Study on Soil Nutrient Management Andfertilization Model in Ningxia County Territorywith Gis

By adopting the GIS technology, this thesis tries to collect and recognize the existing pedological map, the soil nutrient graphic document and other related documents data of Ningxia. And with the classification and filtration to the material, the spatial databases and the attribute database can be established to combine the county territory soil nutrient data and the geography graph together to make the uninteresting form data visualized. Based on the soil nutrient database, the mathematical model is established by means of the design of the regression orthogonal combination. And Through the mathematical model optimization, the quantity of nitrophoskas which is employed at the maximum production rate as well as at the lowest can be obtained. With these, the paper proposes a model which can dispose, judge and analyze all the factors related to the fertilization to achieve the concrete formula and the amount of commonly used fat and the special-purpose compound fat. Therefore, the data analysis and the auxiliary decision-making enormously facilitate, and the automatization and the rationalization of all kind of crop's fertilization scheme in Ningxia can be realized.