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Official Series Description - COLBY Series Page 2 of 2 <br />and the horizon is not regarded as definitive for the series. <br />COMPETING SERIES: These are the Bainville, Manuel, Mirinegua, and Rocky Ford series. <br />Bainville and Minnequa soils have paralithic contact within 40 inches. Manuel soils have more than <br />5 percent calcium carbonate equivalent in the surface. Rocky Ford soils have a thick man-made Ap <br />horizon. <br />GEOGRAPHIC SETTING: Colby soils are on nearly level to steep hills and plains. Slope <br />gradients are commonly 3 to 15 percent but range from 0 to 60 percent. The soils formed in <br />calcareous silty loess. Mean annual precipitation ranges from 13 to 20 inches, and mean annual <br />temperature ranges from 45 to 55 degrees F. <br />GEOGRAPHICALLY ASSOCIATED SOILS: These are the Keith, Richteld, and Ulvsses soils, <br />all of which have mollic epipedons. Keith and Richfield soils commonly are on the nearly level <br />areas above the Colby. Ulysses soils are on gently sloping to strongly sloping areas above Colby <br />soils. <br />DRAINAGE AND PERMEABILITY: Well drained to somewhat excessively drained. Runoff is <br />low to very high. Permeability is moderate. <br />USE AND VEGETATION: Mostly in native range. The less sloping areas are cultivated to <br />irrigated wheat and sorghum. Native vegetation is mostly short grasses. <br />DISTRIBUTION AND EXTENT: Western Kansas, eastern Colorado, western Nebraska, <br />southwestern South Dakota, and eastem Montana in MLRA 64, 67, and 72. The series is extensive. <br />MLRA OFFICE RESPONSIBLE: Salina, Kansas <br />SERIES ESTABLISHED: Reconnaissance Soil Survey of Western Kansas, 1910. <br />REMARKS: Colby soils were formerly classfied as Ustic Torriorthents. Diagnostic horizon <br />recognized is ochric epipedon (A horizon) <br />National Cooperative Soil Survey <br />U.S.A. <br />http://wwwstatlab.iastate.edu/cgi-binlosdlosdname.cgi?-P 3/15/2002 <br />