Contents of Medium and Trace Elements in Cured Tobacco Leaves in Bijie Area

Experiments were carried out to study the medium and trace elements in cured tobacco leaves in Bijie by analyzing 275 tobacco leaf samples.The results indicated that the average contents of cupper (Cu), zinc ( Zn), manganese (Mn), iron ( Fe), magnesium (Mg) and calcium (Ca) were 7.89 mg/kg, 40.51 mg/kg, 225.96 mg/kg, 444.72 mg/kg, 0.46%, and 2.95%, respectively. Leaves were found with moderate contents of Cu, Zn and Ca, rich in Mn and Fe, yet poor in Mg. The contents of Mn were rich in Bijie, Dafang, Qianxi, Jinsha, and Nayong. The high contents of Ca were found in leaf samples of Jinsha, Qianxi and Zhijin. The content of Mg was relatively lower in Bijie. The contents of medium and trace elements had general pattern in tobacco leaves at different stalk positions.The contents of Mn, Fe, and Ca decreased with the increasing leaf position, which held opposite in the contents of Cu and Zn.