Correlation analyses of relevant parameters^a.

		Index	B	C	D	E	F	G	H	I	J	K
Wheat	A	Wheat-Cd	0.98**	−0.66	−0.99**	0.94*	0.98**	0.99**	−0.93*	−0.61	0.099	−0.69
	B	Rice-Cd		−0.63	−0.98**	0.91*	0.97**	0.96**	−0.89*	−0.63	0.12	−0.67
	C	Grain yield			0.70	−0.38	−0.76	−0.57	0.76	0.11	−0.70	0.53
	D	pH				−0.91*	−0.99**	−0.98**	0.95*	0.57	−0.17	0.72
	E	DTPA-Cd					0.87	0.97**	−0.82	−0.72	−0.23	−0.60
	F	HCl–Cd						0.96*	−0.96**	−0.49	0.27	−0.76
	G	Exc-Cd							−0.93*	−0.59	0.013	−0.73
	H	CB-Cd								0.29	−0.34	0.87
	I	OX-Cd									0.55	−0.10
	J	OM-Cd										−0.46
	K	Res-Cd										1.00
Rice	A	Wheat-Cd	0.97**	0.34	−0.98**	0.91*	0.89*	0.91*	−0.88*	−0.45	0.23	−0.82
	B	Rice-Cd		0.30	−0.95*	0.86	0.93*	0.92*	−0.86	−0.32	0.16	−0.91*
	C	Grain yield			−0.46	0.56	0.43	0.60	−0.59	0.24	0.53	−0.50
	D	pH				−0.97**	−0.95*	−0.96**	0.95*	0.29	−0.39	0.86
	E	DTPA-Cd					0.93*	0.96*	−0.99**	−0.16	0.60	−0.80
	F	HCl–Cd						0.97**	−0.96**	−0.015	0.48	−0.92*
	G	Exc-Cd							−0.98**	−0.070	0.47	−0.93*
	H	CB-Cd								0.029	−0.62	0.86
	I	OX-Cd									0.47	−0.040
	J	OM-Cd										−0.25
	K	Res-Cd										1.00

^a**Correlation is significant at the 0.01 level (two-tailed). *Correlation is significant at the 0.05 level (two-tailed). Wheat-Cd, rice-Cd, root-Cd: Cd concentration in wheat grains, brown rice and their corresponding roots, respectively.