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6/1/12 <br />Official Series Description - COLBY Series <br />COMPETING SERIES: These ae Bainville, Manuel, Minnequa, and a Ford series. Bainville and <br />Minnequa soils have paralithic contact within 40 inches. Manvel soils have more than 5 percent calcium <br />carbonate equivalent in the surface. Rocky Ford soils have a thick non-made Ap horizon. <br />GEOGRAPHIC SETTING: Colby soils are on nearly level to steep hills and plains. Slope gradients are <br />commonly 3 to 15 percent but range from 0 to 60 percent. The soils formed in calcareous silty loess. Mean <br />annual precipitation ranges from 13 to 20 inches, and mean annual temperature ranges from 45 to 55 degrees F. <br />GEOGRAPHICALLY ASSOCIATED SOILS: These are the Keith, Richfield, and U /sses soils, all ofwhich <br />have mollic epipedons. Keith and Richfield soils comnionly are on the nearly level areas above the Colby. <br />Ulysses soils are on gently sloping to strongly sloping areas above Colby soils. <br />DRAINAGE AND PERMEABILITY: Well drained to somewhat excessively drained. Runoff is low to very <br />high. Permeability is moderate. <br />USE AND VEGETATION: Mostly m native range. The less sloping areas are cultivated to irrigated wheat and <br />sorghum Native vegetation is mostly short grasses. <br />DISTRIBUTION AND EXTENT: Western Kansas, eastern Colorado, western Nebraska, southwestem <br />South Dakota, and eastern Montana in MLRA 64, 67, and 72. The series is extensive. <br />MLRA SOIL SURVEY REGIONAL OFFICE (MO) 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 recognized is ochric <br />epipedon (A horizon) <br />National Cooperative Soil Survey <br />U.S.A. <br />https: / /soilseries.sc.egov .usda.gov /OSD_Docs /C /COLBY.html 212 <br />