| Treatment |
| Protein Concentration in Seed (g∙kg−1) | ||||
| No. | S Source/Time/Method |
| 2011 | 2012 | 2013 | Mean |
| 1 | Control (no S fertilizer) |
| 225 | 232 | 216 | 224 |
| 2 | RRES Broadcast Autumn |
| 224 | 234 | 208 | 222 |
| 3 | RRES Broadcast Spring Pre-Till |
| 229 | 232 | 215 | 225 |
| 4 | RRES Broadcast Spring Pre-Emergence |
| 222 | 226 | 222 | 223 |
| 5 | RRES Spring Sideband |
| 223 | 227 | 222 | 225 |
| 6 | RRES Spring Seedrow-Placed |
| 226 | 231 | 218 | 225 |
| 7 | Potassium Sulphate Broadcast Autumn |
| 224 | 236 | 210 | 223 |
| 8 | Potassium Sulphate Broadcast Spring Pre-Till |
| 220 | 234 | 211 | 222 |
| 9 | Potassium Sulphate Broadcast Spring Pre-Emergence |
| 218 | 236 | 207 | 221 |
| 10 | Potassium Sulphate Spring Sideband |
| 225 | 228 | 220 | 224 |
| 11 | Potassium Sulphate Spring Seedrow-Placed |
| 219 | 245 | 213 | 226 |
|
| LSD0.05 |
| 9 | 8 | 23 | 9 |
|
| |
| 3.1 ns | 2.6** | 8.1ns | 3.3ns |