Abstract-Ontologies have played a vital role in the field of agriculture. The agriculture domain is a vast and complex system science and the knowledge of it consists of many concepts and relationships. These difficult concepts and relationships have been modelled using Ontologies in various capacities in different countries. This paper is an exploratory study, presenting a review on the various ontology-based applications developed specifically in the domain of agriculture. It also discusses the various Agriculture Ontologies created by specific developing countries. Finally this paper also summarizes the directions for future work.