研究了播期对寒地稻区优质粳稻产量、生育期及温光资源利用的影响。结果表明，播期推迟，优质粳稻生育进程延迟，生育期缩短，主要与出苗至齐穗期日均温升高、全生育期日均光照时数减少有关；播期推迟，全生育期积温和光照时数利用率呈下降趋势，优质粳稻产量逐渐降低，减产的主要原因是在于有效穂数和穗粒数的减少。产量与气候因子的相关分析表明，出苗至齐穗期的日均温与相对产量呈极显著负相关，这是播期推迟导致产量降低的主要原因之一，而出苗至成熟期的太阳辐射与相对产量呈极显著正相关，说明在寒地稻区太阳辐射对水稻产量形成有正向作用。

This study was conducted to investigate the effects of seeding date on yield, growth stage and utilization of temperature and sunshine resource of high-quality japonica rice, clarify the main meteorological factors affecting rice yield in cold regions, so as to provide a basis for the scientific selection of high-quality japonica rice sowing dates. The results showed that the growth duration of high-quality japonica rice reduced and the growth stages shortened with the delay of sowing date, which was related to the increase of the daily average temperature from seedling stage to heading stage and the decrease of the daily average light hours in whole growth period. With the delay of sowing date, the accumulated temperature and illumination hours for growth stages and the yield of high-quality japonica rice decreased, the main reason for the reduction in yield was the decrease in the number of panicle and the number of grains per panicle. The correlation analysis between yield and climate factors showed that the daily average temperature from seedling stage to heading stage had a significant negative correlation with the relative yield, which was one of the main reasons for the decline of japonica rice yield, while the solar radiation from seedling stage to maturity stage had a significant positive correlation with the relative yield, indicating that solar radiation had a positive effect on yield formation of rice in cold regions.