The experiment as reported in this paper had the purpose to study the effects of the manners in which to apply clay to the soil in order to correct its acidity. During about two years this test has been continued in soils of the series Pinda, at the Experiment Station of the Departamento da Produção Animal, in the Pindamonhangaba county. The clay was applied before plowing, before the first harrowing and before the second harrowing, or parcelled, that is, half before plowing and half before the second harrowing.