| Amount nutrient Applied (kg/ha) | Harvest Index | |||||
| Salima | Dedza | Lilongwe | ||||
| Mean | Change | Mean | Change | Mean | Change | |
| 0K, 0P | 0.39 | 0.35 | 0.41 | |||
| 0K, 7.5P | 0.44 | 0.04 | 0.47 | 0.12* | 0.44 | 0.03 |
| 0K, 15P | 0.44 | 0.04 | 0.45 | 0.10* | 0.44 | 0.03 |
| 0K, 22.5P | 0.46 | 0.06* | 0.42 | 0.07 | 0.43 | 0.02 |
| 20k, 0p | 0.42 | 0.02 | 0.42 | 0.07 | 0.44 | 0.03 |
| 20k, 7.5p | 0.43 | 0.03 | 0.44 | 0.10* | 0.43 | 0.02 |
| 20k, 15p | 0.42 | 0.03 | 0.46 | 0.10* | 0.43 | 0.02 |
| 20k, 22.5p | 0.44 | 0.05 | 0.47 | 0.12* | 0.40 | −0.02 |
| 15P, 10K | 0.44 | 0.04 | 0.47 | 0.12* | 0.45 | 0.04 |
| 15P, 30K | 0.43 | 0.03 | 0.44 | 0.09* | 0.40 | −0.01 |
| Diagnostic | 0.42 | 0.03 | 0.44 | 0.09* | 0.40 | −0.01 |
| CV (%) | 12.08 | 12.77 | 12.13 | |||
| P (0.05) | 0.38 | 0.00 | 0.08 | |||
| Critical D Value | 2.77 | 2.78 | 2.76 | |||