Pacheco, Mauro VasconcelosSantos, Marina Beatriz da Silva Bezerra2024-11-072024-11-072024-06-28SANTOS, Marina Beatriz da Silva Bezerra. Biochar e extrato pirolenhoso no crescimento inicial de mudas de Handroanthus impetiginosus. Orientador: Dr. Mauro Vasconcelos Pacheco. 2024. 53f. Dissertação (Mestrado em Ciências Florestais) - Escola Agrícola de Jundiaí, Universidade Federal do Rio Grande do Norte, Natal, 2024.https://repositorio.ufrn.br/handle/123456789/60569The exploration of new approaches utilizing resources from forest ecosystems is crucial for optimizing the forestry sector. In this context, this study aimed to evaluate different methods of pyroligneous extract (PE) application on the initial growth of Handroanthus impetiginosus seedlings. The investigation involved incorporating PE into the substrate in different ratios of biochar (B) + commercial substrate (S) and biochar enriched with pyroligneous extract (BP) + commercial substrate (S), specifically in ratios of 20%B + 80%S (BS20), 20%BP + 80%S (BPS20), 30%B + 70%S (BS30), and 30%BP + 70%S (BPS30). In the second trial, concentrations of 0, 0.2, 0.4, and 0.6% of PE were applied to the substrate, followed by foliar spray after seedling emergence. Seedlings were evaluated at 30, 60, 90, and 120 days after sowing, measuring height, stem diameter, and leaf number. At 120 days after sowing, seedlings were harvested, dried in an oven to determine dry mass and Dickson's quality index (DQI). Regression analysis and analysis of variance were conducted based on the collected data. Results indicated that methods of PE application influenced the initial growth of seedlings. Notably, substrate incorporation of PE resulted in inferior performance in height and the ratio of shoot dry mass to root dry mass. Conversely, applying PE after seedling emergence, either directly to the substrate or through foliar spray, significantly increased seedling height across all tested concentrations, differing only from the control treatment. Root dry mass, total dry mass, and DQI showed significant differences concerning the interaction between application method and PE concentrations. Therefore, it is concluded that while there were improvements in the morphological characteristics of the plants, the isolated use of PE does not provide conclusive recommendations for dosage. This underscores the need for further research.Acesso AbertoProdução de mudasBiocharQualidade de mudas florestaisVigorBiochar e extrato pirolenhoso no crescimento inicial de mudas de Handroanthus impetiginosusBiochar and wood vinegar in initial growth of Handroanthus impetiginosus seedlingsmasterThesisCNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL