Uso de rejeitos de calcário para produção de tecnossolos: alternativa para disposição e possibilidade de recuperação de áreas degradadas

Abstract

The dumping of tailings generated in mining, whether in modules or in dams, can cause damage or environmental disasters. One way to reuse these tailings would be in the production of Technosols for the recovery of degraded areas. The objective of this work is to evaluate the possibility of producing Technosols from limestone residues followed by plant growth for use in recovery areas. To ensure a pH close to neutrality, a source of acidic material was added through the pyritic tailings. A source of organic matter was also added. The analysis of the substrate produced was performed through physical attributes such as granulometry, moisture and fertility parameters, through the cultivation of black oat (Avena strigosa) and ryegrass (Lolium multiflorum Lam). In the physical attributes, the granulometry influences the soil moisture. In the elemental analyses, chemical elements were present at higher levels in the Technosols with the highest percentage of tailings, compared to the control soil. All experiments performed with different percentages of tailings provided nutrients for seed germination. Technosols show potential for recovery of degraded mining areas, when mixed with soil.