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Studies of Clay Skins in a Cecil (Typic Hapludult) Soil: I. Composition and Genesis¹

ABSTRACT

Continuous clay skins are found on ped faces, in pores, and around root channels in the B22t horizon of Cecil soils in North Carolina. Thicker, discontinuous clay skins are also observed along vertical pores in the Cl horizon. Compared to the whole peds from the B22t horizon the clay skins contain more clay, fine clay (<0.2µ), total iron, free iron, Al₂O₃, K₂O, P₂O₅, and total nitrogen; less silica and gibbsite than the whole soil peds. The fine clay fractions (<0.2µ) of the A2 horizon and the clay skins of the B22t horizon are similar, both being finely divided and poorly crystalline compared to the fine clay from the whole peds of the B22t horizon and the clay skins in the Cl horizon.

¹ Paper no. 2602 of the Journal Series of the N. C. State Univ. Agr. Exp. Sta., Raleigh, N.C.

² Graduate Research Assistant, and Associate Professor, respectively.

Received for publication March 29, 1968. Accepted for publication June 13, 1968.