Twenty soil samples were incubated with pure calcium carbonate at the rates of 0-2-4-6 and 8 tons per hectare, giving a total of 100 samples. These 100 samples were analyzed for pH, exchangeable calcium, magnesium, potassium and aluminum, hydrogen extracted with 1 N calcium acetate solution pH = 7.0, etc. Four rapid laboratory methods for lime requirement were applied to the incubated samples in order to establish relationships between them. The lime requirement as measured by the acidity extracted by 1 N calcium acetate solution, by the SMP method and by the base saturation-pH curves (85% base saturation) showed to be correlated with the lime requirement to pH 6.5 by incubation (r = 0.92; r = -0.90 and r = 0.96, respectivelly). The lime requirement as measured by the acidity extracted by 1 N KCl solution (exchangeable aluminum) related to the lime requirement to pH = 5.7, by incubation, presented a correlation coefficient 0.72.