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Extlit B. - Site Deacrlption •
<br />LARIMER COUNTY AREA, COLORADO
<br />dryland management it is suited to pastw•e and native
<br />grasses. Capability units IIIe-2, Irrigated, and IVe-3,
<br />dryland; Loamy Plains range site; windbreak suit-
<br />ability gI•oup 1.
<br />55-Kim loam, :. to 9 percent elol~ce. Tltis sttongly
<br />sloping soil is on uplands and fans. This soil has the
<br />profile described as representative of the series.
<br />Included with this soil in mapping are small areas of
<br />soils that have a surface layer and subsoil of clay loam
<br />or silt loam and a few small areas of soils that have
<br />gravel on the surface. Also included are minor areas of
<br />Stoneham and Thedalund soils.
<br />Rmloff is rapid, soil the hazard of erosiml is severe.
<br />If irrigated, this soil is well suited to pasture and, to
<br />a lesser extent, barley, alfalfa, and wheat. Uudet• dry-
<br />land management it is suited to pasture and native
<br />grasses. Capability units IVe-1, irrigated, and Vle-1,
<br />dryland; Loamy I'.laius range site; windbreak suit-
<br />ability group I.
<br />56-Kim-171edaluud lomne, 3 to 15 percent elopes.
<br />This complex consists of gently sloping to moderately
<br />steep soils on uplands, fans, and valleysides. 1t is about
<br />45 percent I{im loam and about 35 percent Thedalund
<br />loam. Kim loam is smoother and less sloping, and
<br />Thedalund loam is steeper. These soils have profiles
<br />similar to the ones described as representative of their
<br />respective series, but the surface layer is about 4 or 5
<br />inches thick.
<br />Inc]uded with the:>e soils in mapping are a few small
<br />areas of Renohill and Midway soils, a few small out-
<br />crops and gravel knobs, and some small seep spots.
<br />Runoff is rapid, and the hazard of erosion is severe.
<br />These soils are mainly used for pasture and native
<br />grasses. Capability unit VIe-1, dryland; Loamy Pluius
<br />range site; wirrdbrer.k suitability group 1.
<br />Kirllcy Sct•ics
<br />The Kirtley series consists of moderately deep, well
<br />drained soils that formed in material weathered Loin
<br />reddish brown sandstone and shale. These soils are on
<br />uplands and side slopes and are underlain by soft shale
<br />at a depth of 20 to 40 inches. ];levation ranges from
<br />5,600 to G,400 feet. Slopes are 3 to 1'5 percent. The
<br />native vegetation is mainly blue grams, side-oats
<br />grams, western wheatgrass, yucca, and rabbitbrush.
<br />btean amlual precipitation ranges from 15 to 18
<br />inches, mean annual air temperature ranges from 47°
<br />to 50° F, and the frost-free season ranges fI•mn 115
<br />to 130 days.
<br />In a representative profile the surface layer is red-
<br />dish brown loam about 4 inches thick. The subsoil is
<br />reddish brown heavy loam about 14 inches thiclt. Be-
<br />low this is light reddish brown loam about 8 inches
<br />thick that is underlain by soft sandstone and shale.
<br />Permeability is moderate, and the available water
<br />capacity is medium. reaction is mildly alkaline.
<br />These soils are used mainly for native grasses.
<br />Representative profile of Kirtley loam in an area of
<br />Kirtley-Pm•ner complex, 5 to 20 percent slopes, in
<br />native grass, 70 feet south of access road in sec. 14,
<br />T. 10 N., R. 70 W.:
<br />Al-0 to 4 incllcs; reddish brown (~iYR 5j3)
<br />loam, dark reddish brown (uYlt 3/3)
<br />p~ge2
<br />33
<br />moist; moderate fine granular struc-
<br />ture; slightly hard, friable; mildly alka-
<br />line; abrupt smooth boundary.
<br />B21t-4`to 11 inches; reddish brawn (2.5YR 4/3)
<br />heavy loam, dark reddis}I brown (2.5YR
<br />3/3) moist; moderate very fine subangll-
<br />]ar blocky structure; hard, friable; thin
<br />nearly continuous clay films; mildly al-
<br />kaline; clear smooth boundary.
<br />B22~11 to 18 inches; reddish brown (2.5YR
<br />5/4) heavy loam, daI•k reddish brown
<br />(5YR 3/4) moist; moderate fine pI•is-
<br />matic structm•e parting to moderate me-
<br />dium subangular blocky; hard, friable;
<br />thin nearly continuous clay fibns;
<br />mildly alkaline; clear smooth boundary.
<br />Clca-18 to 26 inches; light reddish brown
<br />(2.5YR 6/4) loam, reddish brown
<br />(2.5YI2 4/4) moist; massive; Ilat•d, fri-
<br />able; visible calcium carbonate as seams
<br />:uid streaks; strongly e(Iervescent; 25
<br />percent weathered red sandstone chan-
<br />ners; moderately alkaline; abrupt
<br />smooth boundary.
<br />C2r-26 to GO inches; red sandstone.
<br />Thickness of the mottle epipedon ranges from 7 to
<br />15 inches. The A horizon is loam or fine sanely loam
<br />3 to 6 inches thick. TIIe B horizon is loam oI• light clay
<br />loam 9 to 20 inches thick. 1'he A and B horizons t•ange
<br />from neutral to mildly alkaline. Content of rock fI•ag-
<br />ments ranges from 0 to 15 percent in the A and B
<br />horizons.
<br />57:_j{jrtlcv lonuy,'~p2y~I•~~elnnce• This gently
<br />sloping or strong y slopm_g ssol Is on uplands and
<br />valleysides. This soil has a profile similar to the one
<br />described as representative of the series, but the com-
<br />bined thickness of the surface layer and subsoil is
<br />about 20 iuclles and depth to sandstone is about 30
<br />inches.
<br />Included r5'Ith this soil in mapping are some small
<br />areas of outcrops and some small areas of soils in
<br />which sandstone fragments are in the profile. Also
<br />included are small areas of soils that ahe more sloping
<br />or less sloping and small areas of Harlan and Purllet•
<br />soils.
<br />Runoff is medium to rapid, and the hazard of ero-
<br />sion is severe.
<br />This soil is well suited to pastul•e and native grasses
<br />under dryland management. It is less well suited to
<br />wheat and baI•ley. If irrigated, it is suited to barley,
<br />wheat, and alfalfa. It is also suited to pasture. Capa-
<br />bility units IVe-1, irrigated, and IVe-3, dryland;
<br />Loamy Footllili range site; not assigned to a wind-
<br />break suitability group.
<br />53-Kirllcy-Purner complex, S to 20 percent elopes.
<br />This complex consists of strongly sloping to moder-
<br />ately steep soils on uplands and valleysides. It is about
<br />45 percent I(irtley loam and about 40 percent Purner
<br />fine sandy loam. Kirtley loam is smoother and less
<br />sloping, and Purser soil is steeper. The Kirtley soil
<br />has the profile described as representative of the Kirt-
<br />ley series. The Purner soil has a profile similar to the
<br />one described as representative of the Purner series.
<br />Included with these soils in mapping are same small
<br />
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