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Official Series Description - OTERO Series LOCATION OTERO CO+KS NE NM OK WY Established Series Rev. LAN/GB/JWB D2/2006 OTERO SERIES Page 1 of 3 The Otero series consists of very deep, well or somewhat excessively drained soils that formed in alluvium and eolian material. Otero soils are on hills, plains, blowouts, ridges, stream terraces, and fans. Slopes are 0 to 20 percent. The mean annual precipitation is 36 centimeters (14 inches) and the mean annual temperature is 11 degrees C. (51 degrees F.) at the type location. TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, calcareous, mesic Aridic Ustorthents TYPICAL PEDON: Otero sandy loam -grassland. (Colors aze for dry soil unless otherwise noted.) A--O to IS centimeters (0 to 6 inches); grayish brown (lOYR 5/2) sandy loam, dazk grayish brown (1 OYR 4/2) moist; weak very fine granulaz structure; soft, very friable; strongly effervescent; moderately alkaline (pH 8.0); clear smooth boundary. (8 to 20 centimeters (3 to 8 inches) thick) AC--IS to 36 centimeters (6 to 14 inches); light brownish gray (lOYR 6/2) sandy loam, dark grayish brown (lOYR 4/2) moist; very weak medium subangulaz blocky structure parting to weak coarse granular; soft, very friable; strongly effervescent; moderately alkaline (pH 8.0); gradual smooth boundary. (0 to 23 centimeters (0 to 9 inches) thick) C--36 to 152 centimeters (14 to 60 inches); very pale brown (lOYR 7/3) sandy loam, brown (lOYR 5/3) moist; massive; slightly hard, very friable; secondary calcium carbonate occurring discontinuously and at variable depths in the form of soft masses, and in thin seams and streaks; violently effervescent; moderately alkaline (pH 8.2). TYPE LOCATION: Baca County, Colorado; approximately 563 meters (1,848 feet) west and 61 meters (200 feet) north of the southeast corner of Sec. 6, T. 31 S., R. 50 W. RANGE IN CHARACTERISTICS: Soil moisture: moist in some part of the moisture control section for about 40 to 90 cumulative days while the soil temperature is 5 degrees C. (41 degrees) or higher; moist intermittently April though August Moisture regime: ustic bordering on aridic _ Mean annual soil temperature: 8 to 14 degrees C. (47 to 58 degrees F.) -~~ -- Mean summer soil temperature: 15 to 26 degrees C. (59 to 79 degrees F.) Depth to secondary calcium carbonate: at the surface, but aze noncalcareous for 3 to 25 centimeters (1 to 10 inches) in some pedons. The weighted average organic carbon content surface 15 inches: 0 to 1 percent, and the organic carbon decreases uniformly with increasing depth Sand/clay ratios: 3 to 15 Particle size control section: Clay content: 5 to 18 percent Silt content: 5 to 35 percent Sand content: 50 to 82 percent, with 15 to 35 percent being fine or coarser sand Rock fragment content: typically less than 2 percent, ranges from 0 to 15 percent. A horizon or AC (if present): Hue: 7.SYR to SY Value: 4 to 7. and 3 to 6 moist http://www2. ftw.nres.usda.gov/osd/dat/O/OTERO.html 11 /02/2006