Lime requirement diagnostic by base saturation (H + Al) estimation methods are critical in CEC calculation since they are bound to a potential soil acidity of pH 7.0. This study was carried out in order to evaluate a relation between the H + Al obtained by direct soil incubation with calcium carbonate and the estimation by the extractors acetate salt and SMP index. Twelve south Brazilian soils, incubated with increasing calcium carbonate rates to establish the real soil acidity at […]

The determination of the cation exchange capacity (CEC) and the relative fractions occupied by the most common cations is crucial for soil chemical characterization and soil fertility diagnostic. These variables and the exchangeable Al3+, Ca2+ and Mg2+ concentrations have been determined in the routine soil analysis by official laboratories in the States of Rio Grande do Sul and Santa Catarina since 1994. The relationship between the SMP index and the H + Al value (potential acidity) was studied in order to establish […]