The Characteristics of Weather Yield for Global Crop and Its Relationship with Precipitation

Using the original crop yield (wheat and rice) data and the precipitation data of 150 countries from 1951 to 1991, the characteristics of weather yield for wheat and rice and its relationship with precipitation are analysed. The results show that the weather yield contributes to 3% ~ 14% of total crop yield, and the distributions of proportion between them have obvious regional features. The weather yield obeys normal distribution. There exists the certain law for the long-term of weather yield in regional distribution. The weather yield is in close association with precipitation.