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Comparison of Statistical and Standard Techniques to Classify and Delineate Sodic Soils

Extension Agricultural Engineering

J. L. Richardson^* and R. E. Knighton

Dep. of Soil Science, North Dakota State Univ., Fargo, ND 58105

*Corresponding author.

ABSTRACT

Statistical estimates of soil variability within and among delineations of taxonomic units are useful in designing and checking classification systems. We compared soil classification and spatial differentiation of a landscape dominated by sodic soils. Both statistical methodologies and standard soil-survey techniques were used to differentiate soils. Forty-nine pedons at three landform positions were compared with canonical discriminant analysis, principal component analysis, and kriging. Statistical analyses improved soil classification and allowed a clearer view of the field distribution of soil properties, compared with standard soil-survey techniques. Soils with properties indicative of strong leaching (Solods) are recognized as significantly different from other soil taxonomic components at the intermediate and wetland positions. Solods were extensive at the wetland position, but could not be differentiated from Typic Natraquolls solely by morphologic observation. Although Solods are related to other leached soils, Argiaquolls and Argialbolls, they also possess soil properties that are similar to associated sodic soils. Leptic Natriborolls and Udic Natriborolls were similar except for salinity. The salinity difference by itself does not produce significant statistical differentiation between the soils of the two natric subgroüps. High salinity would be better recognized as a soil-series phase, not a separate subgroup of Natriborolls.

Contribution of North Dakota Agric. Exp. Stn.

Received for publication October 9, 1990.

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