Audrain County Soil Data
Audrain County, Missouri
Avg pH
6.3
Texture
Silty clay loam
Drainage
Well drained
Organic Matter
2.2%
Hydrologic Group
C
Data Story
About Soil in Audrain County, Missouri
Audrain's Balanced Entisols
Audrain County sits on Entisols with a pH of 6.34, placing it comfortably near the national median of 6.5. This silty clay loam is less acidic than the Missouri average, which usually hovers around 6.09.
Silky Silty Clay Loams
The composition is dominated by 65.3% silt, with 13.7% sand and 20.6% clay providing structure. This high silt percentage makes the soil silky to the touch and very easy for roots to penetrate.
Elite Water Capacity
The county excels in water storage with an Available Water Capacity of 0.208 in/in, far surpassing the state average of 0.183. While organic matter at 2.22% is lower than the state average, it still exceeds the national average of 2.0%.
Reliable Drainage for Farming
As a well-drained soil in Hydrologic Group C, Audrain manages rainfall effectively for agricultural use. These properties make it reliable for consistent crop yields and stable for light construction projects.
Ideal Growth in Zone 6b
In Hardiness Zone 6b, gardeners have a long growing season for peppers, tomatoes, and melons. The exceptional water capacity means your plants will stay hydrated even during the hot Missouri July.
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
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Silty clay loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Audrain County have?
Audrain County's soil is classified as Silty clay loam. This indicates the relative proportions of sand, silt, and clay — 14% sand, 65% silt, and 21% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Audrain County's soil acidic or alkaline?
Audrain 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 Audrain County?
Audrain County has a dominant drainage class of "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 Audrain County's soil?
Based on Audrain County's Silty clay loam texture, pH of 6.3, and 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 Audrain County?
Audrain County's dominant soil order is Entisols. Entisols are recently formed soils with little to no horizon development. They are common on floodplains, steep slopes, and sandy deposits.
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Other Counties in Missouri
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.