The total amount of payments which a person shall be entitled to receive under one or more of the annual programs established by titles IV, V, and VI of this Act for the 1974 through 1976 crops of the commodities and by titles IV and V of the Food and Agriculture Act of 1977 and titles IV, V, and VI of this Act for the 1977 crop of the commodities shall not exceed $20,000.

The term “payments” as used in this section shall not include loans or purchases, or any part of any payment which is determined by the Secretary to represent compensation for resource adjustment or public access for recreation.

If the Secretary determines that the total amount of payments which will be earned by any person under the program in effect for any crop will be reduced under this section, the set-aside acreage for the farm or farms on which such person will be sharing in payments earned under such program shall be reduced to such extent and in such manner as the Secretary determines will be fair and reasonable in relation to the amount of the payment reduction.

The Secretary shall issue regulations defining the term “person” and prescribing such rules as he determines necessary to assure a fair and reasonable application of such limitation: Provided, That the provisions of this Act which limit payments to any person shall not be applicable to lands owned by States, political subdivisions, or agencies thereof, so long as such lands are farmed primarily in the direct furtherance of a public function, as determined by the Secretary. The rules for determining whether corporations and their stockholders may be considered as separate persons shall be in accordance with the regulations issued by the Secretary on December 18, 1970.