sol-, -sol +
(Latin: base, ground, soil, bottom; the lowest part of something; sole of the foot or a shoe)
Soil orders are named by adding the suffix -sol to a root word, as shown in the table of the United States Soil Taxonomy and the soil classification system of the Food and Agriculture Organization, FAO (agency of the United Nations).
Many of the applicable soilwords which are listed and defined in this unit do not use the -sol suffix; however, they are included because they are essential parts of the major listings of the U.S. Soil Taxonomy and the Food and Agriculture Organization presentations.
The soil groups are based on extensive sets of field and laboratory observations and on extensive technical criteria.