Pullman soil series
A representative soil profile of Pullman clay loam, 0 to 1 percent slopes, showing minor accumulations of secondary carbonates at about 80 centimeters and a strong calcic horizon at about 135 centimeters. (Soil Survey of Deaf Smith County, Texas; by Thomas C. Byrd, Natural Resources Conservation Service)
The Pullman series consists of very deep, well drained, slowly permeable soils that formed in clayey eolian deposits from the Blackwater Draw Formation of Pleistocene age. These soils occur on nearly level to very gently sloping plains or playa slopes. Slope ranges from 0 to 3 percent. The mean annual precipitation is about 483 mm (19 in) and the mean annual temperature is about 16 degrees C (60 degrees F).
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Torrertic Paleustolls
Soil moisture: An ustic moisture regime bordering on aridic. The soil moisture control section is dry in some or all parts for more than 180 but less than 220 days, cumulative, in normal years.
Mean annual soil temperature: 15 to 18 degrees C (59 to 64 degrees F).
Thickness of the mollic epipedon: 30 to 76 cm (12 to 30 in).
Linear extensibility of top 1 m (40 in): 6 to 9 cm.
Depth to secondary carbonates: 50 to 76 cm (20 to 30 in).
Depth to calcic horizon: 76 to 150 cm (30 to 60 in).
Solum thickness: more than 203 cm (80 in).
Particle-size control section:
Silicate clay content: 35 to 50 percent
Carbonate clay content: 0 to 3 percent
USE AND VEGETATION:
Mainly cultivated to irrigated and dryland cotton, corn, grain sorghum, and winter wheat. Climax vegetation in rangeland includes blue grama and buffalograss, with lesser amounts of vine-mesquite, western wheatgrass, galleta or tobosa, silver bluestem, wild alfalfa, and prairie clover. This soil has been correlated to the Deep Hardland (R077CY022TX) ecological site in MLRA-77C.
DISTRIBUTION AND EXTENT:
General area: Western Texas
Land Resource Region: H - Central Great Plains Winter Wheat and Range Region
MLRA 77C - Southern High Plains, Southern Part
Extent: Large. This is a benchmark soil.
A benchmark soil is one of large extent within one or more major land resource areas (MLRAs), one that holds a key position in the soil classification system, one for which there is a large amount of data, one that has special importance to one or more significant land uses, or one that is of significant ecological importance.
For additional information about the survey area, visit:
www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/texas/TX117/0/...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/P/PULLMAN.html
For acreage and geographic distribution, visit:
casoilresource.lawr.ucdavis.edu/see/#pullman
Pullman soil series
A representative soil profile of Pullman clay loam, 0 to 1 percent slopes, showing minor accumulations of secondary carbonates at about 80 centimeters and a strong calcic horizon at about 135 centimeters. (Soil Survey of Deaf Smith County, Texas; by Thomas C. Byrd, Natural Resources Conservation Service)
The Pullman series consists of very deep, well drained, slowly permeable soils that formed in clayey eolian deposits from the Blackwater Draw Formation of Pleistocene age. These soils occur on nearly level to very gently sloping plains or playa slopes. Slope ranges from 0 to 3 percent. The mean annual precipitation is about 483 mm (19 in) and the mean annual temperature is about 16 degrees C (60 degrees F).
TAXONOMIC CLASS: Fine, mixed, superactive, thermic Torrertic Paleustolls
Soil moisture: An ustic moisture regime bordering on aridic. The soil moisture control section is dry in some or all parts for more than 180 but less than 220 days, cumulative, in normal years.
Mean annual soil temperature: 15 to 18 degrees C (59 to 64 degrees F).
Thickness of the mollic epipedon: 30 to 76 cm (12 to 30 in).
Linear extensibility of top 1 m (40 in): 6 to 9 cm.
Depth to secondary carbonates: 50 to 76 cm (20 to 30 in).
Depth to calcic horizon: 76 to 150 cm (30 to 60 in).
Solum thickness: more than 203 cm (80 in).
Particle-size control section:
Silicate clay content: 35 to 50 percent
Carbonate clay content: 0 to 3 percent
USE AND VEGETATION:
Mainly cultivated to irrigated and dryland cotton, corn, grain sorghum, and winter wheat. Climax vegetation in rangeland includes blue grama and buffalograss, with lesser amounts of vine-mesquite, western wheatgrass, galleta or tobosa, silver bluestem, wild alfalfa, and prairie clover. This soil has been correlated to the Deep Hardland (R077CY022TX) ecological site in MLRA-77C.
DISTRIBUTION AND EXTENT:
General area: Western Texas
Land Resource Region: H - Central Great Plains Winter Wheat and Range Region
MLRA 77C - Southern High Plains, Southern Part
Extent: Large. This is a benchmark soil.
A benchmark soil is one of large extent within one or more major land resource areas (MLRAs), one that holds a key position in the soil classification system, one for which there is a large amount of data, one that has special importance to one or more significant land uses, or one that is of significant ecological importance.
For additional information about the survey area, visit:
www.nrcs.usda.gov/Internet/FSE_MANUSCRIPTS/texas/TX117/0/...
For a detailed soil description, visit:
soilseries.sc.egov.usda.gov/OSD_Docs/P/PULLMAN.html
For acreage and geographic distribution, visit:
casoilresource.lawr.ucdavis.edu/see/#pullman