Federated Farmers Hawke's Bay president Jim Galloway said it was a terrible incident and sympathised with the family.
While he doesn't know the circumstances surrounding the accident, Galloway said lots of factors could be at play.
"I do not know the circumstances, but this year with the long grass, it can hide hazards in the ground and you've just got to concentrate a lot more on where you're driving or what you're doing," he said.
"It is so easy to miss something in the ground that can cause an accident."
Despite the unfortunate event, he hoped the tragedy would serve as an important message for people.
"It is the worst kind of thing to have to learn from, but if we can learn from it and reduce accidents in the future, that would be at least something reasonable to come out of it."
WorkSafe and Victim Support have been advised.
A WorkSafe spokeswoman said they are investigating the incident.