; (ii) to offer to reenroll the land under the contract if the land remains eligible under the terms in effect as of the date of expiration; or (iii) not to reenroll the land under the contract and to enroll that land through a Grassland 30 contract under this subsection. (4) Term The term of a Grassland 30 contract shall be 30 years. (5) Agreements To be eligible to enroll land in the conservation reserve program through a Grassland 30 contract, the owner of the land shall enter into an agreement with the Secretary— (A) to implement a conservation reserve plan developed for the land; (B) to comply with the terms and conditions of the contract and any related agreements; and (C) to temporarily suspend the base history for the land covered by the contract. (6) Terms and conditions of Grassland 30 contracts (A) In general A Grassland 30 contract shall include terms and conditions that promote sustainable grazing systems, protect and enhance soil carbon levels, and are compatible with wildlife habitat conservation, as determined by the Secretary, and may include any additional provision that the Secretary determines is appropriate to carry out this subsection or facilitate the practical administration of this subsection. (B) Violation On the violation of a term or condition of a Grassland 30 contract, the Secretary may require the owner to refund all or part of any payments received by the owner under the conservation reserve program, with interest on the payments, as determined appropriate by the Secretary. (C) Compatible uses Land subject to a Grassland 30 contract may be used for compatible economic uses, including hunting and fishing, if the use— (i) is specifically permitted by the conservation reserve plan developed for the land