This paper reports the results obtained in an experiment on mineral fertilization for soybeans carried out to study crop responses and residual effect, with and without limestone. The trial was carried out at the Estação Experimental "Dr. Theodureto de Camargo", Campinas in a plot of "terra-roxa-misturada". All results refer to the period 1955/56 to 1957/58. Phosphorus induced the greatest yield response (49 % over the control) with significant differences. In presence of limestone, phosphorus showed 21 % increase over phosphorus with no limestone. Nitrogen and potash induced no significant responses. Residual effects were noted only for phosphorus and limestone in 1958/59, as a result from previous application. However, the results were not statistically significant for limestone. The results reported in this paper agree with those on which it is based the usual recomendation that mineral fertilizers for the soybean should preferably be applied to the crops that preceed this plant in a rotation program.