Caracterização físico-química comparativa entre pós de rochas granodioríticas e basálticas como potenciais fertilizantes agrícolas

Abstract

This work proposed a study of the physical and chemical characteristics of the rock powder from the gravel extraction of granodioritic composition from a quarry located in the municipality of Pelotas/RS, compared with the rock powder from gravel extraction of basaltic composition from a quarry located in the municipality of Montenegro/RS, trying to understand the possibilities of application for these materials as agricultural fertilizer. Therefore, physical and chemical tests were carried out to characterize the composition of the products according to granulometry, insoluble solids, macronutrient and micronutrient contents, toxic elements, iron, cadmium and aluminum contents, neutralization power, pH, conductivity and density, which resulted in outcomes like neutralization power greater than ninety-six percent of these materials, its average contents related to remineralizing and nutritive elements to the soil higher than nine percent, which is the minimum value stipulated by the federal government, in addition to its adequate granulometry, that legitimize, in general, the use of both rock powders, depending on the specific demands of users, as excellent fertilizers and soil correctors, if used consistently over the long term - meaning investment and good treatment of the soil - due to their capacity to be milled into particles of ideal size, their high neutralizing power or due to the observance of appropriate and interesting values of nutritive chemical elements, enriching the earth.