Martin County Soil Data
Martin County, Texas
Avg pH
7.8
Texture
Fine sandy loam
Drainage
Well drained
Organic Matter
1.2%
Hydrologic Group
B
Data Story
About Soil in Martin County, Texas
Alkaline Inceptisols of the High Plains
Martin County sits on Inceptisols with an average pH of 7.81, which is significantly more basic than the national median of 6.5. These relatively young soils are less weathered than those in wetter climates. The alkaline nature reflects the arid conditions of the West Texas landscape.
Fine Sandy Loam Dynamics
The soil is a fine sandy loam made of 56.9% sand, 22.8% silt, and 20.3% clay. This high sand content ensures excellent workability and easy root penetration for crops. However, this mix also means the soil drains quickly and may struggle to hold onto mobile nutrients like nitrogen.
Arid Fertility Challenges
Organic matter is lower than average at 1.22%, trailing the Texas state benchmark of 1.66%. The available water capacity of 0.131 in/in sits just below the state average of 0.133. These numbers indicate that consistent irrigation and organic amendments are vital for successful farming here.
Well-Drained Ground for Steady Building
These soils are classified as well-drained and belong to hydrologic group B. This group represents a moderate infiltration rate and a relatively low risk of runoff compared to heavier clays. These characteristics make the county well-suited for stable construction and traditional cotton farming.
Resilient Gardening in Zone 8a
Martin County resides in USDA hardiness zone 8a, supporting heat-hardy staples like cotton, sorghum, and peppers. Success depends on choosing drought-tolerant varieties that can handle the alkaline soil pH. Local gardeners should prioritize mulching to conserve moisture in this sun-drenched environment.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group B — Moderate Runoff
Moderately deep, moderately well-drained soils with moderate infiltration rates. Good balance of drainage and water retention.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Fine sandy loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Martin County have?
Martin County's soil is classified as Fine sandy loam. This indicates the relative proportions of sand, silt, and clay — 57% sand, 23% silt, and 20% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Martin County's soil acidic or alkaline?
Martin County's soil has a pH of 7.8, which is mildly to moderately alkaline. Sulfur amendments can lower pH if needed.
What is the drainage class for Martin County?
Martin 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 Martin County's soil?
Based on Martin County's Fine sandy loam texture, pH of 7.8, and Well drained, the soil is well suited for drought-tolerant crops and native grasses, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Martin County?
Martin County's dominant soil order is Inceptisols. Inceptisols are young soils with weak horizon development. They occur in a wide range of climates and parent materials.
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Other Counties in Texas
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.