Abstract: Based on the data of an in situ long-term paddy field experiment from 1995 to 2005 in Taoyuan County,Hunan Province,the relationship between early and late rice yields and meteorological factors were analyzed to understand the impacts of regional climatic factors on rice yields in the double-cropped rice production.The results showed that the climatic yields of early rice were positively correlated to the effective accumulative temperature above 10℃ from the heading to maturing period.However,the fluctuation of sunshine duration and variation of average daily minimum temperature during the growing period were the main causes for the great inter-annual undulation of the climatic yield of late rice.Based on the research results,corresponding cultivation measures were put forward.

Key words: Double-cropped rice, Double-cropped rice, Climatic yield, Meteorological factors