Abstract: Daily meteorological data including average temperature,maximum temperature,minimum temperature,and sunshine hours in Liuzhou from October 2020 to November 2022,along with development period,grain-filling rate,and yield structure data of late rice (Yexiang Youlisi) from staggered sowing experiments conducted from 2020 to 2022,were analyzed to determine the effects of meteorological conditions on grain-filling rate and yield structure of late rice.Results showed that the grain-filling rate during 11-20 days after flowering was extremely significantly positively correlated (P<0.01) with average temperature,maximum temperature,and minimum temperature,and significantly positively correlated (P<0.05) with sunshine hours.The grain-filling rate during 21-30 days after flowering was only significantly positively correlated (P<0.05) with maximum temperature,while other meteorological factors did not reach significant correlation.By establishing regression equations between grain-filling rate and average temperature,maximum temperature,minimum temperature,and sunshine hours,the calculated agrometeorological service indicators for the grain-filling period of late rice in Guangxi indicated that the lower threshold values for 5-day average temperature,maximum temperature,and sunshine hours during the grain-filling period were 19.5 ℃,26.7 ℃,and 21.2 h,respectively; and the optimum values were 25.0 ℃,35.9 ℃,and 41.0 h,respectively.

Key words: Average temperature, Maximum temperature, Sowing date, Meteorological indicators