Land is being continuously polluted due to human activities such as industrial development, urbanization, mining and intensive agriculture (Marchiol et al., 2007).Especiallyinnon-ferrousmetalsmelterarea, agricultural soil is usually contaminated with Cd and Zn by wastewater and dusts, and is unsuitable for crop production. Cadmium is a biologically nonessential element for plant (Satarug and Moore, 2004). Zinc is an important trace element of nutrient to plant, but excessive Zn is harmful. Plants readily take up Cd and Zn from the soil. Studies showed that Cd and Zn compete for uptake and translocation in plants (Hart et al., 1998; Cakmak et al., 2000).