| Treatment | Rate (kg ai/ha) | Hilling (WAP) | WCVR | Av. weed dry wt/m2 (g) | ||||||
| 50 | 70 | 110 | 135 | |||||||
| Check | 0 | - | 3.0 | c | 0.0 | b | 2.5 | acd | 789.4 | e |
| Hand Weeding | 0 | - | 10.0 | b | 10.0 | a | 10.0 | b | 0.0 | a |
| Metribuzin (M) | 0.35 | - | 8.3 | ab | 8.8 | a | 6.0 | abcd | 62.6 | a |
| M | 0.56 | - | 9.3 | ab | 9.3 | a | 6.5 | abcd | 4.0 | a |
| M | 0.75 | - | 9.0 | ab | 7.8 | a | 5.3 | abcd | 48.0 | a |
| M | 0 | 6 | 1.5 | c | 3.5 | b | 1.0 | cd | 342.6 | b |
| M | 0.35 | 6 | 9.0 | ab | 9.5 | a | 9.8 | b | 16.6 | a |
| M | 0.56 | 6 | 9.1 | ab | 9.5 | a | 8.5 | ab | 38.0 | a |
| M | 0.75 | 6 | 9.8 | ab | 9.8 | a | 8.0 | ab | 2.2 | a |
| M | 0 | 7 | 0.8 | c | 3.5 | b | 0.5 | c | 629.6 | de |
| M | 0.35 | 7 | 8.3 | ab | 8.8 | a | 7.8 | ab | 38.6 | a |
| M | 0.56 | 7 | 9.8 | ab | 9.0 | a | 5.5 | abcd | 12.6 | a |
| M | 0.75 | 7 | 9.4 | ab | 8.8 | a | 7.0 | abd | 6.0 | a |
| M | 0 | 8 | 2.0 | c | 3.3 | b | 3.0 | acd | 654.6 | de |
| M | 0.35 | 8 | 8.5 | ab | 9.0 | a | 5.3 | abcd | 92.0 | ab |
| M | 0.56 | 8 | 9.5 | ab | 10.0 | a | 7.5 | ab | 5.4 | a |
| M | 0.75 | 8 | 9.5 | ab | 9.3 | a | 8.5 | ab | 68.6 | a |