Plant | Type | 3-March | 31-March | 18-April | 12-May |
| Radish | Broadleaf | 77.3ca | 65.0b | 95.8ab | 96.4a |
| Crimson clover | Broadleaf | 43.5d | 19.3d | 56.5d | 69.8b |
| Hairy vetch | Broadleaf | 19.0e | 29.8c | 79.8c | 93.9a |
| Winter pea | Broadleaf | 82.2c | 97.5a | 93.8ab | 89.9a |
| Italian Ryegrass | Grass | 98.1a | 100.0a | 99.4a | 100.0a |
| Rye | Grass | 91.5ab | 100.0a | 90.0b | 92.8a |
| F(7,21) |
| 79.6 | 400.4 | 33.5 | 6.1 |
| PF |
| <0.0001 | <0.0001 | <0.0001 | 0.0006 |
| LSD (0.05) |
| 9.1 | 5.0 | 7.0 | 10.9 |