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The heavy metals such as Cu, Zn, Cd and Pb in paddy soil response to the annual outputs of pollutants from pig farms. (a) The relationship between annual outputs of Cu and content of Cu in paddy soil. (b) The relationship between annual outputs of Zn and content of Zn in paddy soil. (c) The relationship between annual outputs of Cd and content of Cd in paddy soil. (d) The relationship between annual outputs of Pb and content of Pb in paddy soil.
