Geographical information systems are in use in business application for a long time, but their usage in agriculture is well known, too. This article shows the main structure of geographical information systems for decision support (spatial decision support systems) as advanced GIS technologies made for solving complex, semistructured or nonstructured problems and their application in the agriculture sector. GIS-based technologies has been reviewed through several examples of their use in agriculture and special respect has been given to the precision farming concept, giving short insight into SSToolbox software (SST). The last part of the article is dedicate to the possible usage of GIS-based technologies in the Serbian agriculture.