Smith County Soil Data
Smith County, Tennessee
Avg pH
5.6
Texture
Variable
Drainage
N/A
Organic Matter
1.8%
Hydrologic Group
N/A
Data Story
About Soil in Smith County, Tennessee
Young Entisols of Smith County
Smith County features Entisols, which are geologically young soils with an average pH of 5.61. This pH level is slightly more alkaline than the state average of 5.35, though it remains more acidic than the national median of 6.5.
Variable textures with high silt
The soil composition is 56.8% silt and 23.1% clay, providing a heavy texture that supports plant roots well. With only 17.6% sand, the soil retains its shape and nutrients effectively but requires care to maintain aeration.
Consistent moisture retention
At 0.169 in/in, the available water capacity is nearly on par with the Tennessee state average of 0.171 in/in. Organic matter content stands at 1.77%, suggesting that adding compost could help bring it closer to the state average of 2.44%.
Adapting to variable soil conditions
The dominant texture is classified as variable, reflecting the county's shifting topography and river-influenced geology. Growers should observe their specific plots for drainage speed, as the high silt content can sometimes slow water movement.
A fertile start in Zone 7b
Hardiness Zone 7b provides Smith County with a reliable climate for both spring and fall gardening. The silty Entisols are a great foundation for vegetables like tomatoes and peppers, especially when supplemented with organic fertilizers.
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: Variable
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Smith County have?
Smith County's soil is classified as Variable. This indicates the relative proportions of sand, silt, and clay — 18% sand, 57% silt, and 23% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Smith County's soil acidic or alkaline?
Smith County's soil has a pH of 5.6, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Smith County?
Drainage class data is not currently available for Smith County.
What crops or plants grow well in Smith County's soil?
Based on Smith County's Variable texture, pH of 5.6, and drainage class, the soil is well suited for vegetables, grains, and most field crops.
What USDA soil order is found in Smith County?
Smith 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.
Planning your lawn? View lawn care data for Smith County on LawnByCounty.com →
Other Counties in Tennessee
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.