Subject to subsection (e), the Secretary may make appropriate adjustments in the loan rates for any loan commodity (other than cotton) for differences in grade, type, quality, location, and other factors.

The adjustments under subsection (a) shall, to the maximum extent practicable, be made in such a manner that the average loan level for the commodity will, on the basis of the anticipated incidence of the factors, be equal to the level of support determined in accordance with this subchapter and subtitle C.