Table 3.

Pearson correlation coefficients (r) between Cd fractions in the soil (n = 12)

	Cultivated soil					Uncultivated soil
	F1	F2	F3	F4	F5	F1	F2	F3	F4	F5
Cd25
F1	1	-0.685*	-0.454 ns	0.636 ns	0.174 ns	1	-0.451 ns	-0.876**	0.722*	0.245 ns
F2		1	0.090 ns	-0.796*	0.197 ns		1	0.519 ns	-0.849**	0.147 ns
F3			1	-0.524 ns	-0.331 ns			1	-0.774*	-0.120 ns
F4				1	-0.115 ns				1	-0.139 ns
F5					1					1
Cd50
F1	1	-0.803**	-0.753*	0.871**	-0.129 ns	1	-0.619 ns	-0.804**	0.862**	0.120 ns
F2		1	0.558 ns	-0.763*	-0.153 ns		1	0.815**	-0.870**	0.157 ns
F3			1	-0.917**	0.322 ns			1	-0.833**	0.131 ns
F4				1	-0.279 ns				1	0.145 ns
F5					1					1

**, and * show correlation is significant at the probability levels of 0.05, and 0.01 respectively, and ^ns denotes that the value is not significant. F₁, exchangeable; F₂, bound to carbonates; F₃, bound to organic matter; F₄, bound to iron manganese oxides; F₅, residual fractions