The Knoxville Rural Fire Department responded to a tractor and a corn field on fire at approximately 1:30 PM at 75th and Jewell NW of Knoxville. Apparently a tractor caught fire and ignited the corn field, which had already been harvested. Over an acre burned.  The fire took approximately an hour to extinguish.  KNIA/KRLS News will bring you more information as soon as it becomes official.