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

Table 9

Correlation coefficient () among P fractions, soil chemical properties, and maize grain yield in 2007.

Soil properties	P fractions (mg kg^−1)
	Organic P	Fe-P	Occluded P	Residual P
pH	0.098	0.201	−0.550	0.633
Available P	0.514	0.433	−0.528	−0.071
Organic C	0.206	0.115	−0.031	−0.105
Grain yield	0.413	0.145	0.034	0.402