Research And Realization Of The Assistant Decision System Of Soil Testing And Formula Fertilization

China is a big agricultural country,and agriculture is the economic lifeline of China’s development.From the current point of view,there are some problems in China’s agriculture,such as unreasonable fertilization,abuse of chemical fertilizer,backward fertilization technology and so on.This not only causes the waste of fertilizer,the destruction of soil structure and environmental pollution,but also seriously affects the stability of agricultural production.With the development of 3S technology,computer technology and intelligent technology,the demand for soil testing and formula fertilization decision-making system is increasingly urgent.In this paper,based on the research status of soil testing and formula fertilization technology at home and abroad,combined with the functional characteristics of the current soil testing and formula fertilization system,with the smart phone as the mobile terminal,to query soil nutrients and obtain fertilization scheme as the main purpose,the auxiliary decision-making system of soil testing and formula fertilization was designed and developed.The specific research contents are as follows:(1)Research on Key TechnologiesThe key development technologies used in this system are studied in depth,including the structure,working principle and research content of mobile GIS,the use of Kriging interpolation method,and the functions and usage methods of various protocols and architecture in WebService technology.(2)Research and construction of soil testing and formula fertilization modelThis paper analyzes and studies the three main fertilization models--nutrient enrichment and deficiency method,nutrient balance method,and fertilizer effect function method,and selects the nutrient balance method as the fertilization model of the system.Based on the fertilization model,combined with the field experiment and sampling point data in the experimental area,the nutrient balance fertilization model of wheat,corn,cotton and scallion in the experimental area is constructed respectively,which is used for the fertilizer requirement of crops calculation of.(3)Establishment of soil testing formula databaseAccording to the soil nutrient data and its spatial position,the geo spatial database and attribute database were built.Spatial database is constructed by vector map based on administrative division map and soil distribution map.All kinds of attribute tables in attribute database explain the layer information in spatial database.The layers in spatial database are connected with their corresponding attribute data tables through ArcGIS to realize the connection between layers and charts.Then the corresponding connection between spatial database and attribute database is realized.(4)Design and development of the systemIn MyEclipse platform,based on Java language,GIS technology,using MySQL database,introducing the relevant data processing technology,the auxiliary decision-making system of soil testing and formula fertilization was designed and developed.The client of the system is Android mobile terminal.The Kriging interpolation method is used to interpolate the soil nutrient information of the sampling points to obtain more data.The GPS positioning technology is used to obtain the user location information,and the WebService technology is used to obtain the soil nutrient information from the server.According to the user’s demand for the yield of different crops,reasonable fertilization suggestions are formulated Precise fertilization.