; (iv) the eligible land may be eligible for a walk-in access program of the applicable State, if any; and (v) a nonprofit wildlife organization may provide to the owner or operator of the eligible land a payment in exchange for an agreement by the owner or operator not to harvest the conserving use cover. (2) Payments Except as provided in paragraphs (5) and (6)(B)(ii), the annual rental rate for a payment under an agreement described in subsection (b) shall be equal to 50 percent of the average rental rate for the applicable county under section 1234(d), as determined by the Secretary. (3) Limitation on enrolled land Not more than 15 percent of the eligible land on a farm may be enrolled in the program under this section. (4) Term (A) In general Except as provided in subparagraph (B), each agreement described in subsection (b) shall be for a term of 3, 4, or 5 years, as determined by the parties to the agreement. (B) Early termination (i) Secretary The Secretary may terminate an agreement described in subsection (b) before the end of the term described in subparagraph (A) if the Secretary determines that the early termination of the agreement is necessary. (ii) Owners and operators An owner and (if applicable) an operator of eligible land enrolled in the program under this section may terminate an agreement described in subsection (b) before the end of the term described in subparagraph (A) if the owner and (if applicable) the operator pay— (I) to the Secretary an amount equal to the amount of rental payments received under the agreement