地膜覆盖对烤烟营养元素含量和烟叶产量品质的影响

采用田间试验研究了地膜覆盖对烤烟(Nicotiana tabacum L.)养分含量和烟叶产量品质的影响。结果表明，地膜覆盖可以提高伸根期烟株体内N，P，K，Cu，Zn的含量，但会显著降低旺长期和成熟期N，P，K，Mg，Fe，Mn，Zn的含量。灌水能不同程度提高不盖膜烟田成熟期烟叶矿质养分含量，但对盖膜烟田的作用较小．在不灌水条件下，地膜覆盖可以显著提高烟叶的产量和上等烟比例，降低烟叶总氮、烟碱含量，增加还原糖含量；在灌水条件下地膜覆盖对烟叶产量和质量都有不同程度的影响．

Effect of Plastic Film Mulching on Concentration of Nutrients and Yield and Quality of Flue-cured Tobacco

The concentration of nutrients and yield and quality of flue-cured tobacco (Nicotiana tabacum L.)mulched with plastic film were studied by field experiment. The results showed that plastic film mulching could significantly increase the concentration of N, P, K, Cu, Zn in the plant at root growing stage, and obviously decrease the concentration of N, P, K, Mg, Fe, Mn, Zn at vigorous growing and maturing stage. The mineral nutrients concentration in the plant was improved in varying degrees by irrigation when tobacco was not mulched with plastic film, but the effect was not significant when tobacco was mulched with plastic film. It was also found that yield, superior leaf ratio and content of reducing sugar in the cured leaf was significantly increased, while the contents of total nitrogen and nicotine were markedly decreased by plastic film mulching in drought condition. The results also showed that both the yield and quality was affected in varying degrees when tobacco was mulched with plastic film under the condition of irrigation.