Applied and Environmental Soil Science

Research Article

Assessment and Characterization of Agricultural Salt-Affected Soils around Abaya and Chamo Lakes, South Ethiopia Rift Valley

Table 7

Salt-affected soils principal component analysis (PCA) of soil properties.


Loading matrix					Formatted loading matrix
PCA	Dim. 1	Dim. 2	Dim. 3	Dim. 4	PCA	Dim. 1	Dim. 2	Dim. 3	Dim. 4

Eigenvalue	11.33	3.44	2.41	1.66	Eig. V	11.33	3.44	2.41	1.66
Variance (%)	49.28	14.97	10.49	7.25	V (%)	49.28	14.97	10.49	7.25
Cumulative variance (%)	49.28	64.26	74.75	82.01	C. V (%)	49.28	64.26	74.75	82.01

pH	0.71	−0.50	0.29	−0.14	Na⁺	0.94	−0.19	0.04	−0.15
EC	0.90	0.22	0.07	−0.25	Ex. Na	0.90	−0.35	−0.19	0.14
Ex. Na	0.90	−0.35	−0.19	0.14	EC	0.90	0.22	0.07	−0.25
Ex. K	0.36	0.55	0.49	0.41	SAR	0.88	−0.31	−0.34	0.00
Ex. Ca	−0.51	0.48	−0.08	−0.01	ESP	0.88	−0.31	−0.34	0.00
Ex. Mg	−0.58	0.45	0.16	0.33	NO₃⁻	0.85	0.29	−0.16	−0.23
CEC	0.77	0.40	−0.39	−0.06	Av. P	0.82	0.17	0.15	0.11
BS	0.69	−0.52	−0.05	0.39	SO₄⁻²	0.79	0.36	−0.23	−0.07
Av. P	0.82	0.17	0.15	0.11	K⁺	0.78	0.07	0.15	0.49
OC	0.69	0.64	−0.04	0.26	CEC	0.77	0.40	−0.39	−0.06
OM	0.69	0.64	−0.04	0.26	pH	0.71	−0.50	0.29	−0.14
TN	−0.57	−0.19	0.29	0.40	OC	0.69	0.64	−0.04	0.26
CaCO₃	0.43	−0.21	0.67	0.08	OM	0.69	0.64	−0.04	0.26
SAR	0.88	−0.31	−0.34	0.00	BS	0.69	−0.52	−0.05	0.39
ESP	0.88	−0.31	−0.34	0.00	Ex. K	0.36	0.55	0.49	0.41
Na⁺	0.94	−0.19	0.04	−0.15	Ex. Mg	−0.58	0.45	0.16	0.33
K⁺	0.78	0.07	0.15	0.49	Ca²⁺	0.36	0.15	0.76	−0.29
Ca²⁺	0.36	0.15	0.76	−0.29	CaCO₃	0.43	−0.21	0.67	0.08
Mg²⁺	−0.76	0.19	−0.15	−0.13	HCO₃^-	0.44	−0.05	0.61	−0.45
Cl⁻	−0.06	−0.64	0.05	0.45	Cl⁻	−0.06	−0.64	0.05	0.45
SO₄⁻²	0.79	0.36	−0.23	−0.07	Ex. Ca	−0.51	0.48	−0.08	−0.01
NO₃⁻	0.85	0.29	−0.16	−0.23	TN	−0.57	−0.19	0.29	0.40
HCO₃⁻	0.44	−0.05	0.61	−0.45	Mg²⁺	−0.76	0.19	−0.15	−0.13

NB. The values in nonbold represent essential contributions that are above the expected value if the contributions were uniform.