Abstract:

The main task of this study was to choose the best sowing date for late-season rice grown in 5 typical rice ecological zones in Guangdong Provinces and research impacts of climate change on yield of late-season rice cultivars released in recent years and widely used in commercial production. The interval sowing experiments were conducted by using super hybrid rice combinations Tianyou998, super rice cultivar Yuxiangyouzhan and one hybrid rice cultivar Tianyou428, grown in 5 locations e.s. Shaoguang, Zhaoqing, Guangzhou, Shantou, Zhanjiang, in 2009 late season. There were differences in effects of sowing date on yield and its components depending on the geography, especially the optimum sowing date of different location were July 2nd (B), July 16th (D), July 16th (D), July 23rd (E), July 9th (C), respectively. This study also analyzed the relationships between yield’s components and the environmental factors including temperature, precipitation, illumination and established stepwise regression equations, the results showed that periodic changes in weather environment, such as lower mean daily maximum temperature, lower mean daily minimum temperature, higher average day temperature and accumulated temperature, from reviving stage to the jointing stage, and higher average temperature and less average day sunshine hours from booting stage to heading stage, and more accumulated sunshine hours, were conductive to increasing late-season rice production.