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| Index | Turning point | |
|---|---|---|
| x 1 | x 2 | |
| pH | 4.5 | 5.5 |
| SOM/g kg−1 | 5 | 20 |
| AN/mg kg−1 | 30 | 120 |
| AP/mg kg−1 | 20 | 90 |
| AK/m g kg−1 | 60 | 150 |
Notes.
SOM, soil organic matter; AN, alkali-hydrolyzable N; AP, available P; AK, available K.
