Viabilidade técnica do uso de topsoil na composição de susbstratos de espécies florestais da caatinga

• Ano de defesa: 2023
• Autor(a) principal: Andrade, Adriano Alves de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Brasil; Campus Marechal Deodoro; Mestrado Profissional em Tecnologias Ambientais/PPGTEC
• Palavras-chave em Português: Enterolobium contorstisiliquum.; Peltophorum dubium; Tabebuia roseoalba.; Abarema langsdorfii; Caatinga; CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL
• Link de acesso: https://repositorio.ifal.edu.br/handle/123456789/812

Mining is one of the basic sectors of the country's economy. However, it generates large environmental impacts, as well as a large amount of waste. To comply with environmental legislation, the enterprise must present programs for the recovery of degraded areas. The production of seedlings is one of the actions performed, which requires a large volume of substrates, usually commercial, of high cost. The topsoil, the surface layer of the soil, is a residue with physicochemical characteristics with potential for agricultural use, present in large quantities, reaching 33 thousand m3. Therefore, the objective of this research was to know the technical feasibility of topsoil added to commercial substrate for the production of seedlings of four native species of the Caatinga. The experiment was completely randomized in a 5 x 4 factorial scheme, with five levels of topsoil (0, 25, 50, 75 and 100% of topsoil replacing the commercial substrate) and four species of Caatinga timbaúba (Enterolobium contorstisiliquum), canafístula (Peltophorum dubium), dry flour (Abarema langsdorfii) and white ipê (Tabebuia roseo-alba). Biometric variables were evaluated to determine the quality of the seedling. Considering the number of leaves, there was no interaction between the factors, in which the species timbaúba (8.0) and ipê branco (8.5) had higher averages, being able to use 100% topsoil. For the diameter of the stem, 13.9 and 10.3% topsoil are the maximum limits for canafistula and dry flour. For the height of the plant, 85.4% topsoil is recommended for Timbaúba. Considering the Dickson quality index, for the canafístula and ipê branco species, 74.1 and 36.1% are the maximum limits of topsoil and, for dry flour and timbaúba, up to 100% can be used. Thus, it will be possible to reduce costs up to 77% in the production of forest seedlings.