为给弱筋小麦优质高产氮肥的精量确定提供科学依据，以弱筋小麦宁麦9号为材料，研究了氮肥不同基追比对其群体结构和产量的影响。结果表明：小麦籽粒产量、茎蘖成穗率、最大叶面积指数、成熟期生物产量和花后干物质积累量与拔节期追氮比例均呈极显著二次曲线关系；成穗数、茎蘖成穗率、最大叶面积指数、成熟期生物产量和花后干物质积累量与产量呈显著或极显著正相关关系。弱筋小麦实现6100kg/hm2以上产量水平的氮肥运筹技术，即在总施氮量为225kg/hm2条件下，采用追肥在拔节期一次施用，以氮肥基追比6：4和5：5为弱筋小麦宁麦9号最佳氮肥运筹方案，该群体各项质量指标均较为合理，形成了高效群体，成穗数为477~486万/hm2，茎蘖成穗率为48.6%~48.9%，最适宜叶面积指数为6.92~7.08，成熟期生物产量和花后干物质积累量分别为14460~15330kg/hm2和4455~4515kg/hm2。

The study is to provide scientific base for fine quality and high yield of weak-gluten wheat with proper application of nitrogen fertilizer. It employed weak-gluten Ningmai 9 to study the effects of nitrogen dressing ratios on its population structure and grain yield. The results indicated that the grain yield, the spike rate, the max leaf area index (LAI), biomass at maturity and post-anthesis dry matter accumulation showed conic relation with nitrogen rates on the jointing stage. The spike number, the spike rate, the max LAI, biomass at maturity and post-anthesis dry matter accumulation were significantly correlated with the grain yield. The optimal nitrogen application scheme in weak-gluten wheat Ningmai 9 with the grain yield of over 6100kg/hm2 was on the condition of the 225kg/hm2 nitrogen application, the 6:4 and 5:5 dressing ratios and topdressing during the jointing stage. This population was an efficient one and its quality indexes were more equitable. The corresponding indexes were 477~486×104/hm2 of spike number, 48.6~48.9% of spike rate, 6.92~7.08 of the max LAI, 14460~15330kg/hm2 biomass at maturity and 4455~4515kg/hm2 of post-anthesis dry matter accumulation.