Mu Junyi^{1, 2}, Hu Yanan^{1, 2}, Hafeez Noor^{1, 2}, Jiayu Sun^{1, 2}, Fida Noor¹, Pengcheng Ding^{1, 2}, Aixia Ren^{1, 2}, Linghong Li^{1, 2}, Min Sun^{1, 2,}, Zhiqiang Gao^{1, 2}

Reducing the leaf senescence rate could improve the grain yield in wheat. In the present study, responses of photosynthesis, stomata conductance, SPAD, and yield traits of winter wheat. The results indicated from different nitrogen rate, and variety YH- 20410 significantly affected the yield, and grain quality. The P_N, C_i and E of flag leaves during grain filling, and decreased g_s of flag leaves. Nitrogen application significantly increased the P_N, C_i and E significantly decreased the g_s of post-anthesis flag leaves with 210 kg ha⁻¹ was the best, and SPAD was the best N280. Nitrogen application amount 210 kg ha^–1 combined to variety YH-20410 increased the soluble sugar content in grains at the filling stage. The difference between nitrogen application was significant on 1000-grain mass, Spike number, Grain number per spike, leaf area index nitrogen application rate of 210 kg ha^–1, and variety YH-20410 reached the highest at anthesis and maturity stage, promote the transpiration of flag leaves, intercellular CO₂, yield were the highest under N210 compared to others nitrogen rate. The yield, and three factors were the highest in N210 kg ha⁻¹, and enhances Photosynthetic Characteristics of flag leaves, the spike number, and yield had significant difference compared with other N application rates.

nitrogen fertilizer, photosynthetic characteristics, globulin, sugar content, sucrose content