On-Farm Experimentation with Improved Maize Seed and Soil Amendments in Southern Ghana: Productivity Effects in Small Holder Farms

Table 4

Chemical and physical properties of soil at 0–15 cm and 15–30 cm soil depths of the coastal savannah and semi deciduous forest zones of Ghana used for the study.

Soil properties	Agroecological zone
	Coastal savannah (CSZ)				Semi deciduous forest zone (SDFZ)
	0–15 cm	15–30 cm			0–15 cm		15–30 cm
Chemical properties
pH (H2O) (1 : 2.5)	6.64		6.62	6.18			5.19
Total N (%)	0.07		0.04	0.10			0.07
Av. P (mg/kg)	19.76		15.81	21.39			19.45
Av. K (mg/kg)	21.77		13.95	27.91			23.15
Organic M (%)	1.35		0.85	2.06			1.48
Ex. Ca (Cmolc kg^−1)	3.73		3.27	4.40			3.80
Ex. Mg (Cmolc kg^−1)	1.87		2.33	2.13			2.47
Ex. K (Cmolc kg^−1)	0.19		0.15	0.19			0.20
Ex. Na (Cmolc kg^−1)	0.51		0.46	0.45			0.55
Ex. Acidity (Cmol (+) kg^−1	0.13		0.15	0.12			0.14
ECEC (Al^3+ + H^+).(Cmolc (+) kg^−1)	6.43		6.36	7.29			7.16
Base saturation (%)	97.98		97.64	98.35			98.04
Physical characteristics
Sand%	78.67				76.33
Silt%	16.00				17.00
Clay%	5.33				6.67
Textural class	Loamy sand				Sandy loam