Effects of Organic and Inorganic Materials on Soil Acidity and Phosphorus Availability in a Soil Incubation Study

Table 1

Initial surface (0–15 cm) soil properties.

Parameter	Bukura	Kakamega
pH (H2O) (1 : 2.5)	4.80	5.10
Exchangeable acidity (cmolc kg^−1)	0.88	0.35
Exchangeable Al (cmolc kg^−1)	0.63	0.13
Ca	1.94	2.1
Mg	1.01	1.8
K	0.12	0.2
ECEC	3.95	4.85
Al saturation (%)	22	7.2
Organic C (%)	3.2	2.7
Total N (%)	0.3	0.3
C : N ratio	10.6	9.0
Total P (%)	0.04	0.03
Olsen P (mg kg^−1)	5.6	2.5
P sorbed at (0.2 mg kg^−1)	260	45
Texture (%)
Sand	52	54
Silt	18	28
Clay	30	18
Soil classification (FAO System)	Orthic ferralsol	Ferralic cambisols