North Yorkshire Fire and Rescue Service were called to farmland at Fordon Lane, Staxton, in Ryedale, North Yorkshire, shortly before 8pm on Saturday,
Crews from Scarborough, Filey and Malton attended the scene, where a spokesman said "a male had become trapped in farm machinery by his leg".
Firefighters used hydraulic cutting equipment and small tools to release the man from machinery, and he was flown to Hull Royal Infirmary by the Yorkshire Air Ambulance.
Further details about the man’s injuries could not be confirmed.
The incident comes as Warwickshire-based farmer James Chapman published a Nuffield Farming Scholarships Trust report ’How farming safety can be improved’.
Mr Chapman, who works on a 182ha (450-acre) arable farm, lost his left arm in 2005 after becoming entangled in an unguarded PTO shaft while working on a friend’s farm.
Since then he has worked to educate others in the industry about farm safety through Young Farmers and the Health and Safety Executive and was awarded an MBE for services to farming in 2012.