Phosphorus Adsorption and Its Correlation with Physicochemical Properties of Volcanic-Influenced Soils of Meupi-Awing in Northwest Cameroon

Table 1

Selected physicochemical properties of the soils.

Sample	pH (H2O)	pH (KCl)	∆pH	EC (mS/cm)	%OC	%OM	%N	C/N	Na^+(cmolc/kg)	K^+(cmolc/kg)	Ca^2+(cmolc/kg)
MWC	5.0	4.0	−1.0	0.03	2.99	5.16	0.141	21	0.52	0.73	4.4
MWV	4.7	3.8	−0.2	0.02	3.55	6.12	0.167	22	0.71	1.96	4.08
MEC	5.1	4.1	−1.0	0.02	4.03	6.96	0.183	22	0.52	0.51	4.88
MEV	5.0	4.1	−0.9	0.01	4.17	7.20	0.224	19	0.52	1.21	3.6
Sample	Mg^2+(cmolc/kg)	SB (cmolc/kg)	CEC (cmolc/kg)	Avail. P (mg/kg)	EA (cmolc/kg)	%Sand	%Silt	%Clay	A-Fe (mg/g soil)	Free Fe (mg/g soil)	A-Al (mg/g soil)	Free Al (mg/g soil)
MWC	1.36	7.01	31.84	5.81	0.26	66.5	25.0	8.5	0.01	3.50	0.21	2.51
MWV	1.12	7.89	27.76	6.19	0.26	55.5	27.0	17.5	0.61	8.35	0.87	7.00
MEC	2.00	7.90	43.04	5.47	0.25	65.0	33.5	11.5	0.00	3.66	0.82	2.52
MEV	1.28	6.60	40.64	6.97	0.25	55.5	35.0	9.5	0.51	8.31	0.38	7.50

ΔpH = net charge (pH KCl–pH H₂O), EC = electrical conductivity, OC = organic carbon, OM = organic matter, N = total nitrogen, C/N = mineralization, MWC = Meupi West Cultivated, MWV = Meupi West Virgin, MEC = Meupi East Cultivated, MEV = Meupi East Virgin, SB = sum of bases, CEC = cation exchange capacity, Avail. P = available phosphorus, A-Fe = amorphous iron, and A-Al = amorphous aluminium.