Table 2.
Soil extractable nitrate at 0 to 400 cm and soil N2O emissions from N fertilizer application treatments.
| Treatment | Lysimeter leached (kg N ha−1 yr−1) |
Deep Soil NO3− stock (kg N ha−1) |
NO3− leached to deep soil (kg N ha−1 yr−1) |
Maize N2O emission (kg N ha−1 yr−1) |
N2O emission factor (%) |
|---|---|---|---|---|---|
| 0 | 0.21a (0.03) |
218a (10.4) |
0 | 0.27a (0.04) |
N.A. |
| 80 | 0.28a (0.10) |
285a (49.4) |
68.5 (48.9) |
0.45ab (0.09) |
0.23 |
| 120 | 0.18a (0.04) |
328a (38.0) |
88.0 (28.7) |
0.38ab (0.07) |
0.10 |
| 160 | 0.23a (0.04) |
382a (61.8) |
144 (62.0) |
0.58ab (0.07) |
0.20 |
| 200 | 0.28a (0.06) |
426a (89.0) |
148 (75.5) |
0.75b (0.17) |
0.24 |
Treatments with different lettered superscripts differ significantly based on a post-hoc Tukey HSD test. Values in parentheses are standard errors.