Table 1. Meteorological data in 2009, 2010, and 2011.
| Meteorological factors | 2009 | 2010 | 2011 |
| Rainfall during the whole growing period (mm) | 1489.4 | 1845.2 | 1226.9 |
| Accumulated temperature during the whole growing period (°C) | 4035.1 | 3889.0 | 4021.4 |
| Sunshine hours during the whole growing period (h) | 525.4 | 523.4 | 672.9 |
| Rainfall during heading-maturing stage (mm) | 323.1 | 952.4 | – |
| Accumulated temperature during heading-maturing stage (°C) | 588.9 | 1263.8 | – |
| Sunshine hours during heading-maturing stage (h) | 81.6 | 189.7 | – |
| Rainfall during 30 d after heading (mm) | – | – | 549.4 |
| Accumulated temperature during 30 d after heading (°C) | – | – | 795.5 |
| Sunshine hours during 30 d after heading (h) | – | – | 181.6 |