A field fire near the City of Waldorf Wednesday afternoon is being blamed on a combine. Investigators believe that the combine created a spark that set off the blaze at just after 4pm Wednesday. The dry weather conditions also likely contributed to the cause of the fire. The Waldorf and Janesville Fire Departments were on the scene for around 2 hours before extinguishing the fire. No injuries were reported. A damage report is not available at this time.