Arkansas County Soil Data
Arkansas County, Arkansas
Avg pH
5.8
Texture
Silt loam
Drainage
Moderately well drained
Organic Matter
1.6%
Hydrologic Group
C
Data Story
About Soil in Arkansas County, Arkansas
Silt Loam Foundations in Arkansas County
Arkansas County is defined by silt loam textures and Alfisols, which are naturally fertile soils often found under forest cover. The average pH of 5.83 sits below the national median of 6.5, though it remains slightly higher than the Arkansas state average of 5.56. These acidic conditions generally require lime supplements for most traditional row crops.
A Silty Mix for Steady Growth
The soil contains 54.3% silt and 23.9% clay, creating a heavy profile that holds nutrients well but can be slow to warm. With only 21.8% sand, these soils offer moderate workability but risk compaction if tilled while wet. This balance makes the region a powerhouse for rice and soybean production where moisture retention is key.
Efficient Water Storage Despite Low Carbon
Organic matter sits at 1.57%, which is notably lower than the state average of 4.15%. However, the available water capacity of 0.172 in/in exceeds the state benchmark of 0.148, indicating the soil is exceptionally good at storing moisture for plants. This efficiency helps crops survive the hot, dry spells common in the Delta.
Managing Moderate Drainage Challenges
The land is classified as moderately well drained and belongs to hydrologic group C. This means the soil has a slow infiltration rate when thoroughly wet, making it prone to runoff during heavy Arkansas rainstorms. Builders and farmers alike must account for this moderate drainage when planning site foundations or irrigation systems.
Abundant Growth in Zone 8b
With a USDA Hardiness Zone of 8b, this county supports a long growing season for heat-loving crops like okra and sweet potatoes. The soil score of 42.4 beats the state average of 37.7, signaling a strong environment for your backyard garden. Start your seeds early to take full advantage of this productive silt loam landscape.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group C — Moderate-High Runoff
Soils with slow infiltration rates, often with a layer that impedes downward water movement. Higher clay content restricts drainage.
Drainage Class
Moderately well drained
Water is removed somewhat slowly. May have a slowly permeable layer or seasonal water table.
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 Arkansas County have?
Arkansas County's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 22% sand, 54% silt, and 24% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Arkansas County's soil acidic or alkaline?
Arkansas County's soil has a pH of 5.8, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Arkansas County?
Arkansas County has a dominant drainage class of "Moderately well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Arkansas County's soil?
Based on Arkansas County's Silt loam texture, pH of 5.8, and Moderately well drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Arkansas County?
Arkansas County's dominant soil order is Alfisols. Alfisols are moderate to high base-status soils with a clay-enriched subsoil. They support productive forests and cropland across temperate regions.
Planning your lawn? View lawn care data for Arkansas County on LawnByCounty.com →
Other Counties in Arkansas
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.