Distribution of Alfisols in Iowa
Author: Bradley Miller
This map illustrates the distribution of Alfisols across Iowa. Alfisols are moderately weathered soils that typically form under hardwood forest vegetation. They are characterized by a subsurface accumulation of clay (argillic horizon) and relatively high base saturation, making them fertile and suitable for agriculture when managed properly.
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Source:
Catherine DeLong, Burras Pedology Group
Department of Agronomy
Iowa State University
Interpretation:
Alfisols are found mainly in eastern and southeastern Iowa, particularly in areas historically dominated by forest cover. Their clay-enriched subsoil enhances nutrient retention and water-holding capacity, contributing to moderate to high productivity depending on slope and drainage characteristics.
Resolution:
10-meter raster resolution; displayed as a statewide static image
Suggested Use:
Valuable for soil fertility assessment, land use planning, and understanding forest-to-agriculture transitions. Also relevant for identifying regions with higher clay content and potential for erosion if not properly managed.
References:
Natural Resource Conservation Service (2013) and Iowa Soil Properties and Interpretations Database (7.3)