The Agricultural Ontology Service (AOS) 2012 workshop will take place this year in Kuching, Malaysia, 3-4 September, 2012. AOS 2012 is part of the Knowledge Technology Week 2012 and collocated with other relevant events, like DC 2012. This year, AOS focuses on semantic technologies for solving real-world problems related to the management of agricultural information. We encourage the submission of works discussing applications dealing with structured and semi-structured information, including textual documents, geographical and statistical data. Paper submission is open until June 30th.