Table 3.

Effect of legume-cereal rotation, residue incorporation and N rates on chemical properties of the soil.

Treatments	pH	OC %	N %	P mg kg−1	Ca	Mg	K	EA	ECEC
					cmol kg−1
2008
Velvet bean-Maize	6.17	1.49	0.19	7.70	1.75	1.0	0.24	0.08	3.18
Cowpea-maize	6.55	1.26	0.17	4.2	1.95	0.84	0.19	0.11	3.22
Soybean-Maize	6.53	1.50	0.19	6.9	1.93	0.84	0.21	0.12	3.19
Maize-maize	6.74	1.29	0.16	6.07	1.91	0.83	0.18	0.16	2.31
LSD (0.05)	0.28**	0.19*	0.02**	1.65**	ns	0.16*	ns	0.03**	0.59**
N application
0 kg N ha−1	6.48	1.37	0.16	6.07	1.89	0.83	0.22	0.11	3.27
60 kg N ha−1	6.51	1.39	0.18	6.38	1.88	0.92	0.19	0.11	3.12
LSD (0.05)	ns	ns	0.01**	ns	ns	ns	ns	ns	ns
Residue management
Residue incorporated	6.57	1.41	0.19	5.89	1.93	0.86	0.19	0.12	3.20
Residue not incorporated	6.43	1.37	0.16	6.56	1.85	0.9	0.22	0.11	3.19
LSD (0.05)	ns	ns	0.01**	ns	ns	ns	ns	ns	ns
Velvet bean-Maize	6.78	1.48	0.27	2009 12.38	3.14	1.19	0.31	0.03	4.83
Cowpea-maize	6.68	1.43	0.18	14.10	2.77	1.03	0.32	0.07	4.30
Soybean-Maize	6.78	1.51	0.19	9.31	2.92	1.12	0.31	0.10	4.52
Maize-maize	6.80	1.51	0.13	8.91	2.84	1.14	0.30	0.06	4.46
LSD (0.05)	ns	ns	0.06**	ns	ns	ns	ns	ns	ns
Nitrogen application
0 kg N ha−1	6.82	1.41	0.17	12.57	2.91	1.13	0.32	0.05	4.54
60 kg N ha−1	6.69	1.40	0.22	9.79	2.92	1.11	0.30	0.08	4.51
LSD (0.05)	0.1*	ns	0.04*	ns	ns	ns	ns	ns	s
Residue management
Residue incorporated	6.83	1.47	0.21	12.83	2.90	1.08	0.31	0.18	4.47
Residue not incorporated	6.69	1.49	0.18	9.52	2.94	1.16	0.31	0.17	4.58
LSD (0.05)	0.10**	ns	ns	ns	ns	ns	ns	ns	ns

*significant at 5%, **highly significant at 1%, ns- not significant.