Effect of nitrogen topdressing on yield and quality of in medium-gluten wheat Xiaoyan 22.

【Objective】 The objective of the paper is to provide a theoretical basis for the implementation of high yield and quality techniques for wheat cultivar of Xiaoyan 22 by topdressing nitrogen fertilizer at different stages in the center of Shaanxi Province.【Method】 With Xiaoyan 22 as test material,different amounts of nitrogen topdressing were applied at jointing and booting stages,and the effect on yield,grain quality and flour quality was investigated.【Result】 The yield was increased,13.6% more than the control by topdressing nitrogen at different stages.Nitrogen topdressing with 37.5 kg/hm2 at jointing stage and 75 kg/hm2 at booting stage resulted in strongly significant yield improvement,with a net yield increase 1 350.5 kg/hm2 over the control.Several grain and flour quality parameters including grain protein,wet gluten,dry gluten,flour yield,and water absorption were highly improved by 6.6%,9.2%,9.9%,2.3% and 2.3% respectively;sedimentation value and stability time had little change,but the hardness and degree of softening was increased by 1.8% and 22.4% respectively;development time,evaluation value farinography were reduced by 8.3%,10.5% and 16.8% respectively.【Conclusion】 Topdressing with nitrogen fertilizer could significantly improve the output and grain quality of Xiaoyan 22,while the application did not affect flour quality improvement.Nitrogen topdressing with 37.5 kg/hm2 at jointing stage and 75 kg/hm2 at booting stage produced the best effects on yield,grain protein content and flour content.