| Treatments | Months after sowing | ||||
| 1 | 2 | 3 | 4 | 5 | |
| 1.0 m apart | 0.46 | 0.54 | 0.56 | 0.63 | 0.66 |
| 1.5 m“ | 0.47 | 0.55 | 0.60 | 0.72 | 0.75 |
| 2.0 m“ | 0.51 | 0.64 | 0.66 | 0.78 | 0.80 |
| 2.5 m“ | 0.52 | 0.64 | 0.70 | 0.80 | 0.81 |
| 3.0 m“ | 0.55 | 0.67 | 0.79 | 1.04 | 1.06 |
| Control | 0.54 | 0.66 | 0.77 | 0.84 | 0.86 |
| LSD (p < 0.05) | 0.04 | 0.06 | 0.10 | 0.14 | 0.14 |