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| Cecil series soils | |
|---|---|
| Name | Cecil series soils |
| Region | Southeastern United States |
| Classification | Ultisols |
| Parent material | residual weathering of igneous and metamorphic rocks |
| Drainage | well-drained |
Cecil series soils are a widespread group of well-drained, red, clay-rich Ultisols named for a county in the southeastern United States and recognized for their role in agriculture, forestry, and landscape evolution. They occur extensively across plateaus and piedmonts, influence land use in states like Georgia (U.S. state), South Carolina, North Carolina, and Virginia, and have been a focus of soil surveys by the United States Department of Agriculture and studies at universities such as the University of Georgia, Clemson University, and North Carolina State University.
Cecil series soils are dominantly mapped on the Piedmont, Blue Ridge Mountains, and parts of the Atlantic Coastal Plain, extending through counties historically shaped by colonial settlement and industrial development such as Richmond County, Georgia, Greenville County, South Carolina, and Fayetteville, North Carolina. They are included in regional inventories maintained by the Natural Resources Conservation Service and have been described in reports connected to projects like the Civilian Conservation Corps-era land management and later Soil Conservation Service programs. Distribution patterns of Cecil series soils have influenced transportation corridors such as Interstate 85 (Virginia–Alabama), urban growth around cities like Charlotte, North Carolina and Atlanta, Georgia, and resource extraction histories linked to the Piedmont Plateau.
Cecil series soils formed from long-term weathering of igneous rocks (e.g., granite) and metamorphic rocks (e.g., schist, gneiss) under humid temperate climates influenced by Pleistocene and Holocene climatic shifts and vegetative cover such as oak–hickory forests tied to ecological regions like the Eastern Temperate Forests. Pedogenesis involved processes documented in studies from institutions like the Smithsonian Institution and the Oak Ridge National Laboratory, including clay translocation, iron oxide accumulation, and leaching driven by rainfall regimes associated with features like Fall Line (Eastern United States) and storms from the Gulf of Mexico and Atlantic Ocean. Human activities since European colonization, including practices during the Cotton Belt era and land use changes after the Industrial Revolution in the United States, have modified pedogenic trajectories through agriculture, erosion, and reforestation.
The canonical Cecil profile exhibits an A horizon of dark, organic-enriched surface soil over an E or transitional horizon, a prominent argillic B horizon enriched in clay and iron oxides yielding red coloration, and a C horizon of saprolite grading into parent rock typical of Ultisols as classified by the United States Department of Agriculture Soil Taxonomy. The series falls within orders and suborders that are often compared to profiles described in classic texts from scholars at Iowa State University and University of Illinois Urbana–Champaign, and is used as a reference in mapping units for county soil surveys coordinated with agencies like the Soil Science Society of America.
Cecil series soils are characterized by medium to fine texture, high clay content in subsoil dominated by kaolinite and mixed-layer clays studied in mineralogical surveys at Massachusetts Institute of Technology and University of Wisconsin–Madison, low base saturation, moderate organic carbon in surface horizons, and high concentrations of iron oxides such as hematite and goethite that give the soils their red color. Chemical properties include acidic pH common in eastern U.S. soils, cation exchange capacity influenced by clay mineralogy noted in research from Rutgers University, and susceptibility to phosphorus fixation, a concern addressed in extension work by University of Florida and North Carolina A&T State University.
Historically, Cecil series soils supported cash crops across the Cotton Belt and later diversified into mixed farming systems with crops like corn, soybeans, and small grains, as promoted by extension services at institutions such as Auburn University and University of Tennessee. Today they are extensively used for pine plantations dominated by species such as loblolly pine and hardwood stands including oaks managed by companies connected to the U.S. forestry industry and conservation programs under the Natural Resources Conservation Service. Management challenges for agriculture and forestry have been the focus of studies at Vanderbilt University and state agricultural experiment stations, addressing yield constraints linked to acidity, nutrient retention, and erosion on sloping terrain near urbanizing regions like Raleigh, North Carolina.
Cecil series soils influence watershed hydrology and nutrient cycling in basins draining to rivers such as the Savannah River, Santee River, and Chattahoochee River, affecting habitats for fauna monitored by agencies like the U.S. Fish and Wildlife Service and research programs at the Smithsonian Environmental Research Center. Their depth to saprolite and physical properties regulate infiltration and runoff during extreme weather events related to systems like Hurricane Hugo and Hurricane Floyd, with implications for sediment transport to estuaries including the Charleston Harbor and Savannah River Estuary. Ecologically, these soils support diverse plant communities within ecoregions recognized by the Environmental Protection Agency and conservation initiatives by organizations such as The Nature Conservancy.
Conservation practices for Cecil series soils promoted by the Natural Resources Conservation Service and state extension services include contour farming, terracing, lime and fertilizer amendments guided by analyses from labs at Pennsylvania State University, reforestation and afforestation projects aided by U.S. Forest Service programs, and riparian buffers implemented under initiatives like the Conservation Reserve Program. Urban planners in municipalities like Atlanta, Georgia and Charlotte, North Carolina integrate soil survey data into land-use zoning and stormwater management influenced by regulations from agencies such as the Environmental Protection Agency and state environmental departments. Ongoing research at universities including Duke University and Clemson University continues to refine best practices for sustaining productivity and ecosystem services on lands underlain by these soils.
Category:Ultisols Category:Soil types of the United States