Analysis Of The Effects Of Fertilization Level On Wheat Yield In Rainfed Land Of The Gully Regions Of Loess Plateau

The Loess Gully Area is one of the major wheat producing areas of China, has a goodlight and heat resources, wheat production potential. In this paper, the effects of differentfertilization proportions N and P on wheat yield in rainfed land of gully regions of LoessPlateau was studied based on the long-term location experiment in Changwu, Shaanxiprovince and the trend surface analysis in the conditions of normal rainfall. A fitting model ofthe wheat fertilizing amount and its yield in this area was thus observed, fertilizationproportions with higher and the highest yield discovered. Then the wheat yield with N and Pcould be predicted by using the trend surface model and provide theoretical basis for theactual agricultural production. The paper has achieved the following conclusions:Trend surface analysis method can be used to analyze the trend of wheat productionmodel,and the goodness of fit is relatively high. R~2=0.95355417. Using the model obtainedthe highest ratio of fertilizer for wheat production:（x0，y0）=（178.1685，198.4053）, thatis, when the amount of nitrogen fertilizer178.1685kg/hm~2the phosphorus198.4053kg/hm~2wheat production to obtain the maximum6152.6kg/hm~2. Simulation results and the actualoutput of the model is basically consistent, Reliable prediction can be made within the scopeof treatment under the conditions of normal years production with the trend surface model.Zhang Rui, Wang Bing, HAO Ming and other studies have shown that wheat production notonly effect by the amount of nitrogen and phosphorus fertilization, but also effect by theapplication rate of potash fertilizer and organic fertilizer, and soil moisture and other factorsalso have great relevance.The model predictions will be more reliable if these factors weretaken into account.The ratio of N, P is the effective measures to improve the wheat production, and the singleapplication of N fertilizer yield more obvious than single application of P fertilizer. This isconsistent with the other long-term test results of HAO Mingde, Liu Yi. According to thetrend surface model obtained the maximum of the wheat yield is6152.6kg/hm~2, Thecorresponding amount of N, P fertilization has not been implemented,it shows that the wheatyield potential may still be seen in the region if the amount of fertilizer was increased, andfurther research is needed.However, the application of fertilizers is not the more the better. It will seriously affectthe fertility of the soil if we just use the land but does not raise it.Excessive implementation ofthe fertilizer will not only result in a waste of resources, but also bring some negative impact of soil, water, environment and atmospheric environment. Because of the soil nutrientconditions often have a big difference between different regions,in agricultural production weshould be read in conjunction with the corresponding soil agrochemical analysis of the results,and further to find the optimum ratio of the amount of fertilizer used. All in all, in the pursuitof high-yield wheat in the agricultural production, At the same time,we should also becombined with the actual situation of agricultural production and to minimize the the negativeimpact of fertilization on agricultural ecological environment.