There exists various web based agriculture information systems. These systems are providing required information to farmers about different crops, soil, different farming techniques etc. These web based agriculture information systems deal with numerous kinds of data but they don't maintain consistency and semantics in data. Hence ontology is used in web and provides meaningful annotations and vocabulary of terms about a certain domain. Here in this paper we are building ontology in agriculture system in web ontology language (OWL). This paper shows various classes and subclasses using OWL DL in protege5.0 for an e-agriculture information system. This paper also provides various classes and subclasses and relationship among the classes in UML class diagram for a web based agriculture information system or e-agriculture.
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