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为探讨不同光合器官及氮肥追施时期对小麦籽粒容重的影响，以农麦2号为材料，在开花期对不同追氮时期的小麦进行剪叶遮光处理。结果表明，剪叶遮光后小麦籽粒容重均低于正常生长植株，降低幅度为0.03%～9.15%；其中穗对籽粒容重的影响最大，穗遮光使籽粒容重下降8.13%；氮肥追施时期对籽粒容重的形成有一定影响，拔节期追施氮肥较其他时期追施氮肥能显著提高籽粒容重；不同时期追施氮肥对光合器官缺损时籽粒容重的形成有明显的调控作用，表明通过氮肥合理追施，可减少小麦花后光合器官功能受限对籽粒容重的影响。

英文摘要:

The study was made to investigate the effect on photosynthesis organs and volume weight of wheat grain of nitrogen applied at different periods, Nongmai 2 was used of test material, deprived and shielded photosynthesis organs at anthesis. The results showed that, the grain volume weight was below normal growth when the photosynthesis organs was deprived and shielded, reduced by 0.03%～9.15% .The non leaf photosynthesis organ ear had the most impact on grain volume weight among all photosynthesis organs, the grain volume weight of wheat which ear was shielded reduced by 8.13%. Nitrogenous fertilizer applying at different periods had impact on the formation of wheat grain. The wheat grain volume could be significantly improved when the nitrogenous fertilizer be applied at jointing stage than at other stages. Different nitrogen application periods had obvious regulation and control effect on the volume weight while the photosynthesis organs was impairment. The effect on the grain volume weight of wheat could be reduced while photosynthesis organs function was limited through reasonable regulation and control of nitrogenous applied periods.

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