| System | Mulching rate (t/ha) | Tuber weight (1000 kg/ha) | Total weight of tubers (1000 kg/ha) | ||||
| Marketable | Non-marketable | ||||||
| Till | 0 | 9 | c | 34 | a | 42 | b |
| No-Till | 25 | 20 | b | 27 | ab | 47 | b |
| No-Till | 50 | 28 | a | 28 | ab | 56 | a |
| No-Till | 75 | 31 | a | 21 | b | 52 | ab |