Fig. 6. Liquid limit, plastic limit, and plasticity index as a function of soil organic carbon (SOC) concentration for the (A) 0- to-10-cm and (B) 10- to-20-cm soil depths across five long-term management practices at the Northern Appalachian Experimental Watershed in Coshocton County, OH. The r² were all significant at the 0.001 probability level.