Houston Black (soil)
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Houston Black Soil extends over 1,500,000 acres (6,100 kmĀ²) 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 [1]. The soil also shrinks and swells with variations in how much water it contains.[2]