; (E) contains a schedule for the planning, installation, maintenance, improvement, and management of the selected conservation systems, practices, activities, and management measures; and (F) contains a description and schedule for on-farm activities to assess and evaluate the conservation systems, practices, activities, and management measures described in the plan. (3) Conservation activity (A) In general The term conservation activity means a conservation practice, enhancement, bundle, or plan. (B) Inclusions The term conservation activity includes— (i) structural measures, vegetative measures, and land management measures, as determined by the Secretary; (ii) planning needed to address a priority resource concern; and (iii) development of a comprehensive conservation plan. (4) Eligible land (A) In general The term eligible land means— (i) private or Tribal land on which agricultural commodities, livestock, or forest-related products are produced; and (ii) land associated with the land described in clause (i) on which priority resource concerns could be addressed through a contract under the applicable program. (B) Inclusions The term eligible land includes— (i) cropland; (ii) grassland; (iii) rangeland; (iv) pasture land; (v) nonindustrial private forest land; and (vi) other land in agricultural areas (including cropped woodland, marshes, and agricultural land used or capable of being used for the production of livestock), on which priority resource concerns relating to agricultural production could be addressed through a contract under the program, as determined by the Secretary. (5) Priority resource concern The term priority resource concern means a natural resource concern or problem, as determined by the Secretary, that— (A) is identified at the national, State, or local level as a priority for a particular area of a State; (B) represents a significant concern in a State or region