To compare with the conventional maize-wheat-carrot crop rotation model, a two-year field plot experiment of planting Sedum plumbizincicola, cadmium and zinc hyperaccumulator,has been carried out to study the safe agricultural production and repeated phytoremediation efficiency of a Zn/Cd contaminated soil as resulted from long-term application of sewage sludge containing manure. The results show that crops and S. plumbizincicola grow well in the soil under long-term application of sewage sludge manure. Compared with the control, the Zn and Cd concentrations in corn-wheat-carrots crop rotation system are all increased, but the Cd concentrations in wheat and carrots exceed and fail to meet the National Food Quality Standard. The Zn and Cd concentrations in soil under S. plumbizincicola treatments decreas markedly. The phytoremediation efficiency of Cd by S. plumbizincicola is 56.0%, while for the treatment of“continuous application of sewage sludge manure”, the phytoremediation efficiency is still as high as 48.4%. So under conditions of application of sewage sludge, planting with S. plumbizincicola and corn, the triple objectives of safe handling of sludge, promoting crop growth, and high phytoextraction efficiency could be achieved altogether.

sludge manure  /  Sedum plumbizincicola  /  heavy metal pollution  /  phytoremediation