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This unit introduces students to the components of soil and soil physical properties, and how each affect soil use and management. The. International soil classification system for naming soils and creating legends for soil maps. file: ftp://ftp.fao.org/agl/agll/docs/wsrr103e.pdf. See pubs.ext.vt.edu/430/430-350/430-350_pdf.pdf for more information on basic soils! Page 2. Well weathered. (red, clayey) soil from the. Piedmont Soils are complex mixtures of minerals, water, air, organic matter, and countless organisms that are the decaying remains of once-living things. Some new international developments in soil information systems and soil classification, such as the Field Book for Describing and Sampling. Soils(Schoenebergeredu/files/pubs/az1413.pdf. Describes the use of gypsum and other calcium amendments in southwestern soils to stabilize soil aggregates. Resources