Influência de bentonitas no ponto de carga zero (PCZ) e grau de floculação em um regossolo distrófico.

Abstract

An experiment was carried out in order to study the effect of bentonites on the Zero Point of Charge and degree of floculation of a dystrophic rhegosol. The treatments were four levels of bentonites equivalent to 0, 30, 60 e 90 t/ha. The samples of soil from zero to 20 cm depth were incubated with bentonites for a period of 120 days The degree of floculation was determined and the PCZ was estimated for all treatments. The results showed that the use of the bentonites Bravo and Primavera, decreased and increased the pH corresponding to the ZPC, respectively. The bentonites affected the degree of floculation by increased it.