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Caliche in Southwestern Idaho¹

ABSTRACT

Deposition of caliche in the soils of southwestern Idaho probably results from soil-forming processes. Caliche occurring on the lower, intermediate, and upper terraces of the Boise and Snake Rivers is described. Close correlation of the present ground surfaces with the top surfaces of the caliche layers is found. The pedogenic development of the soils is related to the ages of the terraces on which the soils occur, and also to the thickness and induration of the caliche layers. The thickness of the C_ca horizon decreases or disappears entirely as the age of the soil and terrace increases. Calcium carbonate and silicates increase in the caliche horizons as the soils and terraces increase in age.

¹ Contribution from the Departments of Agronomy and Agricultural Chemistry, published with the approval of the Director of the Idaho Agr. Exp. Sta., Moscow, as Research Paper No. 487. Presented to the Western Society of Soil Science, June 17, 1959, at San Diego, Calif.

² Formerly Research Technician, University of Idaho, now Soil Scientist ARS, USDA, Utah State University, Logan, Utah, Associate Agronomist and Associate Agricultural Chemist, University of Idaho, Moscow, respectively.

Received for publication April 18, 1960. Accepted for publication October 6, 1960.