Iowa Soil Property Maps (gSSURGO)

Available Water Capacity
Available Water Capacity

Volume of water held by the soil matrix available for plant uptake.

Available Soil Water Storage
Available Soil Water Storage

Cumulative supply volume of water held by the soil matrix.

Soil Organic Matter
Soil Organic Matter

The concentration of humified organic material in the soil matrix.

Soil Bulk Density - one-third bar
Soil Bulk Density – one-third bar

The mass of soil at one-third bar (wilting point) suction per unit bulk volume.

Soil Water Content - minus one-third bar
Soil Water Content – minus one-third bar

Volume of water held by the soil matrix at negative one-third bar (field capacity) suction.

Soil Water Content - minus fifteen bar
Soil Water Content – minus fifteen bar

Volume of water held by the soil matrix at negative fifteen bar (wilting point) suction.

Soil Sand Content
Soil Sand Content

Percent of the sand particle size fraction (0.05-2 mm) in the soil matrix.

Soil Silt Content
Soil Silt Content

Percent of the silt particle size fraction
(0.05-0.002 mm) in the soil matrix.

 Soil Clay Content
Soil Clay Content

Percent of the clay particle size fraction (<0.002 mm) in the soil matrix.

Soil Saturated Hydraulic Conductivity (Ksat)
Soil Saturated Hydraulic Conductivity (Ksat)

The rate of saturated water flow through the soil matrix.

Soil pH (1:1 suspension)
Soil pH (1:1 suspension)

The concentration of hydrogen ions in a 1:1 soil-water suspension.

Depth to Water Table
Depth to Water Table

The depth to permanent saturation of the soil matrix.

Soil Drainage Class
Soil Drainage Class

The frequency and duration of wet periods under conditions similar to those under which the soil formed.

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