Relationship between hydro-thermal conditions and absorption of potassium in tobacco leaves The status of mineral nutrition concentration in middle leaves of flue-cured tobacco from China Preliminary study on the relationships between tobacco leaf chemical components and quality at different regional scales Influence of Sulfur and Stillage Fertilizer on the Growth,Quality of Flue-Cured Tobacco,and pH in Alkaline Soil Effects of AM fungi on potassium absorption of flue-cured tobacco LI Dengwu, Effects of AM fungi on the growth and chemical composition of tobacco leaf under different P levels Impact of controlled-release compound fertilizer on flue-cured tobacco leaf antioxidant system Effects of light quality on photosynthetic characteristics and on the carotenoid and cuticular extract content in tobacco leaves Color Region Classification of Flue-cured Tobacco Leaves Based on the Image Differences of leaf gas exchange traits, chlorophyll fluorescencecharacteristics and chloroplast ultrastructure of Nicotianatabacum L.K326 under organic fertilization and chemical fertilization