以河龙贡米的主栽品种玉针香为材料，设置6个不同的播种期处理，研究不同播期对玉针香生长发育、产量构成和稻米品质的影响。结果表明，播种期对玉针香秧苗素质、生育期、产量构成和稻米品质均有影响。随着播种期的推迟，玉针香生长的前、中期气温升高，植株发育速度加快，生育期缩短，灌浆期日平均温度逐渐下降，灌浆速度变慢，灌浆持续的时间变长。在稻米品质性状表现上，随着播期的推迟，玉针香的整精米率和外观品质得到提高。综合产量、品质和抗性表现，以5月18日播种的处理产量最高，品质和抗性表现也较好。

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.