The Thornthwaite P-E index ranges from 25 to 50. These are the competing Kavett and Mereta series and Nuvalde and Rowena series. Nuvalde and Rowena soils lack petrocalcic horizons and have sola more than 20 inches thick. In addition, Rowena soils have clayey control sections. Runoff is negligible on 0 to 1 percent slopes, very low on 1 to 3 percent slopes, low on 3 to 5 percent slopes and medium on 5 to 8 percent slopes.
Permeability is moderate.
Mainly used as rangeland. Present native vegetation is mainly threeawn, red grama, hairy triden, Texas wintergrass, sideoats grama, buffalograss, curlymesquite, mesquite bushes, catclaw, and cacti. Some areas are used for growing small grains. In west central Texas, mainly in the North Central Prairies, Rolling Limestone Prairies, Central Rolling Plains, Central Basin, and Central Edwards Plateau. The series is extensive with over 500,000 acres.