N (kg/ha) | Vegetable fields | Wheat fields | Maize fields |
Chemical fertilizer N | 1117.5 | 156 | 158 |
Manure N | 1060 | 0 | 0 |
Straw N | 0 | 24.43 (all straw returning) | 57.8 (all straw returning) |
Root N | 0 (cleaning root residue) | 6.04 | 9.41 |
Irrigation N [20] | 125 | 12.5 | 12.5 |
N deposition [21] | 28 | 14 | 14 |
Seed N | 0 (transplantation) | 8 | 10 |
Biological N fixation [22] | 15 | 15 | 15 |
Total | 2345.5 | 235.97 | 276.71 |
C:N ratio of the input | 4.18 | 9.94 | 10.36 |