Abstract
Based on 125 surface soil samples, a multiple-regression prediction equation of the form, CEC=b0+b1 (% clay) +b2 (% organic matter) was developed for Mississippi soils. These data plus data from comparable studies in Ohio, Wisconsin, North Carolina, and Florida were utilized to develop a relationship between the percentage contribution of organic matter to CEC and the clay content of the horizon. Multiple-regression equations from Mississippi, Florida, and Wisconsin studies were employed with data from Mississippi soils to determine the amount of variation between predicted and reported values of CEC. Although statistical differences were found between the three populations, the majority of these differences are within the realm of laboratory error, and it appears feasible to develop inter-regional CEC prediction equations.
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