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Fig. 1. Corn-derived soil organic carbon (cdSOC) as a function of source carbon (SC) produced by treatments of tillage (no-till, NT; moldboard, MB; chisel, CH), N fertilization (0 and 200 kg N ha^–1, indicated by +N data point labels), and stover management [residues harvested (h) and residues returned (r)]. The F values for regression were significant at a P < 0.01. Regression lines are dashed for NT and solid for combined MB and CH tillage treatments.