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ADAMS COUNTY, COLORADO
<br />Vona Series
<br />The Vona series is made up of well-drained, nearly
<br />level to moderately sloping soils on uplands. These soils
<br />formed in wind-deposited sandy material.
<br />In a representative profile, the surface layer is light
<br />brownish-gray loamy sand about 9 inches thick. It is
<br />noncalcareous. The subsoil is pale-brown coarse sandy
<br />loam about 13 inches thick. It is noncalcareous. The
<br />underlying material is light yellowish-brown sandy loam
<br />and very pale brown, highly calcareous loamy sand that
<br />contains lime visible as splotches.
<br />Vona soils absorb water rapidly, and the available
<br />water capacity is moderate. Permeability is rapid, and
<br />the entire soil is suitable for plant roots.
<br />Representative profile of Vona loamy sand, 3 to 9
<br />percent slopes, in a cultivated field, 350 feet west and
<br />150 feet north of the southeast corner of section 14, T.
<br />2 S., R. 65 W.:
<br />Ap-0 to 0 inches, light brownish-gray (lOYR 6/2) loamy
<br />sand, dark grayish brown ~ (lOYR 4/2) when moist;
<br />very weak, coarse, blocky structure parting to weak,
<br />fine, granular structure; slightly hard, very friable;
<br />noncalcareous; neutral; abrupt, smooth boundary.
<br />B2t-9 to 22 inches, pale-brow¢ (IOYR 613) coarse sandy
<br />loam, dark brown (lOYR 4/3) when moist; weak,
<br />coarse, prismatic structure parting to weak, medium,
<br />subangular blocky structure; hard, friable; patchy
<br />clay films ou faces of peds; noncalcareous; neutral;
<br />clear, smooth boundary.
<br />Clca-22 to 27 inches, light yellowish-brown ~(lOYR 6/4)
<br />sandy loam, dark yellowish brown (lOYR 4/4) when
<br />moist; massive; hard, friable; calcareous and co¢-
<br />tains afew splotches of time in places; moderately
<br />alkaline; cleaq wavy boundary.
<br />C2ca-27 to 40 inches, very pale brown (lOFR 7/3) coarse
<br />sandy loam, pale brown (lOYR 6/3) wben moist;
<br />massive; hard, friable; calcareous and contains lime
<br />disseminated and in splotches; moderately alkaline;
<br />cleaq wavy boundary.
<br />C3ca-40 to 60 inches, very pale brown (lOFR 7/3) loamy
<br />sand, brown (lOYR 5/3) when moist; massive; very
<br />friable; calcareous and contains from weak to strong
<br />visible Lime; moderately alkaline.
<br />The A horizon ranges from 5 to 10 inches in thickness,
<br />from grayish brown to very pale brown in color, and from
<br />sandy loam to loamy sand in texture. The B horizon ranges
<br />from 6 to 20 inches in thickness and from grayish brown to
<br />light yellowish brown in color. Depth to calcareous material
<br />ranges from 11 to 30 inches.
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<br />and the hazard of soil blowing is severe. Included in
<br />mapping are small areas of Valent loamy sand.
<br />Much of this soil is or has been cultivated. Many
<br />small areas remain in native grass. Many old fields have
<br />been seeded to grass and are now used for grazing. This
<br />soil is not suitable for cultivation because. of the hazard
<br />of erosion. Capability unit VIe11, nonirrigated; Sandy
<br />Plains range site; tree planting suitability group 2.
<br />Vona sandy loam, 0 to 1 percent slopes (VoA).-This
<br />soil is on river terraces. The areas are irregularin shape
<br />and range from 200 to 250 acres in size. Runoff is slow,
<br />and the hazards of water erosion and soil blowing are
<br />only slight.
<br />Thts soil has a profile similar to the one described as
<br />representative for the series, but it has a sandy loam
<br />surface layer and a thicker surface layer acid subsoil.
<br />Included in mapping are small areas of Dacono loam
<br />near the terrace ed~aes.
<br />All of this-soil is cultivated and irrigated. It is an
<br />important soil because truck farming is highly developed
<br />in this area (fig. 13). Capability unit Its-2, irrigated;
<br />not placed in a range site; tree planting suitability
<br />group 2.
<br />Vona sandy loam, 1 to 3 percent slopes IVoBI.-This
<br />soil has a profile similar to that described as representa-
<br />tive for the series, but it has a sandy loam surface layer.
<br />The areas are extremely irregular in shape and range
<br />from 30 to 200 acres in size. The hazards of water ero-
<br />sion and soil blowing are moderate. Included in map-
<br />ping, on small ridges and mounds on uplands, are small
<br />areas of Vona loamy sand. Also included, in irrigated
<br />areas, are some small areas of Dacono loam near terrace
<br />edges.
<br />Much of this soil is or has been cultivated. Some
<br />formerly irrigated areas have been or are being developed
<br />for industry and housing. In general, this soil is suitable
<br />for housing projects and has few limitations for con-
<br />struction. It is well suited to most irrigated and dry-
<br />farmed crops, but it is not so suitable for truck farming
<br />as the nearly level Vona sandy loam. It is an excellent
<br />soil for native grass. Capability unit IIIe~I, irrigated,
<br />and IVe-5, nonirrigated; Sandy Plains range site; tree
<br />planting suitability group 2.
<br />Vona loamy sand, 0 to 3 percent slopes (Vn8).-This
<br />soil is on uplands, in areas that are irregular iu shape
<br />and range from 30 to 200 acres in size. Surface runoff
<br />is moderate to slow, and the hazard of water erosion is
<br />slight. The hazard of soil blowing is moderate to severe.
<br />This soil has a profile similar to .the one described
<br />as representative for the series, but the surface layer
<br />and subsoil are thicker.
<br />Most areas of this soil are cultivated. Some small,
<br />scattered areas have a cover of native grass. Some areas
<br />are irrigated. Capability unit IIIe-5, irrigated, and IVe-
<br />8, nonirrigated; Sandy Plains range site; tree planting
<br />suitability group 2.
<br />Vona loamy sand, 3 to 9 percent slopes IVnD).-This
<br />soil has the profile described as representative for the
<br />series. The areas are irregular in shape and range
<br />from 20 to 250 acres in size. Surface runoff is medium,
<br />Figure f3. Head lettuce growing on irrigated Vona soils.
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