Residual Nitrogen Contributions from Grain Legumes to the Growth and Development of Succeeding Maize Crop

Table 1

Physicochemical properties of soil of experimental site before planting and after harvesting in 2008 at Samaru.

Before planting in 2008		After harvesting in 2008
Soil characteristics		pH ratio 1: 2.5
		Soil samples	Textural class	H2O	0.01 m CaCl2	Total N (%)	CEC
Particle size (%)
Sand	52	M0	Loam	5.00	4.45	0.13	3.40
Silt	40	M1	Loam	5.00	4.50	0.13	4.30
Clay	08	M2	Loam	4.80	4.50	0.12	4.10
Textural Class	Loam	M3	Loam	4.70	4.50	0.12	4.40
Chemical composition
pH in water	5.10	Soybean plot	Loam	5.00	4.40	0.29	4.80
Organic carbon (%)	0.50	Cowpea plot	Loam	5.00	4.80	0.38	5.20
Total nitrogen (%)	0.14	Lablab plot	Loam	5.20	4.40	0.49	6.80
Available phosphorus (%)	2.44	g. nut plot	Loam	4.80	4.40	0.42	6.40
		fallow plot	Loam	5.00	4.70	0.26	4.10
Exchangeable bases
Ca	0.60
Mg	0.08
K	0.21
Na	0.36
H + Al	0.40
CEC	3.20

Key
M_o: Maize plot without nitrogen fertilizer.
M₁: Maize plot with 40 kg N ha⁻¹.
M₂: Maize plot with 80 kg N ha⁻¹.
M₃: Maize plot with 120 kg N ha⁻¹.