Table 2: Effects of tillage, N application and different seasons on wheat grain water use efficiency (kg grain ha-1 mm-1) *.
| Year | Conventional till (CT) | No-till (NT) | Year mean | ||
| No N added (N0) | 75 kg N ha-1 (N75) | No N added (N0) | 75 kg N ha-1 (N75) | ||
| 1992 | 16.54 | 17.36 | 17.39 | 19.35 | 17.66 |
| 1993 | 9.20 | 9.90 | 9.90 | 10.80 | 9.95 |
| 1994 | 4.81 | 7.61 | 5.35 | 6.85 | 6.16 |
| 1995 | 6.26 | 4.29 | 6.53 | 7.06 | 6.04 |
| 1996 | 8.49 | 13.10 | 7.38 | 12.63 | 10.40 |
| Mean | 9.06 | 10.45 | 9.31 | 11.34 | 10.04 |
*Treatment effects: least significant difference at P < 0.05; year, 1.00; N, 0.71; year × N, 1.42. Tillage, and year × tillage, tillage × N and year × tillage × N interactions were not significant.