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~ detailed soil~ap units ~ EXHIBIT
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<br />map unit descriptions
<br />t-Attvan fine sandy loam, 0 to 6 percent slopes.
<br />This deep: well drained soil is on smooth to moderately
<br />dissected plains. It formed in calcareous gravelly
<br />alluvium.
<br />Typically, the surface layer is dark grayish brown fine
<br />sandy loam 6 inches thick. The subsoil is sandy clay
<br />loam 16 inches thick. The substratum is calcareous
<br />sandy clay loam 5 inches thick over gravelly coarse sand
<br />that extends to a depth of 60 inches or more. In some
<br />areas the surface layer is loam.
<br />Include in ;1is uni, are smaG areas of Ascalon fine
<br />sandy loam, Peetz gravelly sandy loam, and Cascajo
<br />aravelM sandy loam.
<br />Permeability of this Altvan soil is moderate. Available
<br />water capacity is moderate. Effective routine depth is 60
<br />inches or more. Runoff is slow to medium. and the
<br />bazar;; of water erosion is slight to moderate. The
<br />hazard o1 soil blowing is moderate.
<br />This unit is used for nonirrigated crops and as
<br />rangeland. Winter wheat is the main crop.
<br />This unit is suited to winter wheat. barley, oats. and
<br />sorghum. oecause preapitat~on is not sufficient for
<br />annual cropping, a cropping system that includes small
<br />grain and summer fallow is most suitable. Predpitation
<br />usually is too low for crops on this unit to make efficient
<br />use of fertilizer.
<br />Maintaining crop residue on or near the surface
<br />reduces runoff, reduces soil blowing, and helps to
<br />maintain soil filth and organic matter content. Stubble
<br />mulch farming, stripcropping, and minimum tillage help to
<br />control erosion and conserve moisture. Terraces reduce
<br />runoff and the risk of erosion and help to conserve
<br />moisture.
<br />The potential plant community on this unit is mainly
<br />blue grams, needleandthread, western wheatgrass, and
<br />prairie sandreed. The average annual production of air-
<br />dry vegetation ranges from 500 to 1,600 pounds.
<br />If the range is overgrazed, the proportion of preferred
<br />forage plants decreases and the proportion of less
<br />preferred forage plants increases. Therefore, livestock
<br />grazing should be managed so that the desired balance
<br />of preferred species is maintained in the plant
<br />community.
<br />Range seeding is suitable if the range is in poor
<br />condition. The plants selected for seeding should meet
<br />the seasonal requirements oS livestock or wildlife, or
<br />both. Other management practices that are suitable for
<br />use on this unit are proper range use, deferred grazing,
<br />and rotation grazing. Ii the plant cover is disturbed,
<br />protection from erosion is needed. Loss of the surface
<br />layer results in a severe decrease in productivity and in
<br />the potential of the soil to produce plants suitable for
<br />grazing.
<br />This unit is well suited to windbreaks and
<br />environmental plantings. Supplemental irrigation may be
<br />needed when planting and during dry periods.
<br />This map unit is in capability subclass IVe,
<br />nonirrigated, and in Loamy Plains range site.
<br />54-Platner loam, 0 to 3 percent slopes. This deep,
<br />well drained soil is on smooth to slightly dissected plains
<br />and adjacent stream terraces. It formed in calcareous
<br />loamy alluvium.
<br />Typically, the surface layer is grayish brown loam 4
<br />inches thick. The subsoil is clay, clay loam, and silty clay
<br />loam 20 inches thick. The substratum to a depth of 60
<br />inches or more is calcareous fine sandy loam and sandy
<br />loam.
<br />Included in this unit are small areas of Ascalon fine
<br />sandy loam, Manzanoia day loam, and Nunn clay loam.
<br />Also included are soils that nave a fine sandy loam or
<br />sandy loam surface layer.
<br />Permeability Of this Platner soil is slow. Available water
<br />capacity is high. Effective routine depth is 60 inches or
<br />more. Runoff is slow. and the hazard of via!er eresion is
<br />siignt. Tne nazaro of salt plowing is moderate.
<br />This unit is used as nonirrigated cropland and
<br />rangeland. Winter wheat is the main crop.
<br />This unit is well suited to winter wheat, barley, oats,
<br />and sorghum. Low annual precipitation is the main
<br />limgation for the crops that can be grown on this unit.
<br />Because precipitation is not sufficient for annual
<br />cropping, a cropping system that includes small grain
<br />and summer fallow is most suitable. Precipitation usually
<br />is too low for crops on this unit to make efficient use of
<br />fertilizer.
<br />Maintaining crop residue on or near the surface
<br />reduces runoff, reduces soil blowing, and helps to
<br />maintain soil filth and organic matter content. Stubble-
<br />mulch farming, stripcropping, and minimum tillage help to
<br />control erosion and conserve moisture. Terraces reduce
<br />runoff and the risk of erosion and help to conserve
<br />moisture.
<br />The potential plant community on this unit is mainly
<br />blue grams, western wheatgrass, sedges, and
<br />buffalograss. The average annual production of air-dry
<br />vegetation ranges from 500 to 1,500 pounds.
<br />If the range is overgrazed, the proportion of preferred
<br />forage plants decreases and the proportion of less
<br />preferred forage plants increases. Therefore, livestock
<br />grazing should be managed so that the desired balance
<br />of preferred species is maintained in the plant
<br />community.
<br />Range seeding is suitable if the range is in poor
<br />condition. The plants selected for seeding should meet
<br />the seasonal requirements of livestock or wildlife, or
<br />both. Other management practices that are suitable for
<br />use on this unit are proper range use, deferred grazing,
<br />and rotation grazing. If the plant cover is drsturbetl,
<br />protection from soil blowing is needed. Loss of the
<br />surtace layer results in a severe decrease in productivity
<br />and in the potential of the soil to produce plants suitable
<br />for grazing.
<br />This unit is well suited to windbreaks and
<br />environmental plantings. Supplemental irrigation may be
<br />needed when planting and during dry penods.
<br />This map unit is in capability subclass IV, nonirrigated,
<br />and in Loamy Plains range site.
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