Putnam County Soil Data
Putnam County, Missouri
Avg pH
6.3
Texture
Silty clay loam
Drainage
Well drained
Organic Matter
2.8%
Hydrologic Group
C
Data Story
About Soil in Putnam County, Missouri
Robust Silty Clay Loams in Putnam
Putnam County features a silty clay loam texture with a pH of 6.34, which is more alkaline than the state average of 6.09. These Entisols provide a solid foundation for agriculture along the northern border. This pH level is near-optimal for most traditional Midwestern row crops.
Dense Mix for Nutrient Efficiency
The ground contains 52.9% silt and 25.9% clay, creating a dense material that holds nutrients very effectively. The 21.2% sand content helps maintain essential porosity in this otherwise heavy mix. This balance supports strong root systems and high crop yields.
Superior Water Storage for Crops
With 2.83% organic matter, these soils are healthier than the national average of 2.0%. The available water capacity of 0.200 in/in is also higher than the Missouri average of 0.183 in/in. This extra water storage helps plants survive through the heat of late summer.
Well Drained but Slower Infiltration
The soil is classified as well drained but falls into hydrologic group C, meaning water moves through the profile slowly. This keeps moisture available for crops longer during peak summer months but can lead to surface runoff. Proper field management can help direct excess water safely.
Cooler Season Success in Zone 5b
A slightly cooler zone 5b means a shorter season, but the high water capacity is perfect for corn, beans, and hardy tubers. The nutrient-rich loam provides everything a gardener needs for a high-yield harvest. Dig into your garden now to maximize the potential of this northern soil.
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 Putnam County have?
Putnam County's soil is classified as Silty clay loam. This indicates the relative proportions of sand, silt, and clay — 21% sand, 53% silt, and 26% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Putnam County's soil acidic or alkaline?
Putnam 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 Putnam County?
Putnam 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 Putnam County's soil?
Based on Putnam 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 Putnam County?
Putnam 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 Putnam County on LawnByCounty.com →
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.