以晋黍9号为材料,通过分析光合色素含量、净光合速率、不同器官氮素含量及其相关系数,研究了施氮时期对糜子光合特性和各器官氮素含量的影响。结果表明,分期施氮较一次性施氮特别是花期施氮能明显提高糜子光合色素含量、净光合速率和不同器官氮素含量,花后10 d增加效果最明显,分别增加了3.33%~20.85%,1.35%~18.13%,0.99%~20.85%;随着生育进程的推进,不同处理的氮素含量基本呈现逐渐减小的变化趋势,但在糜子叶片中,N3,N4和N5处理在开花期—花后10 d期间氮素含量增加,增加幅度分别为7.20%,10.20%和9.91%;花期以后不同处理光合色素含量和不同器官氮素含量大小都表现为N4>N5>N3>N2>N1>N0。研究表明,基肥、拔节肥、开花肥按2∶4∶4施氮,可以有效地提高净光合速率,增加光合色素含量和氮素含量。 Using Jinmai 9 as material, the photosynthetic pigment content, net photosynthetic rate, nitrogen contents in different organs and their correlation coefficients were analyzed to study the effects of nitrogen application on the photosynthetic characteristics and nitrogen contents of each plant. The results showed that stomatal nitrogen application significantly increased the photosynthetic pigment content, net photosynthetic rate and nitrogen content of different organs compared with the one-time nitrogen application, especially florescence application of nitrogen. The effect of staging nitrogen application on the 10th day after anthesis was the most obvious, increasing by 3.33% -20.85 %, 1.35% ~ 18.13%, 0.99% ~ 20.85%. With the advance of the fertility process, the nitrogen content of different treatments tended to decrease gradually. However, in the leaves of Broomcorn millet, N3, N4 and N5 treatments were in flowering The N content increased by 7.20%, 10.20% and 9.91%, respectively. The photosynthetic pigment content and nitrogen content of different organs after flowering showed N4> N5> N3> N2> N1> N0. The results showed that basal fertilizer, jointing fertilizer and flowering fertilizer applied nitrogen at 2:4:4, which could effectively increase net photosynthetic rate, increase photosynthetic pigment content and nitrogen content.