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~• EXHIBIT "AA"
<br />34 • SOIL SURVEY
<br />or drilled into firm, clean sorghums bble. Seeding
<br />early in spri has proven most s cessful. Brush
<br />management n also help to improved eriorated range.
<br />Windbrea and environmental plan gs are fairly well
<br />suited tot s soil. Blowing sand an ow available water
<br />capacity a the principal hazards in establishing trees
<br />and sh s. This soil is so loos that trees should be
<br />planted in shallow furrows, a vegetation is neede
<br />betwe n the rows. Supplement irrigation may be nee d
<br />to i ore survival. Trees tha aze best suited and ve
<br />goo survival are Rocky ountain juniper, a tern
<br />r cedar, ponderosa pine, d Siberian elm. The rubs
<br />st suited are skunkb h sumac, lilac, and Iberian
<br />peashrub.
<br />Wildlife is an import t secondary use of th' soil. The
<br />cropland areas provid favorable habitat for 'ng-necked
<br />pheasant and mourn' g dove. Many nonga species can
<br />be attracted by es bushing areas for nest' g and escape
<br />cover. For pheas ts, undisturbed nestin cover is essen-
<br />tial and should a included in plans for habitat develop-
<br />ment, especiall in areas of intensive griculture. Range-
<br />land wildlife, or example, the prong rn antelope, can b
<br />attracted b developing livestoc watering faciliti s,
<br />managing estock grazing, and re eding where need d.
<br />Few a as of this soil are in major growth an ur-
<br />banized enters. The chief lima ng feature is th rapid
<br />perme ility in the substrata , whicrh causes a h azd of
<br />grou water contamination rom seepage. Pot olio] for
<br />rec ation is poor because of the sandy su ace layer.
<br />C ability subclass IVe i gated, VIe non' sled; Deep
<br />nd range site.
<br />-~~50,-Otero sandy loam, 0 to 1 percent slopes. This is a
<br />deep, well drained soil on smooth plains at elevations of
<br />9,700 to 5,250 feet. It formed in mixed outwash and eolian
<br />deposits. Included in mapping are small areas of soils that
<br />have loam and clay loam underlying material.
<br />Typically the surface layer is brown sandy loam about
<br />12 inches thick. The underlying material to a depth of 60
<br />inches is pale brown calcareous fine sandy loam.
<br />Permeability is rapid. Available water capacity is
<br />moderate. The effective rooting depth is 60 inches or
<br />more. Surface runoff is slow, and the erosion hazard is
<br />]ow.
<br />This soil is used almost entirely for irrigated crops. It
<br />is suited to all crops commonly grown in the area, includ-
<br />ing corn, sugar beets, beans, alfalfa, small grain, potatoes,
<br />and onions. An example of a suitable cropping system is 3
<br />to 4 years of alfalfa followed by corn, corn for silage,
<br />sugar beets, small grain, or beans. Generally, such charac-
<br />teristics as a high clay content or a rapidly permeable
<br />substratum slightly restrict some crops.
<br />All methods of irrigation are suitable, but furrow ir-
<br />rigation is the most common. Proper irrigation water
<br />management is essential. Barnyard manure and commer-
<br />cial fertilizer are needed for tap yields.
<br />Windbreaks and environmental plantings are generally
<br />suited to this soil. Soil blowing, the principal hazard in
<br />establishing trees and shrubs, can be controlled by cul-
<br />rivaling only in the tree row anrj by leaving a strip of
<br />vegetation between the rows. S~rpplemental irrigation
<br />may be needed at the time of pllanting and during dry
<br />periods. Trees that are best suited and have good survival
<br />are Rocky Mountain juniper, eastern redcedaz, ponderosa
<br />pine, Siberian elm, Russian-olives and hackberry, The
<br />shrubs best suited are skunkbush sumac, lilac, and Siberi-
<br />an peashrub.
<br />Wildlife is an important secondary use of this soil.
<br />Ring-necked pheasant, mourning dove, and many non-
<br />game species can be attracted by'establishing areas for
<br />nesting and escape cover. For heasants, undisturbed
<br />nesting cover is essential and shoo d be included in plans
<br />for habitat development, especiall in areas of intensive
<br />agriculture.
<br />Rapid expansion of Greeley and:, the surrounding area
<br />has resulted in urbanization of much of this Otero soil.
<br />This soil has excellent potential f!or urban and recrea-
<br />tional development. The only ]iraiting feature is the
<br />moderately rapid permeability in ~he substratum, which
<br />causes a hazard of ground water contamination from
<br />sewage lagoons. Lawns, shrubs, And trees grow well.
<br />Capability subclass Its irrigated.
<br />51-Oter sandy loam, 1 to 3 percent lopes. This is a
<br />deep, well rained soil on plains atiele lions of 4,700 to
<br />5,250 fe It formed in mixed ~~ o wash and eolian
<br />deposits Included in mapping are s 1 areas of sails that
<br />have 1 m and clay loam underlying aterial.
<br />Ty tally the surface layer is b qq~wwn sandy loam about
<br />12 i ches thick. The underlying atlerial to a depth of 60
<br />in es is pale brown calcareous me sandy loam.
<br />ermeability is rapid. Av ' ably water capacity is
<br />oderate. The effective ro ing depth is 60 inches
<br />more. Surface runoff is sl ,and •.he erosion Nazar is
<br />low.
<br />This soil is used almo entirely i[or irrigated cro s. It
<br />is suited to all crops c monly grown in the aze .Land
<br />leveling, ditch lining and installing pipelines ay be
<br />needed for proper w er application.
<br />All methods of ' 'gation are suitable, but arrow ir-
<br />rigation is the mo t common. Barny rd man a and com-
<br />mercial fertilizer a needed for top fields.
<br />In nonimgat d areas this soil is suited t winter wheat,
<br />barley, ands ghum. Most of the cre a is planted to
<br />winter whe .The predicted averag y eld is 28 bushels
<br />per acre. T e soil is summer fallow in alternate years
<br />to allow oisture accumulation. Gen ally precipitaiton is
<br />too low r beneficial use of fertiliz
<br />Stub a mulch farming, stripcro pig, and minimum til-
<br />lage a needed to control wale erosion. Terracing a]
<br />may a needed to control water erosibn.
<br />e potential native veget lion on this range si is
<br />d mated by sand blueste ,sand Ireedgrass, and blue
<br />ama: Needleandthread, witchgra$s, sideoats rams,
<br />and western wheatgrass are also )prominent. P tential
<br />production ranges from ,200 pounds per acre i favora-
<br />ble years to 1,500 you sin unfavorable years As range
<br />condition deteriorates the sand bluesEem, son reedgrass,
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