Mean annual precipitation ranges from about 18 to 24 inches. The more clayey Ness soils are in depressions. Uly soils lack argillic horizons. Well drained and moderately well drained. Runoff is slow and very slow.
Permeability is slow.
Most of the Spearville soils are cultivated. The main dryland crops are wheat and sorghums. When irrigated the major crops are wheat, grain sorghum, corn, and alfalfa. Native vegetation is short and mid grasses. The series is of large extent.