Correlation of Rhodic Acroperox subgroup to WRB system

The correlation of the subgroup Rhodic Acroperox to the WRB/FAO system is Geric Ferralsols (Rhodic). The subdivisions of the Ferralsols reference soil group are made by use of both prefix and suffix qualifiers. The current list of these qualifiers is shown on page 58 of the reference document World Soil Resources Reports No. 103. The complete citation for the document is IUSS Working Group WRB. 2007 World Reference Base for Soil Resources 2006, first update 2007. World Soil Resources Reports No. 103. FAO, Rome.