Since the soils at the time the experiment was started had similar
physicochemical properties, the treatments were assumed to be comparable. Data were analyzed by one-way analysis of variance using SPSS
version 13.0 for Windows (233 S. Wacker Drive 11th Floor, Chicago, IL
60606, United States). Differences in the mean concentrations of aqua
regia-Cd in different treatments were compared using Duncan's multiple range test at the 5% level of significance.