Keywords Rice;Genotypic difference;N level;Growth period;Grain yield;characteristic of dry matter production;characteristic of nitrogen uptake and utilization;Nitrogen use efficiency;Classification;

• 水稻;基因型差异;氮肥水平;生育期;籽粒产量;物质生长特性;氮素吸收利用特性;氮素利用效率;类型划分;