ABSTRACT
This study was carried out from 1995 to 1996 at the the Laboratory of Irrigation and Salinity of the Department of Agricultural Engineering of the CCT/UFPB. The effects of the Primavera bentonite, from Boa Vista municipality, Paraíba state on the soil chemical properties, were evaluated in samples of a eutrophic rhegosol. Such soil samples of 0 - 20 cm depth were incubated for 120 days with doses of bentonite equivalent to 0, 30, 60 and 90t ha-1. After that, the chemical alterations were evaluated in the samples of the soil . The bentonite did not influence the levels of the exchangeable K and Al and available P, but increased soil pH and exchangeable Ca, Mg, Na and CEC. The results showed that the use of the bentonite Primavera increased the pH corresponding to the soil's ZPC.
Key words:
bentonite; eutrophic rhegosol; chemical properties