Effects Of The Manipulation Of Irrigation And Nitrogen Fertilizer On Grain Yield, Quality And The Metabolization Of Carbon And Nitrogen In Wheat

Two wheat cultivars, GC8901, JN17 with high gluten content and SN1391 with low gluten content were used for investigating integrative effects of irrigation and nitrogen combination on grain yield and quality through systematic experiments in 2003～2006 under both field and pot conditions. The study focused on the physiological basis, related enzyme activities and dynamic changes of plant Hormones in Developing strong grains and weak grains for the formation of grain yield and quality. The principal results are as follows:1 Effects of the manipulation of irrigation and nitrogen fertilizer on grain yield and qualityThe manipulation of irrigation and nitrogen had a great effect on grain yield and wheat quality. Under post anthesis water stress condition, grain yield increased significantly with increasing amount of nitrogen application. 200kg/hm2 nitrogen amount led to increased grain yield, indicating that wheat yield could be effctively increased by approariate combination of irrigation and nitrogen manipulations.Increasing nitrogen application amount could increase the grain protein content, GMP content of two wheat cultivars of SN1391 and JN17. Grain protein content in SN1391 was increased by post anthesis water stress under 200kg/hm2 nitrogen application amount, but a reversed tendency was observed in JN17. Increasing nitrogen amount led to reduced albumin content and increased globumin, gliadin, glutenin contents.Increasing amount of nitrogen improved the dry and wet glutenin contents in GC8901 and SN1391. Dry and wet gluten content were increased in SN1391 and decreased in JN17 by post anthesis water stress, respectively. And dry and wet glutenin contents in SN1391 was significantly lower than that in JN17.Sedimentation volume was highest with 200kg/hm2 nitrogen appilcation amount in both...