|
| 2005 | 2006 | 2007 | 2008 | 2009 | |
| Harvest system‡ | L | L | L | U | L/U | L/U |
| Control | --- | --- | --- | --- | --- | 7.5 |
| 1 | 6.2 | 4.5 | 5.5 | 7.5 | 6.3 | 8.7 |
| 2 | 10.5 | 8.2 | 6.1 | 9.5 | 8.2 | 10.1 |
| 3 | 9.9 | 8.5 | 7.2 | 10.1 | 8.6 | 10.6 |
| LSD (0.05) | 1.1 | 1.4 | 1.0 | 1.8 | 1.2 | 0.9 |