 There are currently 84 wineries ("bodegas") listed in the DO.The white soil of Montilla-Moriles is rich in calcium carbonate; the soil and subsoil are formed by soft loams, poor in natural organic material, and are not very fertile.The soil has a very simple mineral structure, basically limestone and silica, and has a lumpy pastry-like structure, with a low content of chlorides and sulphates.