Effects of brassinolide and auxin on growth, carbon and nitrogen metabolism and tobacco quality of flue-cured tobacco leaves after topping Soil fixing ability of flue-cured tobacco roots at different growth stages Effects of nighttime temperature increase on physio-chemical properties, yield and quality of flue-cured tobacco in high-altitude region of Yunnan Province Analysis of altitude adaptability of main flue-cured tobacco varieties in Kunming City Effect of global warming on climate feasibility index and available field days of flue-cured tobacco C, N, P stoichiometry traits of different flue-cured tobacco organs at different growth stages Effects of removing low fresh leaf on the quality and economic characteristics of flue-cured tobacco Effect of soil factors on quality and style of flue-cured tobacco in Qujing District, Yunnan Province Effect of microbial organic fertilizer on seedling growth, yield and quality of flue-cured tobacco Effects of nitrogen on metabolism and dry matter accumulation of flue-cured tobacco before and after topping