Notwithstanding any other provision of law, whenever, during the period beginning August 1, 1986, and ending July 31, 1991, the world price for a class of rice (adjusted to United States qualities and location), as determined by the Secretary of Agriculture, is below the current loan repayment rate for that class of rice, to make United States rice competitive in world markets and to maintain and expand exports of rice produced in the United States, the Commodity Credit Corporation, under such regulations as the Secretary may prescribe, shall make payments, through the issuance of negotiable marketing certificates, to persons who have entered into an agreement with the Commodity Credit Corporation to participate in the program established under this section. Such payments shall be made in such monetary amounts and subject to such terms and conditions as the Secretary determines will make rice produced in the United States available at competitive prices consistent with the purposes of this section, including such payments as may be necessary to make rice in inventory on August 1, 1986, available on the same basis.