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No presente trabalho são relatados os resultados de um ensaio com soja (Glycine max (L.) Merril) instalado com a finalidade de estudar, em caráter preliminar, as reações da cultura aos tratamentos com adubos químicos, na presença e na ausência de calcário e o efeito residual dos fertilizantes. O ensaio foi conduzido em Campinas, na Estação Experimental "Dr. Theodureto de Camargo", do Instituto Agronômico, numa gleba de terra-roxa-misturada, e os resultados obtidos de três anos de experiência mostraram forte reação à aplicação de fósforo e à calagem. O fósforo e o calcário proporcionaram ainda efeito residual no ano agrícola 1958/59, como resultado da aplicação no ano anterior. Os resultodos obtidos confirmam a recomendação generalizada de efetuar, de preferência, a adubação mineral nas culturas anuais que precedem a soja num programa de rotação. 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

Adubação da soja: I - Ensaios preliminares de adubação mineral em terra-roxa-misturada