Occurrence of different levels of compacted soil (determined by the depth to which a 10-mm-diameter, 1-m-long steel spike could be inserted into the soil) surrounding each Eucalyptus leucoxylon tree (n = 300).
| Soil compaction | Number of trees | Frequency (%) |
|---|---|---|
| Impenetrable | 5 | 1.7 |
| Firm | 123 | 41.0 |
| Medium | 98 | 32.7 |
| Soft | 40 | 13.3 |
| Very soft | 34 | 11.3 |