A man has been airlifted to Dunedin hospital after being trapped in tractor machinery at a Southland farm.

Emergency services responded to reports that a man had become stuck in a tractor just before 11.50pm, a police media spokesperson confirmed.

A rescue helicopter was dispatched from Dunedin Hospital to the rural property on Mabel Grove Bush Rd in Mabel Bush near Invercargill.

A St John spokesman said the man in his 20s was being flown to hospital in a serious condition.

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Fire and Emergency, St John and police were called to the scene.

The accident, the cause of which is not immediately known, happened during harvesting a field of parsnips.

WorkSafe has been notified.