Effects of Different Nitrogen Rates and Dressing Ratios on Grain Yield and Quality in Weak-gluten Wheat

Simultaneously improving grain yield and quality trait are two key targets in weak-gluten wheat production.Field experiments were conducted using two weak-gluten wheat cultivars,Yangmai9 and Ningmai9,to investigate the effects of nitrogen rates and dressing ratios on grain yield and quality formation,and to explore a more reasonable nitrogen fertilization strategy. The results showed that grain yield increased with increasing nitrogen rates,but excess nitrogen was unfavorable for yield increasing.Grain protein content,test weight,wet gluten content,sedimentation value,water absorption and stability time enhanced,but grain starch content and dough degree of softening reduced with the increasing of nitrogen rates and dressing ratios.Development time increased with increased nitrogen rates while reduced with increased dressing ratios.Grain protein components were also enhanced with the order of globulinglutenin gliadinalbumin with the increasing of nitrogen rates,while only gliadin and glutenin content were increased under dressing ratio treatments.Amylose content increased with nitrogen rates and dressing ratios,but the ratio of amylopectin to amylose reduced.Under 180 kg·ha~(-1),grain yield,the contents of crude protein,gliadin and glutenin were enhanced under treatment of N7-2-1 compared with N7-3,but the contents of wet gluten content was ideally reduced to below the national criterion.The results indicate that grain yield and quality could be improved synchronously under nitrogen rate of 180 kg·ha~(-1) with a basis to dressing ratio of 7∶2∶1 in weak-gluten wheat production.