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Accuracy in the Identification of Subgroups Delineated by a Sample-Based Soil Association Map¹

ABSTRACT

A procedure to develop Seventh Approximation primary and secondary subgroup soil maps was applied to sample data for Christian county, Ill. A measure of accuracy of the resulting subgroup soil association map was determined by comparison with the modern detailed Christian county soil survey. The two most dominant subgroups of soils in two-thirds of the county were identified correctly using a sample-based soil association map. One of the two most dominant subgroups of soils was identified correctly in most of the remainder of the county. The virtual absence of areas where the two dominant subgroups of soils were incorrectly identified is further evidence that the Seventh Approximation maps based on sample data can be used in those areas of the world needing modern soil information.

¹ Contribution of the Department of Geography and Geology, Eastern Illinois University, Charleston; and the Department of Agronomy, University of Illinois at Urbana-Champaign.

² Assistant Professor of Geography and Geology, Eastern Illinois University; and Associate Professors of Soils and Biometry, University of Illinois at Urbana-Champaign; respectively. The authors are grateful to the Eastern Illinois Research Committee and the Illinois Agr. Exp. Sta. for supporting this project.

Received for publication February 7, 1970. Accepted for publication March 16, 1970.