Abstract
A pot experiment was conducted to investigate the effects of attapulgite clay, activated carbon, and liquid organic fertilizers used as soil amendments on cadmium (Cd) and lead (Pb) immobilization as well as on tobacco growth in contaminated soils. All three amendments reduced the amounts of DTPA-extractable Cd and Pb in soils as well as the concentrations of Cd and Pb in tobacco roots and leaves, compared to the control. Cadmium had a higher transportation index into tobacco leaves than Pb. DTPA-extractable Cd and Pb in soils was positively correlated with the metal concentrations in tobacco leaves, suggesting that DTPA-extractable Cd and Pb measurement could be a feasible method for assessing Cd and Pb bioavailability. Experimental results showed that upward trends of Soil and Plant Analyzer Development (SPAD) value in leaves were observed when tobaccos plants were grown in contaminated soils with increases of all the amendments. There were increases in root and shoot lengths as well as leaf area and dry weight for tobacco grown in amendment treated soils compared to the control.
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