Spatial Variation of Sand Content and pH Within Single Contiguous Delineations of Two Soil Mapping Units

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Abstract
Quantitative estimates were made of the rates of spatial variation of soil properties within each of two sampled areas displaying contrasting patterns of variation. Samples were collected at 10‐m intervals on two sampling grids, each 8 by 20, positioned on contiguous delineations of the Ladysmith and Pawnee series in eastern Kansas. The Pawnee is developed from glacial till, the Ladysmith from fine‐textured sediments.Spatial variation of sand and pH measurements within both of the sampled areas was studied using the semivariance, a statistical function tailored for the analysis of continuous geographic variables. There is a contrast in spatial variation of sand content within the two areas; in the Ladysmith area, a distance of 30 m is sufficient to encounter full variation of sand content, but in the Pawnee area, a distance of 40 m is required. pH has random variation within both areas. This information can be used to select optimum spacing of samples in designing soil sampling plans.

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