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Evaluating the Soil Vulnerability Index and Conductivity Claypan Index for Claypan Soils in Missouri

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  131620723,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131620723) @2013
Authors:   Robert E Chan, Allen L. Thompson, Claire Baffaut, E. John Sadler
Keywords:   targeting index critical management area contingency table variability.

Abstract. Targeting indices can be used by producers, land managers, or owners to improve effectiveness and efficiency of management practices. Two Indices intended to identify areas most prone to erosion were studied and compared in this study, including one index intended to be used nationally and one developed specifically for soils that have a restrictive layer. Indices were tested with two different slope sources so that 4 maps of classified areas were ultimately made. Factors affecting the critical areas identified by each index such as the variability of input parameters were assessed, and classified areas according to each index were compared to determine if they agreed or disagreed. The variables of slope and depth to claypan had the most variability and were found to be influential in determining how areas were classified in each index. When classifications between indices were compared there was a high amount of agreement, but indices had a significant amount of disagreement for the highest risk, “critical” areas. The index developed specifically for soils with a restrictive layer consistently identified more areas as being critical. Knowledge of the watershed confirmed that some of these areas have conservation needs for sustainable row crop production.

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