The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

Table 1

Some selected chemical and physical characteristics of the soils at Nyabeda and Khwisero.

Parameter	Nyabeda	Khwisero
pH (1 : 2.5 soil : water)	5.40	5.20
Exchangeable acidity (cmolc k g^−1)	0.10	1.00
Organic carbon %	1.58	1.75
Exchangeable Ca (cmolc kg^−1)	4.65	3.53
Exchangeable Mg (cmolc kg^−1)	1.90	1.25
Exchangeable K (cmolc kg^−1)	0.09	0.07
Olsen extractable P (mg kg^−1)	3.9	4.4
P sorption at P conc. of 0.2 mg P L^−1	316	375
Clay (%)	55	35
Sand (%)	25	45
Silt (%)	20	20
Textural class	Clay loam	Sandy clay loam