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The system combined closely with actual crop growth in Guanzhong arid area,and was on the basis of construction of agricultural information database and remote sensing database.It used C# application program based on WebGIS and SQL Server 2012 as remote sensing image and agricultural information management platform.We constructed networked and digital water and fertilization decision-making model and quantitative dynamic knowledge model of precision crop management and agricultural information management and decision-making system.The system realized such functions as basic map operations,query and analysis of agricultural information and remote sensing image data,generation of water and fertilization prescription,management of precision farming,visual output and system maintenance.