Assessing Soil Nutrients Variability and Adequacy for the Cultivation of Maize, Cassava, and Sorghum in Selected Agroecological Zones of Cameroon

Table 11

Spearman rank order correlations of measured chemical properties for soil samples in the Adamawa region.

	TEC	pH	OM	ENR	S	P	Ca	Mg	K	Na	B	Fe	Mn	Cu	Zn	Al
TEC	1
pH	−0.098	1
OM	0.212	−0.579	1
ENR	0.227	−0.594	0.996	1
S	0.052	−0.686	0.520	0.528	1
P	0.415	0.208	−0.161	−0.163	−0.022	1
Ca	0.791	0.354	−0.188	−0.181	−0.208	0.554	1
Mg	0.644	0.445	−0.239	−0.217	−0.377	0.225	0.671	1
K	0.202	0.145	0.013	0.029	−0.012	0.125	0.087	0.390	1
Na	0.633	−0.389	0.479	0.503	0.520	0.287	0.281	0.161	0.105	1
B	−0.194	0.500	0.201	0.245	−0.299	−0.064	0.140	−0.122	−0.073	−0.059	1
Fe	0.017	0.596	−0.403	−0.398	−0.370	0.500	0.376	0.244	−0.013	−0.027	0.180	1
Mn	−0.029	0.664	−0.814	−0.813	−0.633	0.223	0.390	0.446	0.043	−0.418	−0.049	0.422	1
Cu	0.266	−0.045	0.560	0.570	0.131	0.133	0.267	0.074	−0.054	0.284	0.511	0.125	−0.239	1
Zn	0.486	0.203	0.314	0.314	−0.200	0.429	0.429	0.429	0.314	0.754	0.500	0.771	−0.543	0.086	1
Al	0.455	−0.542	0.468	0.470	0.511	0.005	0.093	0.050	0.154	0.580	−0.249	−0.439	−0.432	−0.058	0.029	1

Correlation is significant at the 0.01 level (2-tailed); correlation is significant at the 0.05 level (2-tailed); total number of soil samples n = 32; S (n = 28); P (n = 30); B (n = 10); Zn (n = 6); OM (%); TEC (meq/100 g); ENR (lbs acre⁻¹); S (ppm); P (mg kg⁻¹); Ca (mg kg⁻¹); Mg (mg kg⁻¹); K(mg kg⁻¹); Na(mg kg⁻¹); B (mg kg⁻¹); Fe (mg kg⁻¹); Mn (mg kg⁻¹); Cu (mg kg⁻¹); Zn (mg kg⁻¹); Al (mg kg⁻¹).