Soil Fertility, Phosphorus Fractions, and Maize Yield as Affected by Poultry Manure and Single Superphosphate

Table 10

Correlation coefficient () among P fractions, soil chemical properties, and maize grain yield in 2008.

Soil properties	P fractions (mg kg^−1)
	Organic P	Fe-P	Occluded P	Residual P
pH	0.118	0.458	0.065	−0.144
Available P	0.053	0.173	−0.753	0.048
Organic C	0.500	0.122	−0.557	−0.177
Grain yield	0.403	0.105	0.123	0.412