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PHILLIPS COUNTY, COLORADO 19 Al}-0 to 5 inches, grayish-brown (10YR 5/2) loam, very Clark Almost all the acreage is cultivated. The soils in this grayverynsh rown thic�k, platy structure tt re that breaks to 3/2) when moist; weak,weak,1 thin to fine group are well suited to winter wheat, barley, sorghums, granular; hard when dry, friable when moist; non- and corn that are clryfarmed. They also are suited to many calcareous; abrupt, smooth boundary, kinds of irrigated crops. In clryfarmed fields,the practice P1-5 to 9 inches,stark grayish-brown (10YR 4/2) loam, very of following small grain or sorghum with summer fallow dark grayish brown (10YR 3/2) when moist; moder- helps in maintaining soil moisture and fertility. ate, coarse, subangular blocky structure that breaks mo erty. Stubble to moderate, medium, subangular; slightly hard when mulching and working crop residue into the soil are prac- dry, firm when moist; noncalcareous; about 2 percent tices needed for controlling erosion. fine gravel; clear, smooth boundary. In irrigated fields the soils can be leveled so that the B21t-9 to 14 inches, dark grayish-brown( (10YR 4/2) clay water spreads uniformly. The crops respond well if fer- loam, very dark grayish brown 10YR 3/2) when moist; moderate, medium, prismatic structure that tilizer is added. Working crop residue into the soil helps breaks to moderate, fine, subangular blocky; hard to control erosion and to maintain fertility and tilth. Blue when dry, friable when moist; noncalcareous; very grama, western wheatgrass, and similar grasses grow well thin patchy clay films; clear, smooth boundary. B22tb-14 to 23 inches, dark-gray (10YR 4/1) silty clay loam, where these Band Soils are (irrigated)gated) ;ed as range. CLomy tPla his range very dark brown (10YR 2/2) when moist; strong, ) medium, prismatic structure that breaks to strong, Site; -windbreak suitability group 1. fine, subangular blocky; hard when dry, firm when moist; noncalcareous; thick, nearly continuous clay Richfield Series films; gradual, smooth boundary. Mcab-23 to 26 inches, pale-brown (10YR 6/3) silty clay loam, dark brown (10YR 4/3) when moist; moderate, The Richfield series consists of deep, -well-drained, medium, prismatic structure.that breaks to moderate, loamy soils of the uplands. These soils occur mainly in the medium, subangular blocky; slightly hard when dry, northeastern part of the county and are nearly level to friable when moiA; strongly calcareous• visible lime moderately Sloping. along cleavage lines; about 5 percent of the horizon is very dark grayish brown (10YR 3/2) when moist• In a typical profile the surface layer is grayish-brown clear, wavy boundary. loam about 6 inches thick.It is easily worked. Clca-26 to 43 inches, very pale brown (10YR 8/3) loam, pale The subsoil,about 14 inches thick,is noncalcareous.It is brown (10YR 6/3) when moist• moderate, medium, grayish-brown, hard clay loam in the upper part, slightly prismatic structure that breaks to moderate, medium, subangular blocky; slightly hard when dry, very fri- luard, Clark grayish-brown clay loam in the middle part, able when moist;very strongly calcareous; lime prom- and slightly hard, light brownish-gray loam in the lower inent,but lower part of horizon contains less lime than part, upper boundary,t; about 2 percent fine gravel; clear, wavy Underlying the subsoil is very pale brown loam or very C12-43 to 00 inches, very pale brown (10YR 8/3) silt loam, fine sandy loam that was deposited by wind and then re- very pale brown (10YR 7/3) when moist; massive worked locally by wind and water. The underlying mate- (structureless) ; hard when dry, friable when moist; rial is very strongly calcareous or strongly calcareous. It very strongly calcareous. y by The A horizon ranges from 5 to 8 inches in thickness,and the contains much accumulated lime. L'2t horizon ranges from 10 to 20 inches in thickness. when Runoff is medium where slopes are nearly level,but it is moist the B22tb horizon is black to very dark brown. Depth rapid where they are gently sloping or moderately sloping. to lime ranges from 22 to 38 inches.In some areas a gravel bed The available water holding capacity and natural fertility underlies the loess at a depth of 40 inches or more. Rago soils are associated with the Kuma and Richfield soils. are high. In contrast to Richfield soils, Rago soils have a black to dark- Most of the acreage of Richfield soils is cultivated. These brown layer in the subsoil and are deeper to the limy sub- soils are suited to winter wheat and sorghums. The native stratum. Rago soils have a more clayey 132t horizon than the Kuma soils. vegetation consists mostly of western wheatgrass and blue Rago and Kuma loams (0 to 3 percent slopes) (Ra) are grain,, but some buff alograss grows in depressional areas in broach areas of the uplands. These soils are so similar -where more clay has accumulated in the subsoil. Snake- that it is not practical to map them separately. This map- weed is a common perennial weed where the native grasses ping unit is the most extensive one in Phillips County. have been overgrazed. Areas generally extend in a southeast direction and range Typical profile of Richfield loam, 0 to 3 percent slopes, from 40 to 400 acres in size.About 70 percent of the unit is in It cultivated wheatfield (530 feet east,2,540 feet north of Rago soil, and 30 percent is Kuma soil,but some fields are the southwest corner of section 23,T.9 N.,R.43 W.) all Rago soil, and others are a.11 Kuma, soil. Ap-0 to 6 inches, grayish-brown (10YR 5/2) loam, very dark Included in mapping were small areas of Pla.tner, Rich- grayish brown (10YR 3/2) when moist; weak, fine, field, and Dawes soils. The Platuer soil is in the western granular structure; soft when dry, very friable when part of the county,the Richfield soil is in the eastern part moist; noncalcareous; clear, smooth boundary. Bl-6 to 10 inches, grayish-brown (10YR 5/2) clay loam, very and the Dawes soil is in both the central and western parts, dark grayish brown (10YR 3/2) when moist; weak, Also included were areas Of a soil that is shililar to Rago coarse,prismatic structure that breaks to weak,coarse, loam, except that gr,velly material is at a depth of about subangular blocky; hard when dry, firm when moist; 1� very thin,patchy clay films on vertical and horizontal 24 inches. Many small intermittent lakes or potholes are faces of peds;noncalcareous; clear, smooth boundary. within mapped areas and are shown On the soil map by a 112t-10 to 15 inches, dark grayish-brown (10YR 4/2) clay symbol. loam, very dark grayish brown (10YR 3/2) when moist; moderate, medium, prismatic structure that Rago and Kunio looms absorb water at a moderate to breaks to moderate, medium and fine, subangular slow rate, and runoff causes erosion during some storms. blocky; slightly hard when dry, firm when moist These soils have high available moisture ca acit thick,continuous clay films on vertical and horizontal P y faces of peds; noncalcareous;clear,smooth boundary.