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Color profiles of representative soil types from the Great Soil Groups, shown as vertical columns of soil layers from surface to depth, from the Atlas of American Agriculture

Foundation Studio I Module 3 HS20: Soil References

Six watercolor soil profiles by W.L. Kubiena, each showing a vegetation type above its layered soil horizons, with a catalog table of the sites below.
W.L. Kubiena, Atlas of Soil Profiles, Consejo Superior de Investigaciones Cientificas Institute of Soils, Madrid; 1954
Color profiles of representative soil types from the Great Soil Groups, shown as vertical columns of soil layers from surface to depth, from the Atlas of American Agriculture
Color profiles of representative soils, Atlas of American Agriculture, 1935.
Soil texture triangle chart showing the percentage of clay, silt, and sand and the resulting soil texture classes such as clay, loam, sand, and silt loam
Soil Texture Triangle. Barbour et al., Terrestrial Plant Ecology, 1987
Soil water thresholds from sand to clay, showing plant-available water between field capacity and wilting point
Plant available soil water. Lecture from Peter Lehmann, 2020
Soil profile trench showing a dark, organic-rich topsoil layer over lighter sandy subsoil, with sand lenses visible at about 40 cm depth
Soil profile. Global Soil Biodiversity Atlas. Global Soil Biodiversity initiative.
Exposed tree roots and soil on a rocky limestone embankment beside a road
Soil formation in Senan © Chair of Being Alive, 2020.
Close-up of a weathered limestone rock face with soil and roots forming in a crack, beside a road edge
Soil formation in Senan © Chair of Being Alive, 2020.