3 506 samples of flue-cured tobacco leaves were collected from Qujing of Yunan Province and their Mg contents were analyzed, then decision tree analysis and regression analysis were used to study the influential factors. The results showed that Mg contents ranged from 0.36 g/kg to 17.70 g/kg with a mean of 4.10 g/kg in flue-cured tobacco leaves, and Mg contents were lower than 4.00 g/kg in 46.36% of the samples. Altitude, soil type, texture, organic matter, available potassium, available magnesium, and available calcium affected Mg content of f...
