关键词: 播期, 晚粳稻, 籼改粳, 产量, 米质

Abstract:

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.

Key words: sowing date, late japonica rice, change indica rice to japonica rice, yield, quality