farm
(1) For the purpose of this subchapter, the term “farm” shall mean a parcel or parcels of land operated as a single unit which is used for the production of one or more agricultural commodities and which customarily produces or is capable of producing such commodities for sale and for home use of a gross annual value of not less than the equivalent of a gross annual value of $400 in 1944, as determined by the Secretary. The Secretary shall promptly determine whether any parcel or parcels of land constitute a farm for the purposes of this subchapter whenever requested to do so by any interested Federal, State, or local public agency, and his determination shall be conclusive.