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DIVISION S-5—PEDOLOGY

Equations for Predicting Soil Organic Carbon Using Loss-on-Ignition for North Central U.S. Soils

^a Dep. of Geography, Northern Illinois Univ., DeKalb, IL 60115
^b Dep. of Geography and Geology, Univ. of Wisconsin, Whitewater, WI 53190
^c Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
^d Conservation and Survey Div. and Dep. of Geosciences, Univ. of Nebraska, Lincoln, NE 68588

* Corresponding author (konen{at}geog.niu.edu)

Samples of 255 noncalcareous A, Ap, and AB horizons from selected major land resource areas (MLRA) in the north central USA were used to develop equations for predicting organic C content, as determined with a Leco C analyzer, from weight loss-on-ignition (LOI). Organic C concentrations of the samples ranged from 1.09 to 114.6 g kg^-1. Within each MLRA, strong linear relationships were observed between LOI and organic C measured by the Leco instrument, with r² ranging from 0.94 to 0.98. Predictive equations developed by least-squares regression were significantly different for individual MLRA's. Loss-on-ignition is a rapid, inexpensive, and accurate method for estimating organic C concentration in soils of the north central USA. We recommend that unique predictive equations be developed for individual soil-geographic regions.

Abbreviations: LOI, loss-on-ignition • MLRA, major land resource area • SOC, soil organic C • SOM, soil organic matter

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