The soil sample properties were measured according to conventional methods
Soil total Cd concentration(digested by
volume proportions of 24:3:4 with concentrated HF, HNO3 and
HClO4) and available Cd concentration (extracted with
0.1 mol L1 HCl), as well as Cd concentration and mineral
nutrition (digested by volume proportions of 5:1 with concentratedHNO3
and HClO4) were determined by atomic absorption
spectrophotometry (AAS, GBC932AA, Sydney, Australia).