Effect of oyster shell-humic acid co-application on the uptake of cadmi-um in Chinese cabbage
The cadmium(Cd)in facility vegetable fields has become one of the main pollutants.In order to explore the passivation effects of different combinations of organic and inorganic passivators on heavy metal Cd in facility soil,a greenhouse experiment was conducted to study the effects of exogenous application of oyster shells(0,0.23,0.45 kg·m-2)and compound oyster shell-humic acid(0.23 kg·m-2+7.5 g·m-2)on soil physicochemical properties,the growth of Chinese cabbage and the transportation of Cd.The results showed that the single application of oyster shells significantly increased soil pH(0.12-0.27).Both the single application of oyster shell and the combined application of oyster shell+humic acid reduced soil DTPA-Cd content by 31.34％-46.27％,respectively,compared to the CK treatment.The growth of Chinese cabbage was decreased in the single application of oyster shells(0.45 kg·m-2)treatment,while the compound with humic acid can significantly increase the dry mass of aboveground and underground parts of Chinese cabbage by 11.46％and 44.80％,respectively,compared to the CK treatment.The Cd content was decreased in the three treatments,and significantly decreased in the oyster shells+humic acid treatment by 51.4％,compared to CK treatment.The TF and BCF of Chinese cabbage were decreased in oyster shell treatment and the combined treatment of oyster shell+humic acids.The results of trace elements showed that the single application of oyster shell(T2)significantly increased the absorption of calcium in the aboveground and underground parts of Chinese cabbage,and also promoted the absorption of iron in the underground parts of Chinese cabbage.
Chinese cabbageOyster shellHumic acidsCadmiumTransfer coefficientBioconcentration coefficient
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