The Rio Grande series consists of deep, well-drained, nearly level to gently
sloping soils on the active part of the flood plain along the Rio Grande and on alluvial
fans along its major tributaries. These soils are infrequently flooded. They formed in
recently deposited, friable, stratified silty sediments that are high in content of lime.
The slope range is 0 to 3 percent.
In a representative profile the surface layer is light brownish-gray silt loam about 7
inches thick. The underlying material, to a depth of 20 inches, is light brownish-gray,
friable silt loam. Below this, to a depth of about 63 inches, it is pale-brown, very
friable silt loam and thin strata of very fine sandy loam and silty clay loam.
Internal drainage is medium, permeability is moderate, and the available water
capacity is high.
Rio Grande soils are well suited to crops and are used mainly for irrigated crops.
A few areas are dryfarmed, but the low rainfall is a limitation to dryfarming in most
years. A small acreage remains in range.
Representative profile of Rio Grande silt loam, 0 to 1 percent slopes, 1.25 miles
south, 43° east of La Grulla, 50 feet east of a private road from a point that is 1.0 mile
south of its intersection with the main east-west street in La Grulla.
courtesy of:
http://soildatamart.nrcs.usda.gov/Manuscripts/TX427/0/Starr.pdf
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