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PHILLIPS COUNTY, COLORADO 19
<br /> Ap-0 to 5 inches, grayish-brown (10YR 5/2) loam, very dark Almost all the acreage is cultivated. The soils in this
<br /> grayish brown (10YR 3/2) when moist;weak, thin to group are well suited to winter wheat barley, sorghums,
<br /> very thick, platy structure that breaks to weak, fine Y�
<br /> granular; hard when dry, friable when moist; non- and corn that are dryfarmed.They also are suited to many
<br /> calcareous; abrupt, smooth boundary. kinds of irrigated crops. In dryfai•med fields,the practice
<br /> B1-5 to 9 inches, dark grayish-brown (10YR 4/2) loam, very Of following small grain or sorghum with summer fallow
<br /> dark grayish brown (10YR 3/2) when moist; moder- helps in maintaining soil moisture and fertility
<br /> . Stubble
<br /> ate, coarse, subangular blocky structure that breaks 1 g y
<br /> to moderate, medium, subangular; slightly hard when mu thing and working crop residue into the soil are prac-
<br /> dry,firm when moist; noncalcareous; about 2 percent tices needed for controlling erosion.
<br /> fine gravel; clear, smooth boundary. In irrigated fields the soils can be leveled so that the.
<br /> B21t-9 to loam,14 inchevery s,
<br /> krgrayishgrayish-brown
<br /> -bro n(10YR 342)) cla when water spreads uniformly. The crops respond well if fer-
<br /> moist; moderate, medium, prismatic structure that tilizer is added. Working crop residue into the soil helps
<br /> breaks to moderate, fine, subangular blocky; hard to control erosion and to maintain fertility and tilth. Blue
<br /> when dry, friable when moist; noncalcareous; very grams, western wheatgrass, and similar grasses grow well
<br /> thin, patchy clay films; clear, smooth boundary. where these soils are used as ranee. Capatility units IIc-1
<br /> B22tb-14 to 23 inches, Clark-gray (10YR 4/1) silty clay loam, (dryland) wind IIe-2 (irrigated) Loam Plains range
<br /> very dark brown (10YR 2/2) when moist; strong, ( ) y 5
<br /> medium, prismatic structure that breaks to strong, site; windbreak suitability,group 1.
<br /> fine, subangular blocky; hard when dry, firm when
<br /> moist; noncalcareous; thick, nearly continuous clay Richfield Series
<br /> films; gradual, smooth boundary.
<br /> 133cab-23 to 26 inches, pale-brown (10YR 6/3) silty clay The Richfield series consists of deep, well-drained
<br /> loam, dark brown (10YR 4/3) when moist; moderate, p> ,
<br /> medium, prismatic structure that breaks to moderate, loamy soils of the uplands. These soils occur mainly in the
<br /> medium, subangular blocky; slightly hard when dry, northeastern part of the county and are nearly level to
<br /> friable when moist; strongly calcareous; visible lime moderately sloping.
<br /> along cleavage lines; about 5 percent of the horizon
<br /> is very dark grayish brown (10YR 3/2) when moist; In a typical profile the surface layer is grayish-brown
<br /> clear, wavy boundary. loam about 6 inches thick. It is easily worked.
<br /> Clea-26 to 43 inches, very pale brown (10YR 8/3) loam, pale The subsoil,about 14 inches thick,is noncalcareous.It is
<br /> brown (10YR 6/3) when moist; moderate, medium, grayish-brown,hard clay loam in the upper part, slightly
<br /> prismatic structure that breaks to moderate, medium,
<br /> subangular blocky; slightly hard when dry, very fri- hard, dark grayish-brown clay loam in the middle part,
<br /> able when moist;very strongly calcareous;lime prom- and slightly hard, light brownish-gray loam in the lower
<br /> inent,but lower part of horizon contains less lime than part.
<br /> upper part; about 2 percent fine gravel; clear, wavy Underlying the subsoil is very pale brown loam or very
<br /> boundary.
<br /> C2-43-to 60 inches, very pale brown (10YR 8/3) silt loam, fine sanely loam that was deposited by wind and then re-
<br /> very pale brown (10YR 7/3) when moist; massive worked locally by wind and water. The underlying mate-
<br /> (structureless) ; hard when dry, friable when moist; rial is very strongly calcareous or strongly calcareous. It
<br /> very strongly calcareous.
<br /> The A horizon ranges from 5 to S inches in thickness,and the Contains much accumulated lime.
<br /> Bet horizon ranges from 10 to 20 inches in thickness. When Itinoff is medium where slopes are nearly level,but it is
<br /> moist the B22tb horizon is black to very dart: brown. Depth rapid where they are gently sloping or moderately sloping.
<br /> to lime ranges from 22 to 38 inches. In some areas a gravel bed The available water holding capacity and natural fertility
<br /> underlies the loess at a depth of 40 inches or more. are High.
<br /> Rago soils are associated with the Kuma-and Richfield soils.
<br /> In contrast to Richfield soils, Rago soils have a black to dark- Most of the acreage of Richfield soils is cultivated.These
<br /> brown layer in the subsoil and are deeper to the limy sub- Soils are suited to winter wheat and sorghums. The native
<br /> stratum. Rago soils have a more clayey 132t horizon than the vegetation consists mostly of western wheatgrass and blue
<br /> Kuma soils.
<br /> Rago and Kuma loans (0 to 3 percent slopes) (Re,) are gnama, but some buffalograss grows in depressional areas
<br /> where more clay has accumulated in the subsoil. Snake-
<br /> in broad areas of the uplands. These soils are so similar weed is a common perennial weed where,the native grasses
<br /> that it is not practical to map them separately.This map- have been overgrazed.
<br /> Al easing lnit is the most generally extend in an southeast sive one idirection and rangn Phillips e Typical profile of Richfield loam, 0 to 3 percent slopes,
<br /> from 40 to 400 acres in size.About 70 percent of the unit is in a cultivated wheatfield (530 feet east,2,540 feet north of
<br /> Rago soil, and 30 percent is Kuma soil,but some fields are the southwest corner of section 23,T.9 N.,R.43 W.) :
<br /> all Rago Soil, and others are all Kuma soil. Ap-0 to 6 inches, grayish-brown (10YR 5/2) loam, very dark
<br /> Included in mapping were small areas of Platner, Rich- grayish brown (10YR 3/2) when moist; weak, fine,
<br /> granular structure; soft when dry, very friable when
<br /> field, and Dawes soils. The Platner soil is in the western moist; noncalcareous; clear, smooth boundary.
<br /> part of the county,the Riclifield soil is in the eastern part, B1-6 to 10 inches, grayish-brown (loYR 5/2) clay loam, very
<br /> and the Dawes soil is in both the central and western parts. dark grayish brown (10YR 3/2) when moist; weak,
<br /> coarse,prismatic structure that breaks to weak,coarse,
<br /> Also included were areas of a soil that is similar to Rago subangular blocky; hard when dry, firm when moist;
<br /> loan, except that gravelly material is at a depth of about very thin,patchy clay films on vertical and horizontal
<br /> 24 inches. Many small intermittent lakes or potholes are faces of peds;noncalcareous; clear,smooth boundary.
<br /> Mt-10 to 15 inches, dark grayish-brown (10YR 4/2)
<br /> clay
<br /> within mapped areas and are shown on the soil map by a loam, very dark grayish brown (10YR 3/2) when
<br /> symbol. moist; moderate, medium, prismatic structure that
<br /> Rago and Kuma loams absorb water at a moderate to breaks to moderate, medium and fine, subangular
<br /> slow rate, and runoff causes erosion duringblocky; slightly hard when dry, firm when moist;
<br /> some storms. thick, continuous clay films on vertical and horizontal
<br /> These'soils have high available moisture capacity. faces of peds;noncalcareous;clear,smooth boundary.
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