Abstract:

In this paper, maximum increase of rice yield in different times in China was analyzed from the following three aspects: the potential of light use efficiency, the tendency of yield variation in the past and yield potential by Chinese farming systems zoning based on AEZ model. Maximum increase of rice yield in different times in China was by 10% before 1977, by 9% before 1980, by 8% before 1986, by 7% before 1990, by 6% before 1996 and by 5% before 2003. Any rice cultivar whose yield increase by over above rate must be narrowly extended or untruly statistical, so does any cultivation of rice. The result is valuable to rice production in China.