Table 3 Comparison of carbon emissions from China and other countries.
Crop | Country | Carbon emissions per unit yield | Contribution of nitrogen fertiliser | Reference |
|---|---|---|---|---|
kg ce/kg | ||||
Maize | United States | 0.12–0.25 | 45–75% | Snyder et al.22 |
China | 0.95 (0.41–0.85) | 40% (32–49%) | This study | |
Wheat | United States | 0.25–0.35 | 67–75% | Snyder et al.22 |
India | 0.12 | 75% | Pathak et al.66 | |
Canada | 0.27–0.50 | — | Gan et al.67 | |
China | 1.26 (0.21–1.30) | 28% (13–33%) | This study | |
Rice | India | 1.2–1.5 | <10% | Pathak et al.66 |
China | 2.10 (0.72–2.74) | 15% (8–40%) | This study |
