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在高产条件下，起身期和拔节期追氮对大穗型品种鲁麦２２号穗数的影响无显著差异；但拔节期追氮的处理较起身期追氮开花后叶面积系数、旗叶叶绿素含量、群体光合速率、干物质积累强度均显著提高，穗粒数、千粒重、经济系数明显增加。随施氮量的增加，分蘖成穗率提高，穗数增加；叶面积系数、旗叶叶绿素含量、群体光合速率均提高；干物质积累强度及向籽粒的分配比例增加。每６６６７ｍ２施纯氮１８ｋｇ的处理，以生物产量和经济系数的同步提高而获得６００ｋｇ／６６６７ｍ２的产量。
Under high-yielding conditions, there was no significant difference in the number of spikelets of large-spike cultivar Lumai 22 between the initiation and the jointing stages, but at the jointing stage, the leaf area index, flag leaf chlorophyll Content, photosynthetic rate of population, dry matter accumulation intensity were significantly increased, grain number per spike, 1000-grain weight, economic coefficient increased significantly. With the increase of N application rate, the tillering spike rate increased and spike number increased. The leaf area coefficient, flag leaf chlorophyll content and population photosynthetic rate increased, and the dry matter accumulation intensity and proportion to grain increased. Each 666 7m2 application of pure nitrogen 18kg treatment, with biological productivity and economic factors simultaneously improve access to 600kg / 666 7m2 production.