Table 4 Pearson’s correlation coefficients (r) between phosphorus fractions, biological activity and crop yield.

Variable	WS-P	NaHCO₃-Pi	NaHCO₃-Po	NaOH-Pi	NaOH-Po	HCl-P	TP	Av-P	Alk-p	Phy-P	Yield
WS-P	1
NaHCO₃-Pi	0.992**	1
NaHCO₃-Po	0.954**	0.967**	1
NaOH-Pi	0.868*	0.833*	0.865*	1
NaOH-Po	0.930**	0.921**	0.959**	0.942**	1
HCl-P	0.761*	0.752	0.718	0.835*	0.718	1
TP	0.975**	0.966**	0.972**	0.943**	0.984**	0.793*	1
Av-P	0.935**	0.944**	0.964**	0.842*	0.970**	0.608	0.957**	1
Alk-P	0.979**	0.985**	0.932**	0.786*	0.904**	0.668	0.940**	0.950**	1
Phy-P	0.972**	0.965**	0.909**	0.878**	0.881**	0.865*	0.950**	0.864*	0.929**	1
Yield	0.972**	0.962**	0.963**	0.934**	0.988**	0.765*	0.997**	0.968**	0.949**	0.937**	1

*, **Significant at 0.05 and 0.01 probability level, respectively.
WS-P Water soluble phosphorus, NaHCO₃-P_i Sodium bicarbonate inorganic phosphorus, NaHCO₃-P_o Sodium bicarbonate organic phosphorus, NaOH-P_i Sodium hydroxide inorganic phosphorus, NaOH-P_o Sodium hydroxide organic phosphorus, HCl-P Hydrochloride phosphorus, TP Total Phosphorus, Av-P Available phosphorus, Alk-P Alkaline phosphatase activity, Phy-P Phytin-P.

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