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Official Series Description-OCKY_FORD Series • Page 2 of <br /> ' The A horizon has hue of 2.5Y through 7.5YR, value of 5 through 7 dry, 3 through 6 moist, and <br /> chroma of l through 4. It is moderately or strongly alkaline(1:5 dilution unbuffered organic dye). <br /> The C horizon has hue of 2.5Y through 7.5YR. Subhorizons redder than 7.5YR occur in some <br /> pedons. This horizon is moderately or strongly alkaline (1:5 dilution unbuffered organic dye). <br /> Calcium carbonate equivalent of the fine earth ranges from about 1 to 10 percent. <br /> COMPETING SERIES: These are the Bainville, Colby, Manvel, and Minnequa series. Bainville <br /> ' and Minnequa soils have a paralithic contact at depths of less than 40 inches. Colby soils lack a thick <br /> manmade nitrogen and phosphorous enriched Ap horizon. Manvel soils have a calcium carbonate <br /> equivalent of 10 percent or more in most subhorizons above a depth of 40 inches and lack a thick <br /> manmade Ap horizon. <br /> GEOGRAPHIC SETTING: Rocky Ford soils are on nearly level to gently sloping terraces and <br /> ' alluvial fans. Slopes typically range from about 0 to 6 percent or more. The soils formed in thick <br /> calcareous eolian or silty uniform alluvium containing much very fine sand and modified by long <br /> irrigation. At the type location the mean annual precipitation is about 15 inches with peak periods of <br /> precipitation in the spring and early summer months. Mean annual temperature is 52 degrees F. and <br /> mean summer temperature is 79 degrees F. <br /> ' GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Colby soils and the <br /> NeWsta soils. Nepesta soils have an argillic horizon. <br /> ' DRAINAGE AND PERMEABILITY: Well-drained; slow to very runoff; moderate to slow <br /> permeability. <br /> ' USE AND VEGETATION: Used as irrigated cropland. Principal irrigated crops are alfalfa, small <br /> grains, sorghum, com, truck crops, and melons. <br /> DISTRIBUTION AND EXTENT: Arkansas River Valley, Colorado. The series is of moderate <br /> extent. <br /> MLRA OFFICE RESPONSIBLE: Salina,Kansas <br /> SERIES ESTABLISHED: Prowers County, Colorado 1963. <br /> ' REMARKS: OSED scanned by NSSQA. Last revised by state on 4/73. <br /> National Cooperative Soil Survey <br /> ' U.S.A. <br />