Objective]The experiment was carried out to study the effects of different magnesium appli-cation levels on yield and quality of flue-cured tobacco in Luzhou City,Sichuan Province.[Method]The field experiment was randomly divided into different small fields,with five levels of magnesium(0, 50,75,100,125 kg/hm2).[Results]The results indicated that compared with the other treatments,the plant height,the stem cycle and the pitch of stem were positively improved at the level of Mg 75-125 kg/hm2. There are the highest yield,output value and proportion of superior grade of leaves when mag-nesium application level was around in 50-100 kg/hm2. When magnesium application level around in 100-125 kg/hm2,the quality of tobacco leaf was improved,and the content of chemical compositions of tobacco leaf were most suitable.[Conclusion]Comprehensively consider the agronomic characters , economic characters and quality,the optimum Mg application level should be 100 kg/hm2 for flue-cured tobacco growth in Luzhou City.%【目的】为研究不同施镁水平对泸州地区烤烟烟叶产量和品质的影响。【方法】本试验以5个施镁水平（0、50、75、100、125 kg/hm2），3次重复开展大田随机区组试验。【结果】结果表明：从农艺性状来看，75~125 kg/hm2范围内增施镁肥能明显改善烟株的株高、茎围和节距；从烤烟的产量、产值和上中等烟的比例来看，以50~100 kg/hm2的施镁水平较佳；从烟叶化学品质分析，100~125 kg/hm2范围内增施镁肥有助于提高烟叶的化学品质，各项化学成分含量适宜，比例协调。【结论】因此，综合考虑建议泸州地区烤烟合理的施镁水平为100 kg/hm2。
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