|  | Usually three modifiers are added to the Subgroup name to make 
              the Family name. These modifiers refer to physical and chemical 
              properties important to management and use of the soil. The first 
              refers to the particle-size class of the soil, the second to the 
              dominant mineralogy, and the third to the soil temperature regime. 
              Before experiments and knowledge accumulated on soils in one area 
              can be used to guide soil management practices in other regions, 
              classification should be extended further to phases of Families, 
              to other similar site characteristics, or to the Series level of 
              classification (refer to Nominal 
              Systems in Soil Classification Systems). |