目录
摘要..........................................................................................................................................2
关键词......................................................................................................................................2
Abstract....................................................................................................................................2
Key words................................................................................................................................3
引言..........................................................................................................................................3材料与方法...........................................................................................................................4
1.1试验设计............................................................................................................. *景先生毕设|www.jxszl.com +Q: @351916072@ 
...............4
1.2取样和测定方法................................................................................................................5
1.3计算方法............................................................................................................................5
1.4数据分析............................................................................................................................5
2结果与分析...........................................................................................................................5
2.1产量和氮素利用率............................................................................................................5
2.2生育时期、氮积累量和氮积累速率..................................................................................6
2.3叶片NR和GS活性..........................................................................................................7
2.4开花期小麦不同器官氮含量............................................................................................8
2.5阶段性氮素积累与产量和氮效率的关系........................................................................9
3讨论.......................................................................................................................................9
致谢........................................................................................................................................11
参考文献................................................................................................................................11

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