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Plnloru Scrir•s a
<br />The Platnro sel'le$ consists of +cell drained soils 20
<br />to 90 in(•hes rlecp o4er gravel and sand. These soils
<br />fm-med in alluvium over gravelly- alluvium an alluvial
<br />fans :md terraces. Slopes are 0 to 3 Iterccnt. ];levation
<br />is 7,G(10 to 8,;(ID feet. Natural vegetarian is dominantly
<br />blue grtma, ]ndian ricegrass, ring mutely, and ++csthrn
<br />++•heatgrass, The average annual )n'ecipit;ltion is about
<br />8 inches, the mean annual air temperature is about
<br />9l° F, and the frost-free season is 90 to 705 days.
<br />]n x representative profile the surface layer and up-
<br />per .', inches of the subsoil are d:u-k grayish brown
<br />loam. The lower 11 inches of the subsoil is dark brown
<br />light cla}• loam. The substr:~tum is about 8 inches of
<br />dark Lrown eery gravelly loam over very gr;tvelly sand
<br />that extends to a depth of 60 inches or more.
<br />These soils are used for irrigated crops and for
<br />range.
<br />F,ryn-esrntatice profile of Platoro loam, 0 to ]percent
<br />slopes, 400 feet east and 50 feet south of the north+t est
<br />corner sec. °6, T. 37 N., P.. 7 E.
<br />Al-0 to 9 inches; light brownish e-ray (10]-P. 6/2) light
<br />loam, dark gra}'ish hrou-n (10)'R 4/?) moist;
<br />moderate fine ^ranular structure; soft, crrr fri-
<br />able; 5 percent gra eel; ralea rrous; nmrlrratelp
<br />alkaline; clear >inoath Lovndary.
<br />R]- 4 to i inches; light brvtccnish grac (lU]'R G/?) heavy
<br />loam, dark gr:p~ish Mrocvn (]OYR 4/?) moist; w. al:
<br />medium suhangular blocky strucf ore petting to
<br />moderate medium granular: slightly hard, very
<br />friable; a fea~ patchy clay films on some Ards; 5
<br />perernt gravel; ralc:u~rous; mnderate)>' alkaline;
<br />clear smooth },nunriarc.
<br />B2t--7 in li inehr•s; brmcn flfll'P. 5/v) light rlac loam,
<br />,lark bro+.m (IG)"B 4/3) moist; mnderate medium
<br />pr'i~n:atir st nu•tu t'e pL ding to m~idr,:a to n.; rlium
<br />>.~La ocular blocky; eerc hard, firm; thin patchy
<br />clay films on prds and in root , hato,rl:; ~ perct•nt
<br />grac'el; rah;a rrous; nwd,~ratelc alkaline; gradual
<br />cc ace hminda ry.
<br />BSca -15 to 13 inrhrs; Lrorcn (10]'R ~~3) light clay loam,
<br />dark hroccn (]0]'P, 4/3) moist; ~crak I~,rdium
<br />sul:a r.rular blocky s(ructurr; crrr },:+rd, fria Lle;
<br />thin patchy clac films on pt-d s, rlisrmdinuous cla}•
<br />filnv in root r1-,anuels; 10 percent gravel; visible
<br />srcmula rc calcium ca r4onatr nrru rrinr as euncre-
<br />tinns and as roaGngs mI grac el: ralca rrous; mud-
<br />eratele alkaline; gradual rc arc bon adore.
<br />Cleo-]8 to 2G inches; brmcn (]OYR 5/3) eery grac elly
<br />loam, dark 1•ro+rn 17U)'P. 4; 3) nu,ist; massive;
<br />hard, friahlz; GO pct rent gravel; visible srrm.da rc
<br />calcium ca rl~una4 nrcurrinS as emirrelions in thin
<br />sea m. and 5t rr ;aks cart as ,ualings in the gravel;
<br />calca rrous; nu~drrately alkaline; gradual way}•
<br />ha~nda ry.
<br />IIC'_ra-_'G to GO inrhrs; cerF gra eel h~ sand; visible wrnnd-
<br />ar}~ calcium ra chancre orrurring as coatings un
<br />coarse fragments.
<br />The A7 hurt zun is 3 to G inches [hick. ]n cul[icalyd areas,
<br />hoverer, it is slightly thicker. ]f is rlac 1n:un in snore prdons
<br />in cultivated fields and is sandy loam in some arras of
<br />range. The R°t horizon is 8 to L' inches [hick. The .4 and
<br />B horizons are 3 to °_0 percent gravel and in some arras 10
<br />prrernl tnhblrs. Depth In the gra Telly IIC horizon ranges
<br />from _^0 to AO iurhe~. llt-plh to cisi}~le lime ranges from ]U
<br />to 40 iorhes.
<br />Pa.~- -plalorn Ina nt. 0 10 1 l,t•rrrnl =lupec. 'I'bis
<br />nearl> le+el soil occupies alluvial fans clung the western
<br />edge of the calle>- and terraces Gong the F.io Grande
<br />west of net \orte. The profile of this soil is the one
<br />described as represenhttice of the series..4hont 10 per-
<br />tettt of this unit is included area= of Gra+•point r~ravelh-
<br />s:,ndy loam and 5 percent :u•eas of Derrick cohbh loam.
<br />Runoff is slow. The erosion hazard is slight.
<br />This soil is used for irrigated potatoes, small grain,
<br />alfalfa, and vegetables and for range. Capability unit
<br />Ills-3 irrigated, \-11s-? nonirrigated; Mountain Out-
<br />wash range site.
<br />Pali-Plnir boon, 1 in 3 prrrrnl .logy.. This eery
<br />gentl}• slapin nil ncc•upies alluvial fans clung the
<br />+erstcrn edge of the rule>- and t(•rrares :Ilan); the
<br />P.io Grande +r'est of Del \nrte, About ]0l,erc•rnt of this
<br />unit is included :wens of Cracpuint graeellc sonde loam
<br />:md about ~, percent areas o1' 1)erritk cobbl}' la:un.
<br />P.uno(f is mnderate. The erosion haz:u•d is slight,
<br />This soil is used for irrigated potatoes, small grain.
<br />and alfalfa and for range. Capability unit Ille-.^, irri-
<br />g:Ited, VIIs-2 nonirrigated; Afuuntain Outwash range
<br />site.
<br />Quanum Series
<br />The Quamon series consists of sume+rhat excessively
<br />drained soils ]? to 25 inches deep over gravel and sand.
<br />These soils formed in 6rravelh• alluvium mt broad al-
<br />luvial fans. Slopes are 0 to 7 percent. Elevation is 7,G00
<br />to x,:,00 feet. N;dural +c~~etation is dominantly blue
<br />gr:,ma, lu+v rabbitbrush, and Indian ]"I('C;;1'acs. The
<br />average annual pret•ipitatiun is about 7 inches, the
<br />mean annual air tentllerature is about 91° F, and the
<br />frost-free season is 90 to 700 days.
<br />]n a representative profile the surface layer is dark
<br />brown rrravellc sandy lo:un about 5 inches thick. The
<br />nnrlerlving material is 17 inches of dv'k Urocrn gravelh•
<br />sxnd~ loom over cellowish bro+rn verc gracellc sand
<br />that extends to a depth of 60 inches or more.
<br />Permeability is nttlderntely rapid, and the a+•ailable
<br />water c:tpacitc is low. Reaction is moderately alkaline.
<br />The effective rooting depth is ]? to °_5 inches. The
<br />uaier tattle (iuctuntes britveen depths of ;6 :utd 60
<br />inches.
<br />fl~ese sails are used for irrigated crops and fw•
<br />ra n tee.
<br />Pepresentatice profile of Quamon gracellc sandy
<br />lu;tnt. 100 feet ~cest and ],~00 feet south of the nw•th-
<br />t°ICt corner sec. 18, T. 90 \., 1:. S E.
<br />Ap- D to 5 inches; brown (10] R 5/3) grac rlly s:nulc lrtm,
<br />dark hn~rr'n (1(I)'P. 4/3) moist; mud. rate fine
<br />gra milar =l nurture; soft, re ry fria}de; 30 prrrent
<br />gi acct and cobLlt•s; slightly calca rrous; mnderat ely
<br />alkaline; gradual smooth boundary.
<br />Cl 5 to 7G inrhrs; brmcn (1aYR v/3) graorllc sandy loo nr,
<br />d:n~k l~roryn (]O]-R 4/2) moist; rcral, r,~a rse sub-
<br />angular blorkc st curio re pn cling to fine p~anul:+r;
<br />=oft, ccn• friable; ?~ prrcrnt gr:+rrl and cnLhl rs;
<br />slightly calea rrous; nmdr retel t' alkaline; gradual
<br />smooth Lou ndary.
<br />11 C?-1G to GO inches, light 7rllucci<h Lrocrn (]0}-R G/4)
<br />crrr gravelly sand, yellun~ish hrocrn (IOSR ii/4)
<br />moist; single grained; Inosr; G,i prrunt gracrl and
<br />cobbles; calm rrous; mod,~ratel ~~ alkaline.
<br />The Ap horizon is 5 to ]0 inches thick in colt it acrd an as.
<br />The rnntrnt of cna rse fragments, gnmin:nlt ly gracrl, ra i.~rs
<br />from 7~ to 3D percent in [he A horizon and from ]0 to .',6
<br />prreent in the Cl horizmt. ]n some anss the you L~nt of
<br />rabbles is as much as ]0 percent. Coarse G-agmrnts in the
<br />i1C horizon are dominantly gravel.
<br />Oa-(lnamun _rarelly sandy loam. This nearly le+el
<br />soil occupies the lotrer end -of broad alluvial fans.
<br />n:ainh in the northe:IStern part of the Arca. Slopes are
<br />0 to 1 )percent. The water table is ~cnerally nt a depth
<br />of :,6 to f, inches and is highest in summer. It is man-
<br />ipulated b>- a scstem of chains vtd checks. About °5
<br />percent of this unit is included areas of \orte gracellc
<br />sandy loam and ] ~ percent areas of Dunul cobbh' sands
<br />tram. Also inchtded are small areas of San Arcacio
<br />sandy loam.
<br />I.unotT is slmc. The soil blowing hazard is mnderate.
<br />This soil is used mostly for irrigated crops, chiefl}-
<br />potatoes. Other crops are small gt:ain, alfalfa, and
<br />vegetables. Some small areas are used for range. Capa-
<br />bilitc unit ICs-°_ irrigated, \'1[s-7 nonirrigated; ~Inun-
<br />tain Out+r-ash range site.
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