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Soil organic C (SOC) and total N (TN) contents play a crucial role in sustaining agricultural production systems. Short-term (≤10-year) management effects on SOC and TN dynamics are often complex and variable. Three experiments were conducted to evaluate short-term tillage and cropping system effects on SOC and TN within the 0–30 cm soil depth across Iowa. The first experiment with no-tillage and chisel plowing treatments was established in 1994 on Clarion-Nicollet-Webster (CNW), Galva-Primghar-Sac (GPS), Kenyon-Floyd-Clyde (KFC), Marshall (M), and Otley-Mahaska-Taintor (OMT) soil associations under a corn (Zea mays L.)–soybean (Glycine max (L.) Merr.) rotation. The second experiment with no-tillage, strip-tillage,...