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Quantifying Pedogenesis for Soils with Discontinuities¹

ABSTRACT

Comparing calculated values of changes with observable features in relatively young soils is one way of testing genetic assumptions. If the agreement is acceptable, then the probability that the assumptions are correct increases. Two sites similar in most properties other than initial carbonate content of parent materials were examined and found to also have similar lithologic discontinuities. Soil development across parent material boundaries necessitates additional judgments about the initial state, consequently different trends of bulk density and selected mobile and immobile constitutents were estimated for each material in each profile and changes in the systems calculated. The reported values are not based on vertical homogeneity, and yet the changes seem to correspond to, and be supported by, morphological observations. It is concluded that this Hapludalf and this Fragiochrept developed under similar soil systems.

¹ Contribution from the Dep. of Agronomy, Cornell Univ., Ithaca, New York. Agronomy Paper No. 972.

² Former Graduate Assistant (now Research Scientist, Research Station Canada Dep. of Agriculture, Frederiction N.B.), and Associate Professor of Soil Science, Dep. of Agronomy, Cornell University, respectively.

Received for publication February 4, 1972. Accepted for publication November 17, 1972.