The Utilization Efficiency Experiment And Simulation Evaluation Of Soil Water And Fertilizer Under Different Groundwater Buried Depth

At present, the utilization efficiency of water,fertilizer and chemical fertilizer pollution is one of the important problems in the agricultural water and soil engineering research. The major crops in Hetao Irrigation District were selected studying objective in this paper. The Influence of existing irrigation schedule and fertilizing scheme of main crops on utilization efficiency of soil water, fertilizer and crops growth characters under different water lever in the lysimeters located in Shuguang Irrigation Experiment Station of Bayannaor. Then, the SWAP model was applied for simulating water balance of sunflower to evaluate efficiency of irrigation water. At last, the main results and conclusions are following:(1)Analyzing the different ground water burying depth to ground water supplies,the using,the crops biology natural character target (crop high,leaf area index) and the yield influence. the plant high,leaf targets,yield are relatively high in the burying depth of 1.5-2.0m,along with burying depth enlargement reduced gradually. Which have an direct-viewing response on the crops different period affects.(2)The soil moisture content along with the change of the irrigation under different groundwater buried depth, And is remarkable to the surface layer soil's influence; In the entire period of duration, the moisture content of 1.5,2.0m burying depth are higher than the2.5,3.0m burying depth;The ground water burying depth is small when is advantageous in crops' growth, at the same time the steams infiltrates barrel return salty certainly, so the suitable ground water burying depth is about 2.0m.(3)In the entire period of duration, Carries on the monitor to the soil nitric nitrogen content, we will obtain fertilizer is the primary cause the nitric nitrogen content increases; The ground water have the drip washing function to soil nitric nitrogen; When approaches the water level surface the nitric nitrogen content are few, and the nitric nitrogen content mainly distributes in the root system level, the content is highest in the soil burying depth 40-60cm.(4)Using the sunflower actual moisture content data of 2007 to the SWAP model carries on the moisture content migration parameter to rating and determining, and carries on the caliberation with 2008 measured data, the simulation effect are very ideal. Which obtatin the soil water balance relations under the different burying depth, and carries on the valid appraisal to irrigation,The higher irrigation efficience are 1.5m and 2.0m buryed depth, the lower are 2.5m and 3.0m buryed depth.