The effect of EDTA addition on copper(Cu) fractions in soils and soil solutions were investigated in phytoextraction of Cu polluted soil(about 290mg Cu kg[-1]) by maize (Zea mays L.) Cu accumulation in the shoots was accelerated by the EDTA addition to the soil. In the non-EDTA added soil, the exchangeable Cu fraction was 0.3% of the total Cu and the organically absorbed Cu fraction was dominant (43.4%). The exchangeable fractioni increased by the EDTA addition was 2.4% of the taotal Cu, indicating the increase in the plant useful Cu portion in the soil. The total Cu concentrations in the soil solutions were also elevated by the EDTA addition. The increments in the EDTA added soil solutions were attributed to the increase in the EDTA-Cu. Consequently, the EDTA addition would increase the amount of EDTA-Cu in the soil solutions, followed by an accceleration of the Cu accumulation in the maize shoot.
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