The tobacco is a sensitive plant for Cd, Zn and Pb. The effects of Cd, Zn and Pb are greater on tobacco than on wheat or rice.The accumulation of Cd, Zn and Pb in various organs of tobacco increases with their amounts in the soil.The sequence of Cd, Zn and Pb contained in various organs of tobacco is as follows: stems leaves roots grains. They are obstructed in roots, but they are easily transported into stems, leaves and grains.The increasing of Zn in the soil reduces the uptake of Cd by tobacco, but the i...