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. 2015 Jul 31;5:12735. doi: 10.1038/srep12735

Table 2. Pearson correlation coefficients between soil parameters and wheat grain Ni and Cd concentrations.

	All samples (n = 150)		CC soil (n = 59)^a		NC soil (n = 91)^a
	Wheat grain Ni	Wheat grain Cd	Wheat grain Ni	Wheat grain Cd	Wheat grain Ni	Wheat grain Cd
Total Soil pH	−0.561^**	−0.346^**	−0.027	−0.029	−0.400^**	−0.238^*
Total Soil Ni	−0.032	−0.059	0.225	0.075	−0.045	−0.075
Total Soil Cd	0.018	0.347^**	0.012	0.548^**	0.243^*	0.471^**
Soil DTPA-Fe	0.578^**	0.421^**	0.307^*	0.314^*	0.380^**	0.323^**
Soil DTPA-Cd	0.099	0.509^**	−0.020	0.301^*	0.129	0.576^**
Soil DTPA-Ni	0.521^**	0.354^**	0.131	0.067	0.395^**	0.265^*
Carbonate	−0.308^**	−0.181^*	−0.127	−0.065	/	/

^aCC: carbonate-containing soil site, NC: non-carbonate soil site;

^**Correlation is significant at the 0.01 level (2-tailed).

^*Correlation is significant at the 0.05 level (2-tailed).