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Composition and Precision of Classification of Several Mapping Units of the Appling, Cecil, and Lloyd Series in Walton County, Georgia¹

ABSTRACT

Soils of the Appling, Cecil, and Lloyd series comprise about 80% of Walton County, Ga., according to a medium-intensity soil survey completed in 1962. To study the composition and precision of classification of mapping units of these series, straight-line transects using the point-intercept method were made along diagonal lines across 16 randomly selected 160-acre blocks of land. The soil was checked every 33 paces along these transects on mapping units of the Appling, Cecil, and Lloyd series. Slope was mapped correctly at 91% of the 518 stops; texture of surface layer, 82%; erosion, 77%; soil series, 74%; soil type, 64%; and all of these, together, were correct at 59% of the stops. All but one of the 19 mapping units studied contain more than 15% of inclusions of other soils. The mapping, however, is highly reliable from the standpoint of grouping pedons that can be interpreted similarly. Only a small proportion of included soils would behave differently from the dominant soil in each mapping unit.

¹ Contribution from the Soil Conservation Service, USDA, and the University of Tenn. Presented before Div. S-5, Soil Science Society of America, at Kansas City, Mo., Nov. 15–19, 1964.

² Assistant State Soil Scientist, Soil Conservation Service, USDA, Athens, Ga., and Associate Professor of Agronomy, University of Tenn., Knoxville, Tenn., respectively.

Received for publication November 23, 1964. Accepted for publication April 12, 1965.