Two fire engines from the Melton station were deployed to the incident, on Waltham Lane, together with a water carrier from Loughborough.
A spokesperson for Leicestershire Fire and Rescue Service said: “We had a call at 7.45am from a member of the public about a stack fire in a field.
“The incident commander confirmed it involved a stack of approximately 100 straw bales and the farmer was removing unburnt bales to make a fire break.
“Livestock in the field has not been affected by the fire.
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“Fire crews are using a water hose reel to damp down flying embers.”