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0 WELD COUNTY, COLORADO, SOUTHERN P* 7
<br /> brief description of the soil profile. In each description, The acreage and proportionate extent of each map unit
<br /> the principal hazards and limitations are indicated, and are given in table 4,and additional infartnation on proper-
<br /> the management concerns and practices needed are ties, limitations, capabilities, and potentials for many soil
<br /> discussed. uses is given for each kind of soil in other tables in this
<br /> The map units on the detailed soil maps represent an su"ey. (See "Summary of tables.") Many of the terms
<br /> ama.on the landscape made up mostly of the soil or soils used in describing soils are defined in the Glossary.
<br /> for which the unit is named, Most of the delineations
<br /> shown on the detailed soil map are phases of soil series. Soil descriptions
<br /> Soils that have a profile that is almost alike make up a
<br /> soil series. Except for allowable differences in texture of I—Altvan loam, 0 to I percent slopes. This is a deep,
<br /> the surface layer or of the underlying substratum,all the well dmined Soil on ter-races at elevations of 4,5W to 4,9W
<br /> soils of a series have major horizons that are similar� in fect. It firmed in old alluvium deposited by the major
<br /> composition, thickness, and arrangement in the pmfile. A riven. Included in mapping are small amas of soils that
<br /> soil series commonly is named for a town or geographic show evidence of poor di-ainage. Also included are small,
<br /> feature near the place where a soil of that series was long and namow areas of Hand and gravel deposits.
<br /> fint obge"ed and mapped. Olney and Nunn, for example, Typically the surface layer of the Altvan soil is grayish
<br /> are names of two soil series. brown loam about 10 inches thick. The subsoil is brown
<br /> Soils of one series can differ in texture of the Surface and light yellowish brown clay loam and sandy clay loam
<br /> layer or in the underlying subsinturn and in slope, em- about 15 inches thick.The substmturn is calcareous loamy
<br /> sion, stoniness, salinity, wetness, or other characteristics sand about 6 inches thick over gravelly sand.
<br /> that affect their use. On the basis of such differences, a Permeability and available water capacity are
<br /> Soil series is divided into phases.The name of a soil phase moder-ate. The effective rooting depth is 20 to 40 inches.
<br /> commonly indicates a feature that affects use or manage- Surface runoff is slow,and the erosion hau, is low.
<br /> ment. For example, Olney fine Sandy loam, I to 3 pement This soil is used almosit entirely for irrigated crops. It
<br /> slopes,is one of several phases within the Olney series. is suited to all cirops commonly grown in the area, includ-
<br /> Some map units are made up of two or mom dominant ing com' sugar beets, beans, alfalfa, small grain, potatoes,
<br /> kinds of soil.Such map units are called soil complexes and and onions. An example of a Suitable cropping system is 3
<br /> undiffemntiated groups, to 4 yeam of alfalfa followed by com, com for silage,
<br /> A soil compiex consists of areas of two or more Soils sugar� beets, small grain, or beans. The high clay content
<br /> that are so intricately mixed or so Small in size that they and the rapidly permeable substmtum slightly restrict
<br /> cannot be Shown sepamlely on the soil map. Each ama in- some cr-ops.
<br /> cludes Home of each of the two or mom dominant soils, All methods of irrigation are suitable, but furrow ir-
<br /> and the pattem and proportion are somewhat similar in rigation is the most common (fig. 4). Pmper irrigation
<br /> all area& MidW2y-Shingle complex,6 to 20 percent slopes,
<br /> is an example. water management is essential. Bamyard marium and
<br /> An undiffmntiated group is made up of two or more commercial fertilizer am needed for top yields.
<br /> soils that could be mapped individually but are mapped as Windbmaks and environmental plantings of trees and
<br /> one unit because there is little value in separating them. alimba commonly growri in the area am generally well
<br /> The pattern and limportion of the soils are not uniform. suited to this Soil. Cultivation to control competing
<br /> An area shown on the map has at least one of the domi- vegetation should be continued for as many years as
<br /> nant (named) soils or may have all of th Loup-Bol possible following planting.Trees that am beat suited and
<br /> emiferentiate
<br /> loamy Hands, 0 to 3 percent slopes, is an undi d have good sui-vival am Rocky Mountain juniper, eastern
<br /> group in this survey area. redeedar, ponderosa pine,Siberian elm, Russian-olive,and
<br /> Most map units include small, scattered areas of soils hackberry. The shmbs beat suited are skunkbush sumac,
<br /> other than those that appear in the name of the map unit. lilac,Siberian peashrub,and American plum.
<br /> Some of these soils have jimperties that differ substan- This soil can produce habitat elements that are highly
<br /> tially from those of the dominant soil or soils and thus suitable for openland wildlife, including pheasant, cotton-
<br /> could significantly affect use and management of the map tail, and mourning dove. Such crops as wheat� com, and
<br /> unit. These soils are described in the description of each alfalfa provide suitable habitat for openland wildlife,
<br /> map unit. Some of the mom unusual or strongly contnt- especially pheasant. Tree and shmb plantings and
<br /> ing soils that am included are identified by a special sym- undisturbed nesting cover would enhance openland wil-
<br /> bol on the soil map. dlife populations.
<br /> Most mapped areas include places that have little or no This Altvan soil has fair to good potential for urban
<br /> soil material and support little or no vegetation. Such and recreational development. The chief limiting soil fea-
<br /> places 2re called miscellaneous areas; they am delineated tums for urban development are the shrink-swell poten-
<br /> on the soil map and given descriptive names. Rock out- tial of the subsoil as it wets and dries arid the rapid
<br /> crop is an example. Some of these areas are too Small to pemeability of the sarrid and gmvel subsbratum. Septic
<br /> be delineated and are identified by a special symbol on tank absorption fields function limperly, but in places the
<br /> the soil map. substratum does not contain enough fines to properly
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