| Target | 1 | 2 | 3 |
| Improvement coefficient of available nitrogen | 1.98 | 1.96 | 1.99 |
| Improvement coefficient of available phosphorus | 1.92 | 1.90 | 1.93 |
| Dry weight of Festuca arundinacea (g∙m−2) | 231.57 | 230.02 | 233.11 |