本文采用裂区设计，研究了不同氮肥施用量和不同施用比例（基蘖肥与穗粒肥比例）对穗重型品种绥粳4号和穗数型品种垦鉴稻6号产量和稻米品质的影响。试验结果表明，穗重型品种在纯氮用量为150 kg/hm2、基蘖肥与穗粒肥比例为7∶3时产量最高，达8 750.2 kg/hm2；穗数型品种在纯氮用量为128 kg/hm2、基蘖肥与穗粒肥比例为7∶3时产量最高，达9 083.3 kg/hm2；合理施用氮肥可以改善稻米品质，特别是蒸煮食味品质，本试验条件下纯氮用量为128 kg/hm2时大米的品质最佳。

This paper studied the effects of different nitrogen rates and nitrogen ratios on yield and grain quality of Suijing 4 （panicle weight type cultivar） and Kenjiandao 6 （panicle quantity type cultivar） by using split plot design. The results showed that the highest yield of panicle weight type cultivar is at nitrogen rate 150 kg/hm2 and nitrogen ratio 7∶3, the highest yield of panicle quantity type cultivar is at nitrogen rate 120 kg/hm2 and nitrogen ratio 7∶3. Reasonable application of nitrogen fertilizer could improve grain quality, especially cooking and eating quality.  Under this experiment condition, the nitrogen application of 128 kg/hm2 would gain the best grain quality.