Explaining the Soil Quality Using Different Assessment Techniques

Table 6

Principal component analysis (PCA) of factor loadings for lands in the Nitisols and Luvisols.

Parameters	Nitisols					Luvisols
	PC_1	PC_2	PC_3	PC_4	PC_5	PC_1	PC_2	PC_3	PC_4	PC_5
Eigenvalues	7.432	3.892	2.848	1.668	1.114	6.869	3.125	2.381	1.756	1.274
% Of variance	39.1	20.5	15	8.8	5.9	36.2	16.4	12.5	9.2	6.7
Cumulative % of variance	39.1	59.6	74.6	83.4	89.3	36.2	52.6	65.1	74.3	81
PC weight	0.43785	0.22956	0.16797	0.09854	0.06607	0.447	0.202	0.154	0.114	0.083
Variables	Factor loadings/eigenvectors/					Factor loadings/eigenvectors/
Silt	0.1291	0.1314	0.3148	0.4341	−0.2157	0.111	−0.196	−0.45	0.195	0.249
Clay	−0.0595	−0.4065	−0.1903	−0.2157	−0.0055	−0.255	0.005	0.254	−0.234	−0.108
pH	0.0445	0.2686	0.2703	−0.4376	0.0463	0.312	−0.004	−0.09	−0.295	−0.123
OC	0.0146	0.4423	−0.121	0.1392	0.2473	0.193	−0.227	0.274	0.318	−0.102
TN	−0.0149	0.4235	−0.1723	0.1188	0.2128	0.162	−0.239	0.291	0.466	−0.009
P	−0.0987	−0.0327	0.1288	0.1388	−0.7388	0.261	−0.023	−0.033	−0.216	0.38
S	0.3508	−0.0067	−0.0956	−0.0678	−0.0229	0.154	−0.073	0.478	0.17	−0.112
Ca	−0.2586	0.0424	0.3586	−0.2331	0.0898	0.305	0.299	−0.114	0.015	−0.089
Mg	0.328	−0.0197	0.076	−0.2664	0.0355	0.192	0.431	0.065	0.062	−0.24
K	0.0031	−0.4074	−0.0598	−0.2039	−0.0125	0.278	−0.125	0.257	−0.288	0.01
Na	0.3405	0.0836	0.011	−0.1313	−0.1562	−0.208	−0.008	−0.013	−0.127	0.048
K : Mg	−0.2288	−0.1279	−0.2951	0.3508	0.0199	0.036	−0.318	0.245	−0.391	0.246
CEC	−0.1546	0.3204	−0.1314	−0.3515	−0.2895	0.254	0.253	0.041	0.218	0.206
PBS	0.0598	−0.2663	0.3784	0.1176	0.4099	0.284	0.236	−0.096	−0.087	−0.307
B	0.3561	−0.0016	−0.0667	−0.0736	−0.0365	0.30	−0.076	0.129	−0.307	−0.195
Cu	0.3322	0.0014	−0.0089	−0.006	−0.1026	0.185	−0.343	−0.234	0.113	−0.181
Fe	−0.3354	0.0179	0.1908	−0.0938	−0.0168	0.307	0.061	−0.098	−0.036	0.307
Mn	−0.3437	0.062	0.0513	−0.1854	−0.0078	−0.056	−0.269	−0.247	−0.089	−0.559
Zn	0.0806	−0.0034	0.5408	0.1514	−0.013	0.227	−0.37	−0.199	0.01	−0.022

NB: bold values under each principal component are highly weighted and italic values are selected in the MDS.