Marion County Soil Data
Marion County, Illinois
Avg pH
6.3
Texture
Silt Loam
Drainage
N/A
Organic Matter
1.9%
Hydrologic Group
N/A
Data Story
About Soil in Marion County, Illinois
Slightly Acidic Soils of the Interior
Marion County soils average a pH of 6.32, making them slightly more acidic than the national median of 6.5. This pH level is common for the region and remains within the healthy range for most agricultural production.
Fine Texture and High Silt
The soil contains 68.1% silt and 19.0% clay, creating a fine-textured environment that retains moisture well. The 13.0% sand content is relatively low, meaning the soil feels smooth and holds its shape when wet.
Consistent Water Storage Potential
Organic matter levels reach 1.92%, just under the national average and significantly below the state average of 2.94%. However, an available water capacity of 0.207 in/in helps the soil act as a reliable reservoir for plant roots.
Awaiting Local Hydrology Data
Specific federal data for dominant drainage classes and taxonomic orders is currently unavailable for this area. Based on the 69.0 soil score, residents should focus on adding compost to improve structure and natural drainage over time.
Success in Zone 6b
Marion County is situated in USDA Hardiness Zone 6b, allowing for a diverse range of perennial flowers and vegetables. The soil provides a stable base for home gardens if you manage for the slightly lower organic content.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Silt Loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Marion County have?
Marion County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 13% sand, 68% silt, and 19% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Marion County's soil acidic or alkaline?
Marion County's soil has a pH of 6.3, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Marion County?
Drainage class data is not currently available for Marion County.
What crops or plants grow well in Marion County's soil?
Based on Marion County's Silt Loam texture, pH of 6.3, and drainage class, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens.
What USDA soil order is found in Marion County?
The dominant USDA soil order for Marion County is not currently available in our dataset.
Planning your lawn? View lawn care data for Marion County on LawnByCounty.com →
Other Counties in Illinois
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.