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Official Series Description-OKY_FORD Series • Page I of 2 <br /> ' LOCATION ROCKY FORD CO <br /> ' Established Series <br /> Rev. AJC <br /> 02/97 <br /> ROCKY FORD SERIES <br /> Typically, Rocky Ford soils have grayish brown very calcareous clay loam manmade Ap horizons <br /> and pale brown calcareous loam C horizons. <br /> ' TAXONOMIC CLASS: Fine-silty, mixed, calcareous, mesic Ustic Torriorthents <br /> ' TYPICAL PEDON: Rocky Ford clay loam -cultivated(Colors are for dry soil unless otherwise <br /> noted.) <br /> ' AP-0 to 12 inches; grayish brown(slightly darker than 1 OYR 5/2)clay loam,dark grayish brown <br /> (slightly darker than 10YR 4/2) moist; weak coarse subangular blocky structure that parts to fine and <br /> very fine granules; slightly hard, very friable, slightly sticky, slightly plastic; primary peds are hard, <br /> ' firm; moderate amounts of undecomposed and partially decomposed organic materials; calcareous; <br /> moderately alkaline(pH 8.0); abrupt smooth boundary. (10 to 20 inches thick) <br /> Cca-12 to 60 inches; pale brown(IOYR 6/3) loam,brown (IOYR 5/3)moist; massive; hard, friable, <br /> slightly sticky, slightly plastic; visible secondary calcium carbonate occurring mostly as small <br /> concretions or in seams and streaks throughout the horizon;calcareous; moderately alkaline (pH 8.2). <br /> ' TYPE LOCATION: Prowers County, Colorado; .3 mile north and 100 feet east of W IA comer <br /> Sec. 33, T. 22 S.,R. 45 W. <br /> RANGE IN CHARACTERISTICS: These soils are usually calcareous throughout, but are leached <br /> to depths of 2 or 3 inches in some pedons. Gypsum content of a majority of subhorizons in the <br /> control section ranges from 0 to 1.5 percent by weight. Exchangeable sodium ranges from 0 to 14 <br /> percent in a majority of subhorizons of the control section and there is no subhorizon as much as 3 <br /> inches thick above a depth of 20 inches that exceeds 15 percent. Conductivity ranges from 0 to 14 <br /> ' millimhos in most subhorizon of the control section and there is no subhorizon as much as 3 inches <br /> thick above a depth of 20 inches that exceeds 14 millimhos. Continuous subhorizons of genetically <br /> concentrated visible secondary calcium carbonate and/or sulfate do not occur above a depth of 40 <br /> ' inches although some visible calcium carbonate and/or sulfate occurs inconsistently at any depth or <br /> occurs uniformly throughout the profile as a natural feature of the parent material. The control <br /> section is usually loam, clay loam, silt loam or silty clay loam but clay ranges from 18 to 35 percent, <br /> silt from 20 to 60 percent,and sand from 10 to 60 percent with less than 15 percent being fine or <br /> coarser sand. Rock fragments range from 0 to 5 percent and are mainly 1/2 to 10 inches in diameter. <br /> Subhorizon redder than 7.5YR occur in a few pedons but the major part of the control section above <br /> a depth of 40 inches has hue of 7.5YR or yellower. Marinade Ap horizons ranging from 10 to 20 <br /> inches thick that are medium to moderately fine textured, that border mollic epipedons in color and <br /> anthropic epipedons in phosphorous and nitrogen characterize this series. They have resulted from <br /> long irrigation with silt laden irrigation water accompanied by intense cropping, heavy fertilization <br /> and larger than normal yearly returns of organic matter. <br /> t <br />