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Fragipan Soils: Morphological Relationships¹

ABSTRACT

Field descriptions and certain laboratory data for 17 soil profiles representing Bedford, Calloway, Dickson, Grenada, Henry, Mercer, and Tilsit series in Kentucky were obtained. All of the soils contain fragipan horizons. Each genetic horizon of each profile was characterized by morphological description, including pH. Greatest thickness of pan development occurred in the poorly and somewhat poorly drained loessial soils; moderately welldrained soils developed in limestone residum with loess additions was second in thickness of pan development; well-to-moderately well-drained sites from loess-free limestone residium was third; moderately well drained mixed sandstone, shale, and siltstone residuum fourth; and moderately well-drained deep loess least. The poorer the drainage the greater the pan development in deep loess. Colors in the pan horizons tended to differ from those above by having more yellowish hues and depressed chroma. Pan horizons generally contained more clay and correspondingly less silt than the horizon above the pan. Pans were generally more acid, ranging around pH 5, than horizons above or below. Pans tend to reversibly lose their characteristic consistency under wet conditions.

¹ Published with approval of the Director of the Kentucky Agri. Exp. Sta., Lexington. Presented before Div. S-5, Soil Sci. Soc. Am., Ithaca, New York, Aug. 21, 1962.

² Associate Professor of Agronomy.

Received for publication March 9, 1964. Accepted for publication June 15, 1964.