7 C.F.R. § 1410.42
(d) Limitations on annual rental payments include:
(f) CCC will prepare a schedule for each county that shows the maximum soil rental rate CCC may pay and which may be supplemented to reflect special contract requirements. Such schedule may be calculated for cropland based on the relative productivity of soils within the county using NRCS data and local FSA average cash rental estimates. For marginal pastureland, rental rates will be based on estimates of the prevailing rental values of marginal pastureland in riparian areas. Grassland rental rates will be based on not more than 75 percent of the estimated grazing value of the land. The schedule will be available in the local FSA office and will indicate, when appropriate, that: