Table 7.
Water and nitrogen utilization efficiency of different treatments.
| Years | Treatment | Irrigation water (mm) |
Nitrogen application(kg.ha-1) | ET (mm) |
IWP (kg ha-1 mm−1) |
WP (kg ha-1 mm−1) |
NPP (kg.kg−1) |
NAE (kg.kg−1) |
|---|---|---|---|---|---|---|---|---|
| 2020-2021 | CK | 200 | 180 | 382.2a | 39.6c | 20.7c | 43.9c | 6.7c |
| I1 | 200 | 180 | 342.7b | 40.6b | 23.7b | 45.1b | 7.2b | |
| I2 | 200 | 180 | 339.6c | 42.5a | 25.0a | 47.2a | 7.7a | |
| 2021-2022 | CK | 200 | 180 | 387.9a | 40.4c | 20.8c | 44.9c | 6.3c |
| I1 | 200 | 180 | 339.8b | 41.6b | 24.5a | 46.2b | 6.7b | |
| I2 | 200 | 180 | 340.9b | 42.5a | 24.9a | 47.2a | 7.2a |
Different letters within a column imply significant differences between different treatments at P< 0.05. CK: traditional irrigation and fertilization methods; I1: surface drip fertilization; I2: underground drip fertilization. WP, water productivity; IWP, irrigation water productivity; NPP, nitrogen partial productivity; NAE, nitrogen agronomic efficiency.