Van Buren County Soil Data
Van Buren County, Iowa
USDA SSURGO / PHZMAvg pH
6.1
Texture
Silty clay loam
Drainage
Somewhat poorly drained
Organic Matter
2.5%
Hydrologic Group
D
Data Story
About Soil in Van Buren County, Iowa
Alfisols and Silty Clay Loams in Van Buren
Van Buren County is dominated by Alfisols, which typically form under forest cover. The average pH of 6.11 is more acidic than the national median of 6.5, suggesting a need for lime to optimize crop growth. This silty clay loam profile defines much of the local landscape's productive potential.
A Silty Mix with Moderate Clay
The soil contains a heavy 55.7% silt and 24.2% clay, which provides a dense, workable texture. With only 19.2% sand, this mixture retains nutrients well but requires careful management to avoid compaction. The high silt content ensures the ground remains fertile and holds its shape under cultivation.
Steady Moisture but Lower Organic Matter
Organic matter sits at 2.48%, falling significantly below the Iowa state average of 3.81%. However, the available water capacity of 0.194 in/in is nearly identical to the state benchmark of 0.195 in/in. This means the soil is excellent at holding onto water for plants, even if it lacks the high carbon content found elsewhere in the state.
Navigating Poorly Drained Hydrologic Group D
Classified as somewhat poorly drained, these soils belong to hydrologic group D, which indicates a high runoff potential when wet. This can lead to ponding in low spots, making drainage tile essential for large-scale farming. For home builders, this classification suggests a need for robust basement waterproofing and site grading.
Growing Success in Zone 5b
Positioned in USDA Hardiness Zone 5b, this county is perfect for hardy perennials like asparagus and rhubarb. The silty clay loam supports heavy feeders such as corn and leafy greens if the pH is managed. Start your garden this spring with cold-hardy varieties to take advantage of the high water retention.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group D — High Runoff
Clay soils with very slow infiltration rates. Highest runoff potential. These soils have a permanent high water table or are shallow over impervious material.
Drainage Class
Somewhat poorly drained
Water is removed slowly enough that the soil is wet at shallow depths for significant periods. Mottling present.
Soil Profile
Dominant texture: Silty clay loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Clay Soil Detected
Clay soils can struggle with drainage. These products improve soil structure and water flow.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Van Buren County have?
Van Buren County's soil is classified as Silty clay loam. This indicates the relative proportions of sand, silt, and clay — 19% sand, 56% silt, and 24% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Van Buren County's soil acidic or alkaline?
Van Buren County's soil has a pH of 6.1, which is moderately acidic. This range suits many crops and is common across much of the eastern US.
What is the drainage class for Van Buren County?
Van Buren County has a dominant drainage class of "Somewhat poorly drained." Poorly drained soils retain water for extended periods, which can limit crop choices and may require tile drainage or raised beds.
What crops or plants grow well in Van Buren County's soil?
Based on Van Buren County's Silty clay loam texture, pH of 6.1, and Somewhat poorly drained, the soil is well suited for vegetables, grains, and most field crops, row crops and vegetable gardens, rice, cranberries, and other water-tolerant species.
What USDA soil order is found in Van Buren County?
Van Buren 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.
Soil & Planting Advisory: Van Buren County
Soil Verdict
Van Buren County is in USDA hardiness zone 5b, a cold climate zone. where winter lows can reach -15°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
Van Buren County closely matches the Iowa average hardiness conditions. The zone range of 5b-6a within the county means soil and planting decisions should account for local elevation and topography.
Planning your lawn? View lawn care data for Van Buren County on LawnByCounty.com →
Other Counties in Iowa
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.