Table 2.

The Pearson correlation coefficients (r) of the 24 samplers between Cd concentrations in the plant tissues and bioavailable concentrations of Cd measured by six methods.

Plant Species	Plant Tissues	DGT	Soil Solution	HAc	EDTA	NaAc	CaCl2
wheat	shoot	0.971 **	0.967 **	0.883 **	0.966 **	0.956 **	0.890 **
	root	0.979 **	0.979 **	0.894 **	0.974 **	0.975 **	0.934 **
maize	shoot	0.974 **	0.972 **	0.954 **	0.961 **	0.971 **	0.933 **
	root	0.970 **	0.962 **	0.944 **	0.969 **	0.936 **	0.949 **

** Correlation is significant at the level of p < 0.01.