Corn Suitability Ratings & Soil Interpretations

Key to Soils Within Major Soil Associations of Iowa

  • Prairie-Derived Upland Soils of NW IA – Table (Nov 2006)
  • Loess-Derived Soils of East-Central IA – Table (Jan 2007)

Iowa Corn Suitability Rating 2 (CSR2)

  • CSR2 Equation and Component Values – Equation (Mar 2015)
  • County Weighted Average CSR2 – Map (May 2017)
  • Iowa CSR2 Distribution – Map (Jan 2016)
  • ISU Extension: “Computing the Iowa Corn Suitability Rating for Your Farm – Article (Jun 2014)
  • Iowa Farmer Today: “ISU tweaks CSR” – Article (May 2015)
  • Integrated Crop Management NEWS: “CSR2 Equation Updated” – Article (Apr 2015)
  • A Comparison of Iowa’s Original CSR Index to the new CSR2 Index – Poster (Apr 2015)
  • CSR2 Background, Update, and Frequently Asked Questions – FAQ (May 2013)
  • ISU CALS: “ISU Updates Method for Rating Soil Productivity” – News Release (May 2013)
  • Major Land Resource Areas (MLRA) within Iowa – Map (May 2015)
  • USDA-NRCS Areas and Office Locations within Iowa – Map (May 2015)
  • Average Precipitation for Iowa (1981 – 2010) – Map (Sep 2012)

Soil Interpretations

  • Soil Map Units (SMU’s) requiring Tile Drainage to Achieve Optimal Agronomic Yields for Row Crops
  • SMU’s suitable for Vineyards.

PDF files are available as one file containing all counties in the state or as one file for each county. Tables are updated through January 2010.

  • Landform Regions in Iowa – Map
  • Soil Associations of Iowa: STATSGO Database – Map
  • Principal Soil Associations and Major Soil Areas in Iowa – Map
  • Distribution of Alfisols in Iowa – Map (2013)
  • Distribution of Entisols in Iowa – Map (2014)
  • Distribution of Histosols in Iowa – Map (2013)
  • Distribution of Inceptisols in Iowa – Map (2013)
  • Distribution of Mollisols in Iowa – Map (2013)
  • Estimated Iowa Farmland by Slope Gradient – Figure (2015)
  • Summary of Soil Orders in Iowa – Table (Nov 2013)
  • The Top 10 Soil Series and Map Units – Table (Mar 2010)
  • County Weighted Average Carbon Index – Map (Apr 2005)
  • Summary of slope ranges within each Slope Class – Table (Oct 2013)
  • By county Land Capability Class (LCC) summary – Table (Jan 2011)
  • Iowa Land Capability Class (LCC) Distribution – Map (Jan 2016)
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