关键词: 水稻, 玉针香, 播期, 产量, 品质, 抗性

Abstract: A good-quality rice variety, Yuzhenxiang, which was the major variety of Helonggong Rice, was used as material to study the effects of six different sowing dates on the growth and development, yield composition and grain quality. The results showed that the sowing date has a significant effect on the seedling quality, growth period, yield composition and grain quality. With the delay of sowing date, the air temperature in the first and middle period of growth was increased, the growth speed of plants was accelerated and the growth period was shortened, the daily average temperature during the filling period was gradually decreased, which resulting in slowing down the filling speed and prolonging the duration of grain-filling stage. In the performance of grain quality, the whole milled rice rate and appearance quality of Yuzhenxiang were improved with the delay of sowing date. Based on comprehensive analysis of the yield, quality and resistance of Yuzhenxiang affected by different sowing dates, the treatment III , which is sowing on May 18, had the highest yield and better quality and resistance.

Key words: rice, Yuzhenxiang, sowing date, yield, grain quality, resistance