中文摘要：

为了探索氮肥与春小麦非叶光合器官之间的内在联系,以农麦2号为材料,在田间条件下研究了氮肥施用时期对春小麦花后非叶光合器官全氮含量及其与产量关系的调控效应。结果表明,非叶器官全氮含量自开花后随生育进程的推进呈下降趋势,不同非叶光合器官之间的全氮含量差异显著（旗叶鞘〉穗下节间〉芒〉护颖〉外稃）;不同追肥处理中非叶器官全氮递减速率与产量之间的相关性各异,其中,拔节期追肥处理中各非叶器官的全氮递减速率与产量均呈负相关。

英文摘要：

The spring wheat variety Nongmai 2 was used to study the effect of N application at different stages on the N content of non-leaf photosynthetic organs and grain yield in field conditions.The results showed that the total N content of non-leaf organs after flowering presented a decreasing trend along with the delay of growth period,and the difference of total N content in different non-leaf organs was significant.The correlation between the N decreasing rate of non-leaf organs and the grain yield was different in different N-dressing period.There was negative correlation between the N decreasing rate of non-leaf organs and the grain yield when N fertilizer was applied at jointing stage.