Effects Of Accmulation Of Dry Matter And Yield Of Winter Wheat Under Different Irrigation And Fertilization Conditions

The experiment setup four fertilization levels and four supplementary irrigation levels with winter wheat ‘Changhan 58’ as materials in canopy pool,exploring the influences of different levels of fertilization and supplementary irrigation to dry matter accumulations and crop yields and yield compositions. The results provided a basic theory and application technical support of the water and fertilizer management. The main concludions are as follows:1. The dry matter accumulation of Winter wheat was analyzed and fitted by logistic model,reached a significant level(P <0.01), and fitting in good condition. Under each treatment it is basically the same that dry matter accumulation rate tends to. The maximum rate and the biggest gap between each treatment occurs in jointing stage to flowering stage, but not significant in the other growth period. The average of highest rate of dry matter accumulation of Y3 was significantly higher than other fertilization treatments(P<0.01), But the highest rate of dry matter accumulation could be decreased by over fertilizing. The dry matter accumulation rate decreased rapidly during flowering stage to maturity stage. Insufficient or excess fertilization could make the start time of the rapid accumulation period in advance, and shortened the duration of it. No supplementary irrigation or over R1 could make the beginning time of the rapid accumulation period in advance, and increased the duration of it.2. The quadratic curve fitting in good condition of different supplementary irrigation and fertilization levels could be used to predict yield status. There was a significant effect on yield and spike numbers and kernels per spike and 1000-seed weight(P<0.05) under fertilizer conditions. There was a significant effect on yield(P<0.01) and spike numbersand kernels per spike, and no significant effect on 1000-seed weight under supplementary irrigation.3. The interaction of fertilization and supplementary irrigation could not affect yield and yield component significantly. Under the different supplementary irrigation levels, compared with the no fertilizer treatment, the Y2 treatments reached the highest yield, which increased by 13.58%~23.08(P<0.05). The R3 water treatments reached the highest crop yield, which increased by 1.00%~5.470% compared with R2 and 1.93%~10.44% compared with R1 under different fertilizer levels. The supplementary irrigation only increased the spike number to increased the yield, and the fertilizer treatments mostly increased all the yield compositions of winter wheat to increased the crop yield.