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Ken Ramsey Kaylon D, Caleb Wynn(2Swagg)

Port Silt Loam

Status Update

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Located In

Oklahoma, United Sates

: Port silt loam--cultivated. (Colors are for dry soil unless otherwise stated.)

Ap--0 to 9 inches; reddish brown (5YR 4/3) silt loam, dark reddish brown (5YR 3/3) moist; moderate medium granular structure; soft, very friable; neutral; clear smooth boundary. (0 to 11 inches thick)

A--9 to 27 inches; dark reddish brown (5YR 3/3) silt loam, dark reddish brown (5YR 2/2) moist; moderate coarse granular structure; slightly hard, friable; neutral; gradual smooth boundary. (10 to 30 inches thick)

Bk--27 to 42 inches; reddish brown (5YR 4/4) silty clay loam, dark reddish brown (5YR 3/4) moist; weak fine subangular blocky structure; hard, firm; few thin strata of darker material; common masses and films of calcium carbonate; strongly effervescent; moderately alkaline; diffuse smooth boundary. (0 to 25 inches thick)

C--42 to 72 inches; reddish brown (2.5YR 5/4) silt loam, reddish brown (2.5YR 4/4) moist; massive; hard, firm; few thin strata of dark reddish brown silty clay loam; common masses and films of calcium carbonate; strongly effervescent; moderately alkaline.

Taxanomic Class

Fine-silty, mixed, superactive, thermic Cumulic Haplustolls

Range and Characteristics

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Silty-Silt is the super-fine dirt that you might see at the bottom of a lake or river.

Thermic- of or relating to heat.

Geographic Setting

Depth of secondary calcium carbonates ranges from 20 to 60 inches. Thickness of the mollic epipedon ranges from 20 to 40 inches. The A, Bk/Bw, and C horizons are silt loam, loam, silty clay loam, or clay loam.

The Ap or A horizon has hue of 2.5YR to 10YR, value of 3 to 5, and chroma of 1 to 3. Some pedons are overwashed with fine sandy loam or textures similar to the A horizon, but have hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4. The overwash material is less than 20 inches thick. Reaction of the Ap or A horizon ranges from moderately acid to slightly alkaline.

The Bk or Bw horizon has hue of 2.5YR to 10YR, value of 3 to 6, and chroma of 1 to 6. Reaction ranges from slightly acid to moderately alkaline. Visible calcium carbonate in the form of masses and films ranges from 0 to 5 percent by volume.

The C horizon has hue of 2.5YR to 7.5YR, value of 3 to 6, and chroma of 1 to 6. Thin strata of coarser or fine textures occur in this horizon. Reaction is moderately alkaline and calcareous. Visible calcium carbonate in the form of masses and films ranges from 0 to 5 percent by volume.

Some pedons have buried horizons below 30 inches. These pedons are not diagnostic. Texture, color, and reactions of these horizons are similar to those described throughout the Port profile.

Port soils are on nearly level or very gently sloping flood plains in the eastern part of the Central Rolling Red Plains and in the Central Rolling Red Prairies. Slopes range from 0 to 3 percent. The soil formed in calcareous loamy alluvium of Recent age. Mean Annual Precipitation: 26 to 40 inches. Mean Annual Temperature: 57 to 64 degrees F. Thornthwaite Annual P-E indices: 44 to 64. Frost free days range from 185 to 220.

Photos

DRAINAGE AND PERMEABILITY

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USE AND VEGETATION

Permeable-allowing liquids or gases to pass through it.

Port soils are well drained. Runoff is negligible on 0 to 1 percent slopes and very low on 1 to 3 percent slopes. Permeability is moderate. These soils are occasionally or frequently flooded for very brief periods during March to October.

Mainly cultivated to alfalfa, small grains, grain sorghum, and cotton. Some areas are used for tame pasture or rangeland for grazing beef cattle. Native vegetation is tall grasses with an overstory of pecan, black walnut, bur oak, and eastern cottonwood trees.

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