Coupling Effects Of Water And Fertilizer On Yield And Quality Of Winter Wheat

The medium gluten wheat Yang 12 was tested in the pot experiment and simulation experiment. The split plot was designed in the pot experiment. The main treatment was nitrogen supplying which had three levels; the subsidiary treatment was soil moisture which had four levels during booting and flowering stage. There were two soil moisture levels in the simulation experiment. The study contents were: coupling effects of water and fertilizer on the forming characteristics of yield and quality in winter wheat, index of plant type and quality with high quality and yield, physiological characteristics in later stage and nutrient metabolizing trait in plant, the connection of grain yield, quality and each index. The water and fertilizer coupling threshold of harmonizing yield and quality was put forward in this article. The results showed that:1. The yield of winter wheat increased and then reduced following the increase of the water and fertilizer. The yield was the highest when the soil moisture was 19.0% and nitrogen supplying content was 2.56 g/pot. As the soil moisture and nitrogen supplying increased, effect of yield increasing fell down ceaselessly.2. Grain protein content had negative correlation with soil moisture ,but positive with nitrogen supplying content .Both of them reached conspicuous level. When the nitrogen supplying content was 2.88 g/pot, the grain protein content had reached fine quality standard of medium-gluten wheat when the soil moisture were 11.5%, 15% and 18,75%. As the improvement of nitrogen supplying level, the proportion of globumin and albumin in the total albumen descended, but the proportion of gliadin and glutenin lifted notably. In the same nitrogen supplying level, soil water stress was propitious to the advance of grain glutenin content and ratio of glutenin to gliadin. The change trend of grain starch and component content with water and fertilizer was reverse to that with protein content. The over-low soil moisture would reduce amylose content, but increase amylopectin content. Both over-low and over-high soil moisture would reduce total starch content of grain and the ratio of amylase content to amylopectin content in different extent. Soil water stress was propitious to the increase of dry and wet gluten content of grain. The dry and wet gluten content and sedimentation value had positive...