| N management approaches | Total amount of N added (kg∙ha−1) | Amount of N saved (−)/extra added (+) compared to control (kg∙ha−1) | Rice grain yield (t ha-1) | %Yield increased (+)/decreased (−) over control | Partial factor productivity for N (kg∙grain∙kg-1∙N) | |||
| BRRI dhan29 | Dhani gold | BRRI dhan29 | Dhani gold | BRRI dhan29 | Dhani gold | |||
| BRRI recommended N (control) | 138 | 0 | 6.49 | 6.05 | 0 | 0 | 47.0 | 43.8 |
| Soil analysis based N management | 144 | +6 | 6.63 | 7.08 | +2.16 | +17.02 | 46.0 | 49.2 |
| N management based on agro-ecological zone | 150 | +12 | 6.29 | 7.05 | −3.08 | +16.53 | 41.9 | 47.0 |
| 20 kg∙N∙ha−1 at ≤35 SPAD value | 60 | −78 | 6.65 | 5.19 | +2.47 | −14.21 | 110.8 | 86.5 |
| 30 kg∙N∙ha−1 at ≤35 SPAD value | 90 | −48 | 6.53 | 6.98 | +0.62 | +15.37 | 72.6 | 77.6 |
| 20 kg∙N∙ha−1 at ≤3.0 LCC value | 120 | −18 | 7.34 | 6.87 | +13.1 | +13.55 | 61.2 | 57.3 |
| 30 kg∙N∙ha−1 at ≤3.0 LCC value | 180 | +42 | 6.72 | 7.25 | +3.54 | +19.83 | 37.3 | 40.3 |
| Urea super granule (USG) | 80 | −58 | 6.24 | 6.89 | −3.85 | +13.88 | 78.0 | 86.1 |