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There is a need for an application that will facilitate the storage, management and manipulation of the large amount of information available on irrigation topics. This irrigation ontology is a first approach at the use of ontologies to manage information resources. The irrigation ontology as it is defined contains more than 250 terms, and around 300 relationships divided in the topics of Water Sources, Weather, Plant, Soil, Drainage, Irrigation, Irrigation System Design, Irrigation System Management, and Irrigation Equipment and Structures.