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SOIL SUIRVEY OF LUBBOCK COUNTY, TEXAS. 27
thin stand of grass, and bunch grass, mainly species of Andropogon.
is more common than on the heavier soils of the county.
The following table gives the results of mechanical analyses of
samples of the soil and subsoil of the Brackett fine sandy loam:
Mechanical analyses of Briacktt fine sandy loam.
Fine Coarse Medium Fine Very fine
Number. I Description. ne san. sa s sand. lt lay
gravel. sand. sand. sand.
,! r cent. PetPer cent. Pe r cn t. r Pc r cent. P Pr cen t Per cent. Per cent.
r Per cent. Pe cent.
445005 .. ...... Soil .......... 0.0 0.5 1.7 9.5 20.6 13.2 4.1
445006. -..... Subsoil.....
.1 .6 2.3 53.3 20.0 15.0 8.2
Th3se samples contained more than one-half of 1 per cent calcium carbonate (CaC03): No. 445005, 15 per
cent, and No. 445006, 21.02 per cent.
BIRACKETT LOAM.
The Brackett loam consists of a light-brown to ashy-gray friable
loam which grades at 6 to 10 inches into gray or pale-yellowish loam
to clay loam. This passes into whitish or pale-yellowish, rather
chalky, highly calcareous material. Whitish marl or greenish-gray
calcareous clay is frequently reached at 10 to 20 inches, with the hard
marl in many places lying but a few inches below the chalky material.
The surface soil is apparently lower in organic matter than
that of the Richfield and Amarillo types, and the subsoil is more
friable. The soil is highly calcareous throughout the 3-foot section.
The type as mapped includes much soil which is a silt loam in texture.
The distinction between the two classes in this county is not regarded
as important.
The Brackett loam occurs in small, widely separated bodies of 10
to 60 acres. It is developed principally on low ridges forming the
rims of the deeper lake basins and on the smooth slopes adjacent. It
is also encountered on the rim of the basinlike valley of Yellowhouse
Creek in the vicinity of Shallowater and westward.
The type occupies only a small total area and is of minor importance.
Only a few small patches have been placed under cultivation.
The soil apparently does not retain moisture as well as the
lighter textured soils of the Amarillo and Richfield series. The grass
growth is not as thick as on associated soils, but the smoother land
affords fair grazing.
Brackett loam., colluvial phase.-The Brackett loam, colluvial
phase, is predominantly a light-brown friable loam, generally containing
some fragments of white, impure lime rock. There is little
distinction between soil and subsoil, the material simply becoming
light yellowish brown or grayish with depth, with little change in
structure or texture in the 3-foot section. The soil, however, is not
everywhere typical, varying from grayish to dark brown in color,