Driverless tractors, drones and 3-D printed food may be pretty common on the average Iowa farm by the year 2030, a futurist told attendees at the third annual Iowa Farm Bureau Economic Summit last week in Ames.

Thomas Frey, executive director and senior futurist at the DaVinci Institute, predicts that by the year 2030, the average farmer will own more than one drone, use driverless tractors, trucks and combines, own printed buildings, have packages delivered by drones, grow marijuana as a cash crop, use vertical greenhouses for specialty...