After the torturous journey, he made it back to the farmhouse where a family member phoned emergency services about midday, who scrambled the Auckland Rescue Helicopter Trust to come to his aid.
Mr Clarke said the man was in remarkably high spirits when they arrived, given that he had some potentially serious injuries.
He was flown to Whangarei Hospital about 12.10pm in a serious but stable condition.
A spokeswoman for Northland District Health Board said the man remains in hospital today in a stable condition.
Mr Clarke said he was lucky to have avoided more serious injuries.
He praised the man's "tough" actions by riding out to raise the alarm.
"He was in quite a bit of pain with us, but it had been some four hours since he had his accident, so the pain was abating a bit," Mr Clarke said.
"He's pretty hardcore farmer - a stoic old boy."