In addition, Carter and Hurley soils contain appreciable amounts of exchangeable sodium in the control section. Onita soils are in swales. Reliance soils are in the same landscapes. Onita soils have mollic epipedons thicker than 20 inches. Reliance soils do not have contrasting clayey material within a depth of 40 inches.
Surface runoff is medium or high.
Permeability is slow. About equally divided between native range and cropland. Winter wheat, corn, grain sorghum, and alfalfa are the principal crops. Native vegetation consists mainly of western wheatgrass, green needlegrass, needleandthread, sideoats gram, blue grama, sedges, and forbs. South-central South Dakota.