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Fig. 2. Differences in soil organic C between tillage systems ( ${Delta}$ SOC) from experiments conducted in the Argentine Pampa Region related to experiment duration. (a) ${Delta}$ SOC calculated for fixed depth, (b) ${Delta}$ SOC calculated on an equivalent mass basis. ${Delta}$ SOC = NT – PT (solid circles) denotes SOC differences between no-till and plow till. ${Delta}$ SOC = NT – RT (open circles) denotes SOC differences between no-till and reduced till (chisel and disk till).