Key farm variables: area, livestock (LSU), labour force and standard output (SO) by agricultural size of farm (UAA) and age of manager

Key farm variables: area, livestock (LSU), labour force and standard output (SO) by agricultural size of farm (UAA) and age of manager核心农场变量涵盖农田面积、牲畜（Livestock Unit，LSU）、劳动力与标准产出（Standard Output，SO），其统计分组依据为农场农业规模（Utilized Agricultural Area，UAA）与管理者年龄。