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. 2017 Nov 20;12(11):e0188361. doi: 10.1371/journal.pone.0188361

Table 3. The correlation coefficient between the P forms and soil properties.

Soil	Soil P forms
Properties	H₂O-P_i	H₂O-P_o	NaHCO₃-Pi	NaHCO₃-P_o	NaOH-P_i	NaOH-P_o	HCl-P	Residual-P
TC	0.860^**	0.832^**	0.759^**	0.753^**	0.841^**	0.793^**	0.777^**	0.677^**
TOC	0.067	0.015	0.05	−0.08	0.052	0	−0.107	−0.03
TIC	0.827^**	0.821^**	0.735^**	0.782^**	0.814^**	0.788^**	0.816^**	0.686^**
Fe_ox	0.064	−0.125	−0.087	−0.16	−0.012	−0.109	−0.08	−0.322^*
Al_ox	0.301^*	0.183	0.147	0.168	0.245	0.167	0.219	−0.058
Ca²⁺	0.833^**	0.892^**	0.854^**	0.855^**	0.881^**	0.900^**	0.902^**	0.837^**
pH	−0.688^**	−0.616*	−0.613^**	−0.552^**	−0.629^**	−0.637^**	−0.571^**	−0.518^**

**Significant at P<0.01.

*Significant at P<0.05.