Effect of waste-CaCO3 on heavy metals uptake of low-accumulating maize:field study

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    A field experiment was carried out to study effects of waste-CaCO3 on growth and heavy metals (Cd,Pb,Zn,Cu) concentration of a low-accumulating cultivar of Zea mays in a soil contaminated by waste water from a lead/zinc mining,and changes in soil pH and available heavy metals content as affected by application of waste-CaCO3. Results show that waste-CaCO3 increased yield of the plant significantly.The effect was the most significant in treatments of high waste-CaCO3 application rate,where the first crop increased its yield by 154% and the second by 275% as compared with the control,and lowered their uptake of heavy metals (Cd,Pb,Zn,Cu).As a result,their concentrations in the grains were below the criteria of the Natural Food Hygiene Standard. waste-CaCO3,regardless of its application rate,increased soil pH and reduced the concentration of available heavy metals in the soil to a varying extent,and inhibited translocation of Cd and Cu from stem to grains of the plant,resulting in lower heavy metal concentration in the grains of Z.mays.

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Guo xiaofang, WEI Ze-bin, Zhou Jian-li, chen huo jun, wu qi tang. Effect of waste-CaCO3 on heavy metals uptake of low-accumulating maize:field study[J]. Acta Pedologica Sinica,2010,47(5):888-895.

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  • Received:January 01,1900
  • Revised:August 19,2009
  • Adopted:August 20,2009
  • Online: July 05,2010
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