| Source of variation | Degrees of freedom | Middle square | Year | Grain yield (kg·ha−1) | DMS (0.05) |
|
|
|
| 2014 | 5500 | a |
| Treatments | 4 | 13,992,143** | 2012 | 5481 | a |
| Error | 397 | 2,119,845 | 2011 | 4967 | ab |
| Total | 401 |
| 2013 | 4718 | b |
|
|
|
| 2015 | 4646 | b |