Houston Black (soil)

Houston Black (soil)

Houston Black Soil extends over convert|1500000|acre|km2 of Texas and is the Texas state soil. The Houston Black Soil has expansive clays and are classic vertisols. Houston Black soils are used extensively for grain sorghum, cotton, corn, small grain, and forage grasses [ US Department of Agriculture Natural Resources and Conservation Service - Houston Black [http://www.tx.nrcs.usda.gov/soil/statesoil.html] (accessed 11 February 2008)] . The soil also shrinks and swells with variations in how much water it contains. [University of Illinois Urban Resources [http://www.urbanext.uiuc.edu/soil/st_soils/tx_soil.htm|] ]

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