noun
farm owner; plantation owner
Refers to the owner of a farm or plantation, typically a larger-scale agricultural operation.
彼は広大な農園主で、何百人もの労働者を雇っている。
He is the owner of a vast plantation, employing hundreds of workers.
農園主は今年の収穫に満足している。
The farm owner is satisfied with this year's harvest.
地主 is a landowner in general, not necessarily involved in farming; 農園主 is specifically the owner of an agricultural operation.
Compound of 農園 (farm, plantation) and 主 (owner, master).