Soil texture analysis revisited: Removal of organic matter matters more than ever

by Johannes Lund Jensen, Per Schjønning, Christopher W. Watts, Bent T. Christensen, Lars J. Munkholm

Exact estimates of soil clay (2O₂ before soil dispersion and determination of clay and silt. Soil samples with gradients in SOM were retrieved from three long-term field experiments each with uniform soil mineralogy and texture. For soils with less than 2 g C 100 g^-1 minerals, clay estimates were little affected by SOM. Above this threshold, underestimation of clay increased dramatically with increasing SOM content. Silt contents were systematically overestimated when SOM was not removed; no lower SOM threshold was found for silt, but the overestimation was more pronounced for finer textured soils. When exact estimates of soil particles

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