The best result in soil pH (pH 6.9) was observed when sulfur wasapplied at a rate of 3.2 t ha−1, in a mixing proportion (S*:G) equiv-alent to 100:0. The effects on exchangeable Na+revealed a greatreduction when higher levels of gypsum (G) and sulfur inocu-lated with Acidithiobacillus bacteria (S*) were applied. When S*and G were applied in the mixing proportions (S*: G) equivalent to25:75 and 0:100, the best values of soil exchangeable Na+(8.9 and9.0 cmolcdm−3) were obtained. Some results of the exchangeableNa+after soil amendment were found to be below 15 (cmolcdm−3),and Na+in these concentrations do not promote injurious problemsin tolerant plants.The soil electrical conductivity