An experiment was conducted on an acid soil at Campinas, State of São Paulo, to study the effects, on the yield of soybeans, of hydrated lime and dolomitic limestone broadcast or sideplaced, the entire doses being applied in the first year or portionswise over two or three years. The average increase through liming corresponded to 59%, but the differences between the two liming materials, as well as those shown by the methods of application were small. The direct effect of the entire doses applied in the first year was smaller than the residual effect.