Table 4 Data of principal component analysis (PCA) for soil quality variables.

PCs	PC1	PC2	PC3
Eigen value	19.98	2.82	2.12
Variance (%)	71.36	10.06	7.58
Cumulative variance (%) Eigenvectors	71.36	81.42	89.01
pH	− 0.730	− 0.274	0.174
EC	0.968	0.573	0.097
SAR	− 0.460	0.959	− 0.261
ESP	0.206	0.911	0.011
OM	0.936	0.577	0.234
CEC	− 0.672	0.503	0.477
CCE	0.777	0.239	− 0.298
Total N	− 0.768	0.514	0.308
Available P	0.812	0.238	0.253
Available K	0.273	0.55	− 0.591
Exchangeable Ca	− 0.070	0.259	0.848
Exchangeable Mg	0.351	− 0.192	0.836
Exchangeable K	0.200	0.940	− 0.034
Exchangeable Na	0.371	0.870	0.162
Soluble Ca	0.745	0.468	0.311
Soluble Mg	0.834	0.472	0.135
Soluble K	0.901	− 0.276	− 0.071
Soluble Na	0.695	0.651	− 0.034
Zn-DTPA	0.734	0.639	0.073
Cu-DTPA	0.727	0.591	0.263
Cd-DTPA	0.791	0.351	0.172
Pb-DTPA	0.759	0.622	0.07
Ni-DTPA	0.637	0.734	0.094
Total Zn	0.979	0.587	0.072
Total Cu	0.813	0.548	0.135
Total Cd	0.775	0.586	0.06
Total Pb	0.759	0.576	− 0.193
Total Ni	0.799	0.525	− 0.128

TDS: total data set; MDS: minimum data set; OM: organic matter; CCE: calcium carbonate equivalent; CEC: cation exchange capacity; EC: electrical conductivity; SAR: sodium adsorption ratio; ESP: exchangeable sodium percentage.
Underlined bold font values are considered highly weighted.

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