From horse-drawn plows to drones, Kansas farms have evolved. Barton County fourth graders got a crash course in all things agricultural Wednesday during Kids Ag Day.This annual event, organized by the ag committee of the Great Bend Chamber of Commerce, is always held at a real farm, where children are shown animals, machinery and crops. This year they spent their school day at the Ron Koelsch Farm west of Great Bend.Children sat on straw bales as they listened to real farmers and ranchers talk.