| Treatment | Rate (kg ai/ha) | Hilling (WAP) | Average potato height (cm)/10 plants DAP | |||||
| 50 | 70 | 110 | ||||||
| Check | 0 | - | 35.0 | ab | 59.4 | a | 74.6 | ab |
| Hand Weeding | 0 | - | 33.5 | ab | 65.5 | a | 66.0 | b |
| Metrbuzin (M) | 0.35 | - | 31.4 | ab | 70.6 | a | 90.5 | ab |
| M | 0.56 | - | 27.0 | ab | 69.7 | a | 102.2 | a |
| M | 0.75 | - | 21.5 | a | 67.3 | a | 99.4 | ab |
| M | 0 | 6 | 31.8 | ab | 63.5 | a | 93.0 | ab |
| M | 0.35 | 6 | 33.0 | ab | 70.7 | a | 102.8 | a |
| M | 0.56 | 6 | 26.2 | ab | 54.5 | a | 107.2 | a |
| M | 0.75 | 6 | 28.4 | ab | 68.4 | a | 106.7 | a |
| M | 0 | 7 | 37.8 | b | 59.8 | a | 75.1 | ab |
| M | 0.35 | 7 | 30.9 | ab | 72.0 | a | 101.2 | a |
| M | 0.56 | 7 | 29.9 | ab | 65.0 | a | 86.0 | ab |
| M | 0.75 | 7 | 29.3 | ab | 70.0 | a | 101.2 | a |
| M | 0 | 8 | 37.2 | ab | 62.3 | a | 80.3 | ab |
| M | 0.35 | 8 | 31.4 | ab | 69.0 | a | 100.0 | ab |
| M | 0.56 | 8 | 29.4 | ab | 65.6 | a | 93.8 | ab |
| M | 0.75 | 8 | 31.4 | ab | 68.9 | a | 95.0 | ab |