Equations for predicting soil organic carbon using loss-on-ignition for north central U.S. soils
2002
Konen, M.E. | Jacobs, P.M. | Burras, C.L. | Talaga, B.J. | Mason, J.A.
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.
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