An Initial Compilation of Soil Analysis Data in the Southern Great Plains.

Soil analyses data are used to guide crop management decisions. Soil analysis data from Kansas and Oklahoma producers were collected and compiled from 187 locations, comprising 18 counties in northern and central Oklahoma and 3 counties in south central Kansas. This compilation includes macro- and micronutrient concentrations as well as soil pH, organic matter content, and cation exchange capacity data. The data are from soil samples collected primarily at 0-15 cm depth with some from 0-30 cm. Number of samples per location ranges from 2 to 126 depending on location size. This data set provides an opportunity to analyze trends (i.e. pH, organic matter content, nutrient concentrations) across soil types at a regional scale. Data indicate that soils in Kansas and Oklahoma tends to be more acidic with 168 out of 184 locations having average pH below 7.0 and 81 locations having maximum pH of 6.9 or less. Majority of the soils in Kansas and Oklahoma are high in phosphorus (63%) and potassium (66%). Mean phosphorus concentrations from all locations ranged from 5 to 92.7 ppm and 5.5 to 59.2 ppm for Bray 1P and Mehlich 3, respectively. Mean potassium concentration ranged from 27.8 to 544.9 ppm.