The harvest at a farm in Hamerton ground to a halt on Saturday after a key piece of machinery caught fire.
Firefighters from Huntingdon, Sawtry, Ramsey, Stanground, Peterborough and St Neots attended reports of a combine harvester ablaze in St Judiths Lane at about 6.45pm.
Crews arrived to find a combine harvester and 20 acres of crop on fire.
A spokesman for Cambridgeshire Fire and Rescue Service said that the cause of the fire was accidental, adding: "Wearing breathing apparatus, firefighters used five hose reels and beaters to extinguish the fire before returning to their stations by 9.20pm."
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