Hafeez Noor^{1, 2}, Peiru Wang^{1, 2}, Min Sun^{1, 2,}, Aixia Ren^{1, 2}, Fida Noor¹, Zhiqiang Gao^{1, 2}

Sustainability of winter wheat yield under soluble sugar content conditions depends on improvements in crop photosynthetic characteristics and, crop yield. Experiment comprised of seven nitrogen treatments: 0 kg ha⁻¹, 90 kg ha⁻¹, 180 kg ha⁻¹, 210 kg ha^-1, 240 kg ha⁻¹, 270 kg ha⁻¹, and 300 kg ha⁻¹. The grain yield was increase by 25%, respectively. Our results indicated that implication of a proper increased nitrogen application rate, soluble sugar content, sucrose content and starch content were changed greatly, but when the threshold value was reached, the growth rate was decreased. Among them, the accumulation of soluble sugar contnt in the middle and late stages were increased, and the sucrose content and starch content were increased in each period after anthesis. The contents of each protein component were increased, the albumin was highest in 240 kg ha^-1, and the globulin was highest in 270 kg ha^-1 compaired to other nitrogen rate, respectively. The prolamin and glutenin (storage protein) were the highest in 300 kg ha^-1 and also in in 240 kg ha^-1. The protein content was improved in 300 kg ha^-1, 240 kg ha^-1, and protein yield 240 kg ha^-1 was significantly improved compared to other nitrogen application rates. The dynamic changes showed that the application of nitrogen fertilizer increased the protein contents in each period after flowering stage, but the effect was increase to 240 kg ha^-1 in began was weaken and the albumin were regulated by nitrogen fertilizer in the early stage.

albumin, photosynthetic characteristics, soluble sugar, protein, nitrogen fertilizer