Soils range from coarse sands to tight or compact clays. Most contain lime and salt. Bottomland soils are reddish brown, sandy to clayey, alluvial soils. High Plains About 20 million acres with virtually no trees. The area is very level, and the soils are very porous which prevent effective drainage.
Rainfall is relatively light.
Most vegetation includes grass and brush. Soils are brown to reddish, mostly deep clay loams, sandy loams, and sands. Shrubs, cactus, and sparse grasses are found here. In the mountains, some forest trees and vegetation may be found. Upland soils are light reddish brown to brown clay loams, clays and sands which are mostly high in lime and salt.