Firefighters found themselves surrounded by flames as they battled to bring a field fire under control.
They were alerted to a blaze in a field of standing corn, off Stacey Crescent, Grimethorpe, Barnsley, at 6.30pm on Monday.
They used scythes to cut the corn and beaters to extinguish the flames.
Crews spent around 30 minutes fighting the flames.
On Sunday night firefighters dealt with a blaze in a field of standing corn off Mere Lane, Armthorpe, Doncaster.
It is not know what caused either fire.
On Monday night a fire in the open off Engine Lane, Shafton, Barnsley, was started deliberately.
Crews were called out to extinguish the flames.
Fire chiefs are warning that the risk of countryside fires increases during warm spells.
A South Yorkshire Fire and Rescue spokesman said: “During hot and dry weather the risk of fire in the countryside increases, but following a few simple steps can greatly reduce the chance of a fire starting.
“Fire officers are asking people to help prevent these fires by not using open fires in the countryside and making sure any barbecue or disposable barbecue is only used in a suitable location and is extinguished properly after use.
“Cigarettes should be extinguished completely and cigarette ends should not be thrown on the ground.
“Never leave bottles or glass in woodland – sunlight shining through glass can start fires.
“Fire crews want their resources available to protect the communities of South Yorkshire.
“Incidents involving fires in the countryside can take up a lot of these vital resources.”