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ABSTRACT
Surfaces of peds from B horizons of several Illinois soils were studied. Concepts of "structural specific surface" and of "disparity" between the ped surface and ped interior are presented. The ped surfaces are described in terms of accretive (accumulation) and degradational (removal) alteration classes. Aspects of the moisture regime at the ped surface are discussed.
Ped surfaces were sampled by washing kerosene-saturated peds with Calgon solution. Clay in the ped surface generally has more fine clay (<0.04µ) and more coarse clay (>0.5µ) than clay from bulked (whole) peds. Collapse from 14Å to 10Å is less complete on heating to 450°C. for the clay from the ped surface. In samples of peds with significant percentages of both montmorillonite and nonexpanding 2:1 lattice clays, the predominantly accretive ped surfaces have more mortmorillonite than the bulked peds, whereas predominantly degradational ped surfaces have less.
1 Contribution from the Department of Agronomy, Illinois Agr. Exp. Sta., Urbana. Published with the approval of the Director of the Illinois Agr. Exp. Sta. This paper is based on a dissertation submitted by the senior author to the Graduate College, University of Illinois, in partial fulfillment of requirements for the Ph.D. degree. Presented before Div. V, Soil Sci. Soc. Am., Aug., 1958.
2 Soil Scientist, Soil Survey Laboratory, SCS, Lincoln, Neb., and Professors, University of Illinois, Urbana, respectively.
Received for publication August 27, 1963. Accepted for publication June 4, 1964.
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