Average composition (percent on dry matter) of the mixed compost added to the planting pit.
| Parameter | Value in organic compost used | Limit values (according to Italian Legislation) |
|---|---|---|
| Humidity | 13.9% | Maximum 50 |
| pH | 6.3 | 6.0–8.5 |
| Total nitrogen | 1.95% | — |
| Organic carbon | 26.1% | Maximum 25 |
| Organic matter | 45% | — |
| C/N ratio | 13.4 | Maximum 25 |
| Total phosphorus P2O5 | 0.37% | — |
| Potassium exchangeable K2O | 1.00% | — |
| Plastic materials (less than 3.3 mm [0.13 in]) | 0.3% | Maximum 0.45 |
| Total of inert material | 0.7% | Maximum 0.9 |