farmer; farm owner; agriculturalist
Refers specifically to the owner or operator of a farm, not just any farm worker.
He is a farm owner with vast land.
The farmer gets up early every morning to take care of the cows.
農民 refers to peasants or agricultural workers as a social class, often with a historical or rural connotation, unlike the neutral 農場主.
Compound of 農場 (farm) + 主 (master/owner).