Martin County Soil Data
Martin County, Indiana
USDA SSURGO / PHZMAvg pH
5.9
Texture
Silt Loam
Drainage
N/A
Organic Matter
2.4%
Hydrologic Group
N/A
Data Story
About Soil in Martin County, Indiana
Slightly acidic silt-rich soils
Martin County soil averages a pH of 5.93, placing it slightly below both the state average of 6.08 and the national median of 6.5. While taxonomic data is currently limited, the soil score of 64.4 reflects a solid base for regional growth. This level of acidity is common in southern Indiana and is manageable for most gardeners with minor amendments.
Dominated by fine silty particles
The county's soil profile is 65.6% silt, which is considerably higher than many neighboring counties. With only 17.7% sand and 16.7% clay, the soil feels floury to the touch and holds moisture well. This high silt content makes the land productive but potentially susceptible to surface crusting and erosion.
High water capacity for plant health
Martin County soil offers an available water capacity of 0.204 in/in, which is slightly better than the state average of 0.202. Organic matter is 2.38%, which is lower than the Indiana average of 4.90% but remains above the national benchmark of 2.0%. This combination ensures that the soil can retain the moisture necessary for healthy plant development.
Unknown drainage requires local testing
Data for dominant drainage classes and hydrologic groups is currently unavailable for this area. Because silt-heavy soils can sometimes drain slowly, it is important to observe how your specific property handles runoff. Proper management of these silty soils often requires careful attention to avoid compaction.
Planting success in Zone 6b
Hardiness zone 6b allows for a long growing season for crops like corn, beans, and various fruit trees. The high silt content and good water capacity provide a reliable environment for both farmers and hobbyists. Consider adding compost to boost the organic matter and unlock the full potential of your Martin County plot.
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
Acidic Soil Detected
Your county's average pH is 5.9. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Martin County have?
Martin County's soil is classified as Silt Loam. This indicates the relative proportions of sand, silt, and clay — 18% sand, 66% silt, and 17% 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 5.9, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Martin County?
Drainage class data is not currently available for Martin County.
What crops or plants grow well in Martin County's soil?
Based on Martin County's Silt Loam texture, pH of 5.9, 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 Martin County?
The dominant USDA soil order for Martin County is not currently available in our dataset.
Soil & Planting Advisory: Martin County
Soil Verdict
Martin County is in USDA hardiness zone 6b, a moderate climate zone. where winter lows can reach -5°F. Freeze-thaw cycles are moderate; soil biology slows in winter but recovers reliably in spring, supporting a broad range of plants.
Planting Guidance
A wide plant palette is possible: deciduous trees, most shrubs, cool-season vegetables, and many perennials thrive here. Winter protection (mulch, burlap wraps) helps push the zone boundary for desired species. Always match plant selections to the specific microclimate of your property — low spots, slopes, and wind exposure can shift effective hardiness by half a zone.
Soil Implications
Moderate freeze-thaw cycles naturally aerate the soil but can also cause compaction in clay-heavy areas; annual core aeration is beneficial. Organic matter amendments decompose at a moderate pace — aim for 3-5% organic content for optimal fertility. When soil temperatures drop below freezing, microbial nitrogen cycling stops; spring fertilization is more effective than late-fall application.
Regional Context
Martin County closely matches the Indiana average hardiness conditions.
Planning your lawn? View lawn care data for Martin County on LawnByCounty.com →
Other Counties in Indiana
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.