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The selected variables and principal component number.
| Soil Type | Temperature | Selected Variables Number | Principal Component Number |
|---|---|---|---|
| Loess | 50 °C | 20 | 5 |
| 80 °C | 40 | 6 | |
| 95 °C | 19 | 3 | |
| 25 °C | 29 | 3 | |
| Calcium soil | 50 °C | 18 | 3 |
| 80 °C | 26 | 5 | |
| 95 °C | 20 | 5 | |
| 25 °C | 14 | 3 | |
| Black soil | 50 °C | 21 | 5 |
| 80 °C | 11 | 5 | |
| 95 °C | 42 | 6 | |
| 25 °C | 32 | 5 |
