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Houston black soil extends over 1,500,000 acres of the Texas blackland prairies and is the Texas state soil. The series is composed of expansive clays and is considered one of the classic vertisols.
Houston black soils are used extensively for grain sorghum, cotton, corn, small grain, and forage grasses. In their natural state, they support mostly tall and mid grass prairies of big bluestem , sideoats grama , switchgrass , little bluestem , and indiangrass , with some elm , hackberry and mesquite trees. The soil also shrinks and swells with variations in how much water it contains. In the USDA taxonomic system it is designated an "Udic Haplusterts".
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