关键词: 水稻, 协优9308, 秀水110, 生育期温光条件, 籽粒充实, 米质

Abstract: The sowing time experiments with the sowing times in April 15 (D1),April 30 (D2),May 15 (D3),May 30 (D4),June 14 (D5) and June 15 (D6) were conducted to study the influence of the temperature and light conditions on the rice grain filling and quality. the rice varieties were Xieyou 9308 and Xiushui 110. The results showed that the effective accumulated temperature,sunshine hours and the growth duration decreased as the sowing date delaying in the duration from sowing to heading and the whole growth stage,while no significant regularity was found in the duration from heading to maturity. The daily average temperature changes showed the different trends in the different growth stages. The temperature and illumination conditions in the duration from sowing to heading had more significant impacts on the grain filling rate,yield and quality for variety Xieyou 9308 than that in the duration from heading to maturity,but those differences responding to different growing periods were not obvious for variety Xiushui 110. Furthermore,as the sowing time delayed,the yield and chalkiness degree of Xieyou 9308 decreased,but the head rice rate and protein increased. It was difficult for the variety Xieyou 9308 to get the high yield and quality at same time. For variety Xiushui 110,the yield was higher in the D5 treatment with the highest protein content and head rice rate,and the lowest chalkiness degree. For variety Xiushui 110 to select appropriate sowing time could receive high yield and quality.

Key words: Rice, Rice, Xieyou 9308, Xiushui 110, Temperature and illumination conditions in different growth stages, Grain filling, Grain quality