| Treatment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Biofertiliser (K solubilising bacteria) | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 |
| Mineral K (Muriate of potash) | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| Manure | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |