Effects Of Different Water And Fertilizer Treatments On The Dry Matter And Grain Yield Of The Spring Wheat

On the condition of different irrigation and nitrogen treatments, the main agronomic traits, grain filling rate, transportation and distribution of dry matter in different organs and the change rule of yield formation on xinchun26were studied. The purpose for this experiment was to get the best economic benefit, seek the reasonable combination of irrigation and nitrogen and provide certain theoretical basis for the promotion of xinchun26in Xinjiang. The results in this study were as follows:Before jointing stage, the plant height raised as irrigation frequency increasing and nitrogen was beneficial to increasing plant height; From jointing to maturity, increasing nitrogen amounts had negative effects on plant height on the condition of soil drought stress. When moisture content of soil was higher, fertilization too much was not good to plant height.The treatment of W2N3could maintain much higher number of stems and tillers. The ear length was restrained significantly when the irrigation frequency was less or on the condition of soil drought stress. Meanwhile increasing nitrogen amounts may be bad for the ear length. With increasing irrigation frequency and nitrogen, the spikelet would increase. Under different irrigation treatments, the trend of grain weigh was shown "S" curve in the process of grain filling. The maintain time of fast increase period of W2(irrigate4500m3/hm2total) was longest, while that of W1(irrigate2700m3/hm2total) was shortest. With increasing nitrogen, the lasting time of fast increase period had the trend of being shortened in the same irrigation treatment.Transfer amount and transfer efficiency of dry matter in different vegetative organs was in the order of leaves> stem> sheath. The contribution of dry matter transfer to grain was stem>leaves> sheath. Transfer amount and transfer efficiency of dry matter, the contribution to grain and yield of W2N3was the highest. The protein content and wet gluten content of spring wheat would decrease with increasing irrigation frequency, but it would increase with increasing nitrogen.In conclusion, the treatment of W2N3was the most reasonable in this study. That mean when irrigate in tillering stage, jointing stage, heading stage, filling stage and dough stage (4500m3/hm2total) and fertilize in sowing stage, tillering stage, jointing stage and heading stage (120kg/hm2every time), yield would be the highest.