The present paper deals with fertility tests carried out with soil samples from the Pindamonhangaba Agric. Exp. Sta., one of the branch stations of the Instituto Agronômico. The samples were collected from four soil series: Pinda, Pinhão, Guatemala, and Prateada. The test plants (romaine lettuce) were grown in aluminum pots containing 1.5 kg of soil. The following fertilizer were used: nitrocalcium, superphosphate, and sulfate of potash. The soil acidity was corrected with lime (dolomitic type). Six weeks after planting the lettuce plants were harvested being cut at soil level, dried at 60°C, and weighed. The results obtained suggest the following recommendations for future field experiments: Pinda series: lime had a marked influence on the growth of the plants. The following basic formula is recommended: N1P1K2. Pinhão series: the use of lime did not promote any response. The following basic formula is indicated: N1P3K1. Guatemala series: there was a striking response to liming. The formula N1P3K1 was the best. Prateada series: in addition to the use of lime (results rather significant) the following basic formula is recommended: N1P2K1.