2003-03-26_REVISION - M1984026 - Laserfiche WebLink

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P.IO GRANDE COUNTY AREA, COLORADO moist; massive; slightly hard, friable; calcareous; very strongly alkaline. The A horizon is 9 to S inches thick. In cultivated areas the A3 horizon has been mixed ir.CO the p!ou~ layer. The P,?t horizon; is 4 to 16 inches thick. Exchangeable sodium in the B horizmt and in the upper part of the C horizon ranges from 15 to 30 percent Depth to the sandy C horizon is generally 30 to 40 inches. ,lIs-~Ioeca loamy =and. This pearl}- level soil oc- cupies old flood plains and the lower end of broad alluvial fans in the east-central and northeastern parts of the Area. Slopes are 0 to 1 percent. The water table is at a depth of 48 to GO inches. About IO percent of this unit is included areas of San Luis sandy loam, LAOrte gravellc sandy loam, and Gunbarrel loam}- sand. Some areas are about 5 percent areas of Hooper loamy sand. Spots of Zinzer and San Arcacio soils occur in places. Runoff is slow. The soil blo«-ing hazard is high. This soil is used for irrigated potatoes, small grain, alfalfa, and vegetables and for range. Capability unit IIIe-? irrigated, ~'lIe-1 nonirrigated; Salt Flats range site. Norte Series The Norte series consists of moderately well drained soils 24 to 40 inches deep over gravel and sand. These soils formed in gravelly alhn~ium on broad alluvial fans. Slopes are 0 to 1 percent. Elevation is 7,b00 to 8,300 feet. Natural vegetation is dominanth' blue grama, Indian ricegrass, and lots rabbitbrush. The average an- nual precipitation is about 7 inches, the mean annual air temperature is about,~ll° F, and the Post-fi~ee sea- son is 90 to 100 days. Ina representative profile the surface lacer and underlying material to a depth of 30 inches ace dark g'ray-ish brown gravel(}~ sanch- loam. Pelow this is very ~~~racellc loamy- sand that extends to a depth of GO inches or more. Permeability is moderatelc rapid, and the available ~yater capacity is low or moderate. Reaction is mod- eratelc alkaline. The effective rooting depth is 2d to 40 inches. T1te seasonal high water table is at a depth of 36 to GO inches. These soils are used for irrigated crops and for range. Representative profile of Norte gravelly sanch- loam, 300 feet east and 2 i-]0 feet north of the soutluyest corner sec. 18, T. -10 ?\., E. 8 E. Ap-0 to 4 inche; light bro~~~ni.=h gray (lOYR 6/'?) gravellc sandy bran; dark grayish brotyn (10~-P. 4/?) moist; mnderxte foe granular structure: sofC very friable; 15 percent gravel; calcareous; mod- er,itelc alkaline: cienr smooth boundary. AC--Z to 1? ~ inches; light brotynish grac (lOTP. 6/2) gravel(}- sand}- loam, dark ~rayish brotcn (lOYP. d/2) moist; tweak medium su~angular blocky struc- ture; slightly- hard, very friable; ?0 percent gravel: calcareous; moderatelc alkaline: grndual wavy belm(lar V. Cl-Y2 to 30 inches Light brotcnish gray pOYR fi/2) ~~rayelly sand}- loam, dark grayish brown (l0I"P. 9/P) moist; massive; sliglalc hard, yerc friable; 30- percent gravel; some discmrtinuous accumu- lations of visible secondary carbonate as concre- tions and coatings on gravel fragments; calcare- ous; moderately alkaline; gradual tcavy boundary. 23 IIC?-30 to 60 inches; very gravellc loamy sand; gravel and sand give a grayish cast on exposere; 50 to 80 percent gravel and cobbles. The A horizon is gracelk sandy loam or _andy loam. The content of gravel ranges from o to ?$ percent in the .4 and C horizons and from 1~ to ;5 percent in [he Cl horizmt. Depth to the IiC horizon is ?-( to 40 inches. Thi; horizon is eery gravelly (Dame sand or sand that i; i0 to SU percent gravel and cobbles. No-Norte gravelh saadv loan[. This pearl}~ level soil occupies the ]ova- end of broad alluvial fans, mainly in the northeastern part of the Area. Slopes are 0 to 1 percent. The profile of this soil is the one described as representative of the series. The [voter table is eom- monly- at a depth of 36 to GO inches and is highest in summer. It is manipulated be a system of chains and checks. About 25 percent of this tutu is included areas of Quamon gravelly sand}~ loam, 10 percent areas of Dunul cobbl}- sanch- loam, and 10 percent San Arcacio sandy loam. P,unaff is slow. The soil blowing hazard is moderate. This soil is used most(}- for irrigated crops, chiefly potatoes. Small grain, alfalfa, and vegetables are also grown. Some small areas are used for range. Capability unit IIIs-? irrigated, FIIs-7 nonirrigated; Il~Iountain Outtvash range site. Nr-Norte-Donal complex. This nearly level map- pim~' unit occupies the upper end of broad alluvial fans, mainly in the north-central part of the Area. Slopes are 0 to 7 percent. This unit is about 40 pet•cent Norte gravely- sandy loam and I0 percent Dunul cobbl} sandy loam. In unleveled areas there are many small stcales and ridges. The ridges are 1 to 2 feet higher than the styales. Norte gravel(} sandy loam and Dunul cobbly sandy- loam have the profiles described as representative of their respective series. About 20 percent of this unit is included areas of Quamon gravelly- sandy loam. Popoff is slow. The soil blowing hazard is low to moderate. This mapping unit is used for irrigated potatoes, small grain, alfalfa. and vegetables and for range. Capability- unit I~~s-7 irrigated, ~'IIs-7 nonirrigated; D[ottntain Outtyash range site. Platoro Series The Platoro series consists of cell drained soils 20 to 40 inches deep over gravel and sand. These soils formed in alluvium Dyer gravelly- alluvium on alluvial fans and terraces. Slopes are 0 to 3 percent. Elevation is 7,600 to S,S00 feet. Natural vegetation is dominantly bhte grama, Indian ricegrass, ring muhly, and western wheatgrass. The ayerae~e annual precipitation is about S inches, the mean annual air temperature is about 41° F, and the frost-free season is 90 to 105 does. In a representative profile the surface layer•and up- per 3 inc!tes of the subsoil are dark grayish brown loam. The lower ll inches of the subsoil is dark brown light clay loam. The substratum is about 8 inches oY dark bro~yn eery gravellc loam over very- gravelly sand that extends to a depth of GO inches or more. These soils are used for irrigated crops and for range.