4. A Soils generally without limiting chemical or physical properties Ba Deep, highly structured soils with high initial fertility Bb Soils naturally low in nutrients Bc Calcareous soils Bd Saline soils Ca Deep coarse- textured soils Cb Cracking clays Cc Hard-setting soils with dispersible clay subsoils Cd Soils with periodic subsurface waterlogging Ce Soils with periodic surface waterlogging Cf Shallow soils O Organic soils Unallocated No allocation to a 'Soil Resources' map unit LAKE Lake