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Soil Science Society of America Journal 65:811-819 (2001)
© 2001 Soil Science Society of America


DIVISION S-5 - PEDOLOGY

Predicting bulk density of Ohio Soils from Morphology, Genetic Principles, and Laboratory Characterization Data

F.G. Calhoun, N.E. Smeck, B.L. Slater, J.M. Bigham and G.F. Hall

School of Natural Resources, The Ohio State University, Ohio Agricultural Research and Development Center, 1680 Madison Ave., Wooster, OH 44691-4096

Corresponding author (calhoun.2{at}osu.edu)

A 937-horizon data set composed of site characteristics, morphology, and laboratory characterization data for soils of Ohio was used to develop soil bulk density (Db) prediction models. We tested the hypothesis that using a combination of continuous variables (laboratory data) and nominal variables (site/state factor and morphological class descriptors) would enable the development of improved Pedo-Transfer Functions (PTFs) for Db. Three primary models were developed. The Lab Model, composed entirely of continuous variables, accounted for 56% of the variability in Db. Using only state factors and morphology as nominal variables, the Field Model explained 69%. A combined Field + Lab Model accounted for 72%. Restricting the data set to samples derived from loess and glacial till generated a Field + Lab Model that explained nearly 80% of the variability in Db for a subset of 402 horizons.

Abbreviations: Db, soil bulk density • n, number of observations • P, probability • PTF, Pedo-Transfer Function • SD, standard deviation • SE, standard error • SOC, soil organic carbon • SS, sum of squares




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Copyright © 2001 by the Soil Science Society of America.