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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).
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