Table 6.

Sum of squares, mean squares and F statistics from Analysis of Covariance indicating the sources of variation in grain yields of legumes and maize under different spatial arrangement and selected measured soil properties in the southern Guinea savanna (SGS) and northern Guinea savanna (NGS) of northern Ghana.

	SGS					NGS
Source of variation	d.f.	s.s.	m.s.	v.r.	F pr.	d.f.	s.s.	m.s.	v.r.	F pr.
Block stratum	Cowpea
Covariates	2	1.43	0.71	40.5	<0.001	2	5.03	2.51	178.08	<0.001
Total N	1	0.03	0.03	1.58	0.24	1	5.02	5.02	355.36	<0.001
Avail. P	1	1.40	1.40	79.41	<0.001	1	0.01	0.01	0.81	0.393
Residual	9	0.16	0.02	1.3		9	0.13	0.01	0.48
Block.*Units* stratum
Arrangement	3	2.01	0.67	49.33	<0.001	3	1.15	0.38	13.1	<0.001
Residual	33	0.45	0.01			33	0.97	0.03
Total	47	4.04				47	7.28
Block stratum	Soybean
Covariates	2	2.88	1.44	25.19	<0.001	2	5.92	2.96	97.57	<0.001
Total N	1	1.69	1.69	29.58	<0.001	1	5.92	5.92	195.06	<0.001
Avail. P	1	1.19	1.19	20.81	0.001	1	0.00	0.00	0.09	0.773
Residual	9	0.51	0.06	1.31		9	0.27	0.03	1.05
Block.*Units* stratum
Arrangement	3	8.92	2.97	68.07	<0.001	3	1.79	0.60	20.67	<0.001
Residual	33	1.44	0.04			33	0.95	0.03
Total	47	13.75				47	8.94
Block stratum	Groundnut
Covariates	2	0.17	0.09	12.07	0.003	2	0.16	0.08	19.95	< 0.001
Total N	1	0.04	0.034	5.52	0.043	1	0.14	0.14	34.72	< 0.001
Avail. P	1	0.13	0.13	18.63	0.002	1	0.02	0.02	5.17	0.049
Residual	9	0.06	0.01	1.93		9	0.04	0.00	1.05
Block.*Units* stratum
Arrangement	3	0.69	0.23	63.15	< 0.001	3	0.26	0.09	22.82	< 0.001
Residual	33	0.12	0.00			33	0.13	0.00
Total	47	1.05				47	0.58
Block stratum	Maize
Covariates	2	0.79	0.39	7.33	0.013	2	4.86	2.43	92.64	<0.001
Total N	1	0.08	0.08	1.55	0.245	1	4.17	4.17	158.82	<0.001
Avail. P	1	0.71	0.71	13.11	0.006	1	0.69	0.69	26.46	<0.001
Residual	9	0.48	0.05	0.99		9	0.24	0.03	1.12
Block.*Units* stratum
Arrangement	3	7.26	2.42	44.45	<0.001	3	2.20	0.73	31.31	<0.001
Residual	33	1.80	0.05			33	0.77	0.02
Total	47	10.33				47	8.07