| Irrigation regimes | *Tubers number/m2 | *Tuber weight (g) | ||
| 2010 | 2011 | 2010 | 2011 | |
| I30 | 17.50 ± 1.14 | 20.70 ± 1.77 | 61.47 ± 3.70 | 66.5 ± 3.44 |
| I60 | 22.00 ± 2.01 | 24.50 ± 1.93 | 75.79 ± 2.91 | 81.22 ± 3.10 |
| I100 | 24.50 ± 2.12 | 27.75 ± 2.40 | 93.32 ± 3.04 | 99.77 ± 3.12 |
| LSD (5%) | 1.677 | 1.911 | 3.993 | 4.001 |
| Nitrogen levels (kg/ha) |
|
|
|
|
| No | 18.00 ± 0.70 | 19.75 ± 1.32 | 68.72 ± 4.72 | 72.61 ± 2.66 |
| N100 | 19.50 ± 2.20 | 21.62 ± 1.57 | 77.09 ± 2.95 | 80.80 ± 2.81 |
| N200 | 21.50 ± 3.17 | 23.96 ± 2.11 | 87.21 ± 4.1 | 93.50 ± 3.26 |
| N300 | 23.70 ± 1.51 | 25.95 ± 1.33 | 93.31 ± 3.61 | 96.33 ± 3.75 |
| LSD (5%) | 1.447 | 1.733 | 4.621 | 5.211 |