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<br />.4-; .. ~.-- -...i
<br />HOtILDER COWTY AREA, COLORADO
<br />that have scattered gravel and cobbles on the surface.
<br />These included soils make up about `?0 percent of each
<br />mappped area.
<br />Runoff is medimn on this soil. Permeability is slow.
<br />The erosion hazard is moderate.
<br />\Zost of the acreage of this soil is used for irrigated
<br />crops and pasture. and the rest is used for dryland crops.
<br />a few very small areas arc used for range. (Capability
<br />units IIrl, irritated, and IIIs-1. nonirrigated; tree
<br />suitability grnnp 3)
<br />Nunn clay loam, 3 to 5 percent slopes {NuCI.-This
<br />soil is in the central part of the Area. In most places
<br />it occurs as areas more than RO acres in size. In a few
<br />places this soil has scattered gravel and cobblestones on
<br />the surface.
<br />The profile of this soil is much like the one described
<br />ns representative for the, series. but the subsoil is about
<br />1? inches of clay. Lime is at a depth of about 16 inches.
<br />Incl«ded with this soil in mapping are a few areas of
<br />a Nunn-like soil that has shale between depths of 10 and
<br />60 inches. also included are a few small areas of Iiim
<br />soils and small areas of ?loan clay loam, 1 to 3 percent
<br />slopes. These included soils make up about 15 percent
<br />of each mapped area.
<br />Runoff is medium on this soil. The permeability of
<br />the subsoil is slow. The erosion hazard is moderate.
<br />Most of the acreage of this soil is used for irrigated
<br />and chylnnd crops and for pasture. Some areas near
<br />Longmont are bein, converted to «rBan uses. (Capability
<br />units IIIe-?, irrigated, and ITIe-i, nonirrigated; tree
<br />suitability group :3)
<br />Nunn clay loam, 3' to 9 percent slopes (NuDI.-This
<br />soil is in the central part of the Area. Most. areas are
<br />more than 30 acres in size and are irrelmlarly shaped. In
<br />a few small places this sail has gravel and cobblestones
<br />on the surface.
<br />The profile of this soil is mach like the one described
<br />as representative for `he series. but the surface layer
<br />is about 3 inches of clay loam. The subsoil is about 6
<br />inches of noncalcareous-clay underlain with about °_4
<br />inches of calcareous clay loam.
<br />Included with this -soil in mapping are some areas
<br />of a Nnnn-like soil that has shale or sandstone betReen
<br />depths of IO to 60 inches.:\Iso included are small areas
<br />of rim soils; small areas of ?loon clay loam, 3 to 5 per-
<br />cent slopes: and a few small areas of retch clap loam,
<br />3 to 0 percent slopes. These included soils make up
<br />about 15 percent of each mapped area.
<br />Rnnolf is rapid on this soil. The permeability of the
<br />sub,nil is slow. The. erosion hazard is high.
<br />Must of the acreage of this soil Is used for irrigated
<br />and drvlancl crops noel for pasture. (Capability units
<br />IVe-1, irrigated, and VIe-1, nonirrigated; tree stlitabil-
<br />itv troop 31
<br />Nunn-Kim complex (0 to 3 percent slopes) (Nvl.-
<br />This c~~mplex is in the eastern part of the Area. This
<br />complex consists of about 50 percent Nunn soils and
<br />about •',.~ nerocnt Iiim soils. Nunn soils are on the smooth-
<br />er parts 1` the complex. Kim soils are on the less smooth
<br />parts, or 'hey are inhere extensive land leveling has been
<br />performer..
<br />Nunn s~~ls bare a profile much like the one described
<br />as repress' ,arise for the, series, but in some places the
<br />surface Inn is a sanch clan loam.
<br />21
<br />Iiim soils have a profile much like that described as
<br />representative for the series. but in tome places the sur-
<br />face layer is a sandy clay loam.
<br />Included n•ith this complex in mapping are areas of a
<br />soil havir.¢ a surface lati-er that is thicker or thinner
<br />as a result of leveline• :\lso included are small met areas
<br />that pace a Rater table between depcls of •', and 5 feet.
<br />These included soils amount to about 15 percent of each
<br />mapped area.
<br />Runoff is medium on this complex. The erosion hazard
<br />is moderate.
<br />This complex is used for irrigated crops and pasture-
<br />(Capability unit IIe-1, irrigated; tree suitability group
<br />3)
<br />Otero Series
<br />The Otero series is made up of deep. ReU-drained soils.
<br />These soils formed on terraces. rollin,; itplancls, and val-
<br />ley side slopes in loam}- allutium and •vind-laid materials.
<br />Slopes are 0 to ?0 percent. Elevation:; are x.300 to 5;500
<br />feet. The native ve_etation is mainlc mid and tall grasses.
<br />annual precipitation is 14 to 1S in.hes. Mean annual
<br />air temperature is -1S° to 53° F.. and Ere frost-free season
<br />is about 1 }0 to 15a- days.
<br />In a representative profile the s«n.`ace la}-er. about 6
<br />inches thick, is strongly calcareous- bromtt sandy loam.
<br />Below this is pale-brown sands loam abort 6- inches
<br />thick. The underlying material- is srron_I} calcareous,
<br />light yellowish-brown sanch• loam that ertends to a
<br />depth of 6(1 inches or more. The upper part of the under-
<br />lying material cmttains some soft lime segregations. Soil
<br />reaction is moderately alkaline.
<br />Otero sails have nioderatelp rapid pernteability. avail-
<br />able mater capacity for the profile i~ moderate. Roots
<br />can penetrate to a depth of 60 inches or more.
<br />These soils arc used for irrigated and dryland crops
<br />and for pasture.
<br />Representative profile of Otero sand: loam in -\scalon-
<br />Otero cmmplex. 9 to ?0 percent slopes, located 1.:,00 feet
<br />west and :i50 feet north of the southeast corner of sec.
<br />3, T. 1 N., R. 69 ';~ .
<br />Ap-0 to 8 inches. brown (lOYR 5/3) sandy loam, brown
<br />(lOYR 413) when moist; weal;, doe. crumb stric-
<br />ture; soft, very triable; stront3y calcareous; rood~
<br />erately alkaline: clear. smooth boundary.
<br />Af:--B to 1^ inches. pale-brown f10Ylt 8/31 sandy, lostn.
<br />brown (lOYR -F(3) when moist: weak. medipm, sub-
<br />angvlar blxl:y structure; slightly hard. very Yrinble;
<br />strongly calcareous with few, 9ne and medium, prom-
<br />inent, white (lOFR 8/^), sots lime segregations:
<br />moderately alkaline: clear, smooth boundary.
<br />Cl-1^ to 36 inches, light yellowish-brown (lOYR R/-1) sandy
<br />loam, yellowish brown (lOYR 5/-F) when moist;
<br />weak. medium. subnngular blocky structure; bald.
<br />very friable: strnngly calcareous; moderntely alka-
<br />line; clear, smooth boundary.
<br />C4-38 to RO inches, light yellowish-brown (lOYA 8/i) sandy
<br />loam. yenowish brown (lOYR 5/d1 when moist;
<br />massive: hard, very friable; :3rongly calrnreous:
<br />moderntely atkattne.
<br />The A horizon ranges from R to 14 inr~.es in thiclmess. The
<br />structure ranges Lrom granular or crumb [o weak sabangtilar
<br />blxky. In most places the C horizon is sandy loam or Bne
<br />sandy loam. Depth to bedrock is more than 80 inrLes, bat
<br />In some maces it is between depths of }0 and 80 Inches.
<br />These voila are calcareous throughout the pcodle. although the
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