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A Genesis Study of a Mohave Sandy Loam Profile¹

ABSTRACT

A Mohave sandy loam profile, representative of Red Desert soils, developed in the Avra Valley in southern Arizona was studied to determine its pedogenesis. A lithologic discontinuity was found at a depth of 60 inches which separates the soil profile from an underlying caliche layer. Only a weak and relatively recent carbonate accumulation is pedogenically associated with the present soil surface. Kaolinite and illite are the predominant clay minerals in the upper layer. Thin sections reveal few clay skins developed in the profile.

¹ Technical Paper 807, Arizona Agr. Exp. Sta., Tucson. Contribution from the Department of Agricultural Chemistry and Soils. Portions of the paper are from a dissertation presented by the junior author as partial fulfillment of the requirements of a M.S. degree.

² Asst. Professor, Department of Agricultural Chemistry and Soils, University of Arizona, Tucson, and Chief of Regional Soil Testing Laboratory, Izmir, Turkey, respectively.

Received for publication May 31, 1963. Accepted for publication August 9, 1963.