Annual crops will be affected by the increases in globally mean surface air temperatures of 1.4-5.8℃towards the end of the 21st century. China seems to have become more temperate, and the most crowded areas show a clear warming trend. Therefore, it is very important that rice production of China contributes not only to food safety of China but also to that of the world. We analyzed weather data at Meteorological Bureau in Hunan Province from 1999 to 2008 to examine temperature trends and the relationship between rice grain yields by using data...
