Comparison of organic matter content with soil color for silt loam soils of Indiana

Using data from the Purdue University soil characterization laboratory and soil descriptions made by field soil scientists, we have developed a semi‐quantitative relationship between organic matter content and soil color for cultivated, silt loam soils of Indiana. This relationship is correct for about 90% of the samples examined and divides them in three categories: < 3%, 3–5%,, and > 5% organic matter. This is not a replacement for chemical analysis but a tool that could be of use when examining problems in the field. Journal paper No. 7606, Purdue University Agricultural Experiment Station.