近年来，“籼改粳”在江西等南方双季稻区发展较快，关于双季晚粳稻高产品种及其配套栽培技术的研究也有了较多的报道，但关于优质晚粳稻产量及品质的播期调控效应仍不清楚。本研究以南方优质晚粳稻品种甬优1538为材料，通过开展分期播种试验，研究了不同播期对优质晚粳稻产量和米质变化的影响。结果表明，随着播期的推迟，甬优1538的有效穗数呈增加趋势，每穗粒数和千粒重先增后降，而结实率呈现降低趋势，最终产量呈先增后降的趋势，以播期为6月25日时产量最高。随着播期的推迟，甬优1538的加工品质、外观品质及蒸煮与食味品质均变劣，而营养品质变化趋势因指标而异，峰值粘度、热浆粘度、冷胶粘度和崩解值呈逐渐降低趋势，而回复值和消减值呈逐渐增加趋势。可见，在南方双季稻区晚粳生产中，适当早播有利于同步实现高产和优质。

In recent years, the project of “change indica rice to japonica rice” has developed rapidly in the southern double-cropping rice area, such as Jiangxi province. There have been more reports on the high yield varieties and the supporting cultivation techniques of japonica rice. However, it is still not clear about the effects of sowing date on yield and quality of late japonica rice. In this study, the effects of different sowing date on yield and quality of late japonica rice were studied, using high quality late japonica rice Yongyou 1538 as material. The results showed that along with the delay of seeding date, the effective panicles were increased, the spikelet number per panicle and 1 000-grain weight were increased at first and then decreased, the seed setting rate showed a decreased trend, the yield first increased and then decreased, the yield was the highest when the sowing date was June 25. Along with the delay of sowing date, the processing qualities, appearance quality and eating and cooking quality became worse, but the trend of nutritional quality varied with the different indicators. The peak viscosity, hot paste viscosity, cool paste viscosity and breakdown viscosity showed a decreased trend, but the consistency viscosity and setback viscosity showed a increased trend. Timing early sowing was advantageous to achieve high yield and high quality in late japonica rice production in the southern double-cropping rice area.