Response of Sorghum bicolor L. to Residual Phosphate on Two Contrasting Soils Previously Planted to Cowpea or Maize

Table 1

Precropping properties of the soils used.

Properties	Soil test values
	Okemesi; (Strongly acidic soil)	Gambari; (Slightly acidic soil)
pH (1 : 1 soil/water ratio)	5.3	6.7
Bray-1-P (mg/kg)	5	9
Total N (g/kg)	2.0	2.0
Organic matter (g/kg)	27.1	26.5
Exchangeable cations (cmol/kg)
K	0.2	0.3
Ca	1.6	1.8
Mg	0.7	0.7
Na	0.1	0.1
Exchangeable micronutrient (g/kg)
Fe	0.3	0.2
Mn	0.3	1.3
Exchangeable acidity (cmol/kg)	0.4	0.6
Sand (g kg^−1)	628.0	871.0
Silt (g kg^−1)	150.0	40.0
Clay (g kg^−1)	222.0	89.0
Texture	Sandy clay loam	Loamy sand