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