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| Provinces | Year | Observed(kg/ha) | Predicted(kg/ha) | Relative Error (%) |
| Heilongjiang (HLJ) | 2005 | 6795.7 | 6780.7 | −0.22 |
| 2006 | 6261.3 | 6897.8 | 10.17 | |
| Hunan (HN) | 2005 | 6050.3 | 6337.5 | 4.75 |
| 2006 | 6141.3 | 6441.2 | 4.88 | |
| Jiangxi (JX) | 2005 | 5328.2 | 5545.9 | 4.09 |
| 2006 | 5475.1 | 5634.9 | 2.92 | |
| Sichuan (SC) | 2005 | 7213.0 | 8018.4 | 11.17 |
| 2006 | 6420.7 | 7680.3 | 19.62 | |
| Guangxi (GX) | 2005 | 4953.0 | 5028.98 | 1.53 |
| 2006 | 5088.0 | 5053.44 | −0.68 |
