Cultivation has leveled the gilgai microrelief in most areas. Mean annual precipitation ranges from 28 to 40 inches. Mean annual temperature ranges from 62 to 65 degrees F. Thornthwaite annual P-E indices range from 44 to 64. These are the competing Burleson series and Heiden Durant , Grainola , and Shidler series. Burleson soils occur on broad ridgetops or flats.
Heiden soils occur on similar landscapes.
Durant soils have argillic horizons and occur on broad ridgetops or flats. Grainola soils have sola less than 40 inches thick and lack A horizons with moist chroma of 1 and usually occur on similar landscapes. Shidler soils have sola less than 20 inches thick over hard limestone bedrock and occur on ridges. Mainly used for range. The native vegetation is a mixture of tall and mid grass prairie.