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Variation of Soil Morphological Properties Within Miami, Celina, and Crosby Mapping Units in West-Central Ohio¹

ABSTRACT

Variation of soil morphological properties within mapping units of Miami, Celina, and Crosby soils in Ohio has been statistically summarized. Ten randomly selected profiles within each of 24 mapping delineations of these soils were sampled for this characterization. The most variable properties were horizon thickness, depth of leaching of carbonates, loess thickness, depth to mottling, pH, and class (size) of soil structure. Clay content, grade (strength) of soil structure, and soil color were least variable. The number of observations required to estimate the population mean of the above parameters within certain limits using a .95 confidence interval was computed. These soils were correctly classified with regard to great group at 96% of the 240 observations, to subgroup at 85%, to soil series at 42%, and to soil type at 39%. Parent material was mapped accurately 88% of the time; erosion, 94%; pH, 70%; solum thickness, 63%; and drainage class, 65%. Since all delineations contained 30% or more inclusions of other soils, these mapping units would be considered complex or undifferentiated units based on the present concept of a mapping unit. It is proposed that the concept of the mapping unit be modified to emphasize the dominant soil of the area rather than implying 85% mapping accuracy of a specified soil.

¹ Contribution from the Department of Agronomy, Ohio Agr. Exp. Sta., State Project 103, Journal Paper no. 7–65; Division of Lands and Soil, Ohio Department of Natural Resources; and Soil Conservation Service, USDA. Presented before Div. S-5, Soil Science Society of America, Kansas City, Mo., Nov. 19, 1964.

² Respectively, Assistant Professor of Agronomy, Ohio Agr. Exp. Sta.; Assistant Chief, Division of Lands and Soil, Ohio Natural Res. Dept.; and Correlator, Soil Conservation Service, USDA, Columbus, Ohio.

Received for publication February 8, 1965. Accepted for publication August 4, 1965.