The aim of the Special Session on Agricultural Metadata and Semantics of MTSR'07 is to bring together researchers and practitioners that are working on agricultural knowledge production, organization, and exchange from a Semantic Web perspective. It aims to serve as a discussion forum where interested experts will present the results of their work, and establish liaisons with other groups that are working on related subjects. In addition, it aims to outline the rich potential of the agricultural knowledge domain as an application field for advanced metadata- and semantic-driven systems and services. The Special Session will include: 6 full paper presentations and 3 poster presentations, 1 keynote presentation about the Agricultural Information Management Standards (AIMS) initiative.