟叶产量、产值及养分吸收降低；因此,在烤烟生产中施用高碳氮比玉米秸秆,既要注意补充氮素来调节碳氮比,也要考虑补充磷素.
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