21 third-grade classes with 476 students in Marion County are attending the ninth annual Ag Day at the Maze at Dan-D Farms in Knoxville today. Jana Dennison with Dan-D Farms says every school in Marion County, including homeschoolers, will be attending. She says Ag Day, is a well coordinated event hosted by volunteers from several farm-related organizations, and third graders will rotate through seven hay classrooms and learn about the Iowa products they represent. Dennison adds they will then have time to find their way through the 18 acre dinosaur maze, among other activities. For more information on the farm visit dandfarms.com or call 641-842-2829.