QUALIDADE DE MUDAS DE COPAIFERA LANGSDORFFII DESF., CULTIVADAS EM SUBSTRATOS ALTERNATIVOS, EM FUNÇÃO DE ADUBAÇÃO COMPLEMENTAR

There is a growing interest in the production of seedlings of native species for recovery of degraded areas, restoration of legal reserve and areas of permanent preservation or for use in different sectors of the economy. The objective of this study was to evaluate the quality of seedlings of Copaifera langsdorffii Desf. cultivated in an alternative substrate as a function of complementary mineral fertilization. The experiment was carried out at the Forest Nursery of the Federal University of Tocantins - UFT, Gurupi University Campus. A randomized complete block experimental design was used in a 2x12 factorial design with ten replications. They were measured at 90 days after emergence: Height of seedlings, Root length; Colo diameter; Dry mass of aerial part and root system; Leaf area; Substrate density and seedling quality index. The substrate was composed of Worm Humus (50%) and subsoil soil (50%) in the absence of fertilization provides improvement in the morphology of the seedlings as dry shoot mass, dry mass of the roots and the highest quality index of seedlings . Substrates with 75% commercial substance and 25% subsoil and 100% commercial substrate do not require fertility supplementation with fertilization to promote improvement in seed quality index. However, if the sources of commercial substrate and bark of charred rice are used, the use of fertilizer is recommended as the proportion of these organic compounds is reduced.Atualmente, é crescente o interesse na produção de mudas de espécies nativas para recuperação de áreas degradadas, recomposição de reserva legal e áreas de preservação permanente ou para o uso em diferentes setores da economia. Com isso objetivou-se avaliar a qualidade de mudas de Copaifera langsdorffii Desf. cultivada em substrato alternativo em função da adubação mineral complementar. O experimento foi desenvolvido no Viveiro Florestal da Universidade Federal do Tocantins – UFT, Campus Universitário de Gurupi. Instalou-se ensaio experimental em delineamento de blocos casualizados, em esquema fatorial de 2x12, com dez repetições. Foram mensurados aos 90 dias após a emergência: Altura das Mudas, Comprimento da Raiz; Diâmetro do Colo; Massa Seca de Parte Aérea e Sistema Radicular; Área foliar; Densidade do substrato e o Índice de Qualidade de Mudas. O substrato foi constituído por Húmus de Minhoca (50%) e terra de subsolo (50%) na ausência de adubação proporciona melhoria na morfologia das mudas quanto a massa seca da parte aérea, massa seca das raízes e o maior índice de qualidade de mudas. Os substratos com 75% de substância comercial e 25% de terra de subsolo e 100% de substrato comercial não requerem a suplementação da fertilidade com adubação para promover a melhoria no índice de qualidade de mudas. No entanto, se forem utilizadas as fontes de substrato comercial e casca de arroz carbonizada, recomenda-se o uso de adubação à medida em que forem diminuindo a proporção desses compostos orgânicos

Quality of seedlings of Copaifera langsdorffii Desf Cultivated in Alternative Substrates According to the Source and Methods of Application of Humic Acids

The objective of this study was to evaluate the effect of humic acid application methods on an alternative organic substrate in the quality of seedlings of Copaifera langsdorffii Desf. The experiment was carried out in a nursery of production of forest seedlings under cover of the dark type with 50% of luminosity retention, located in the municipality of Dianópolis state of Tocantins, in geographical coordinates, 11° 37′ 41″ S of latitude, 46° 49′ 17″ W of longitude, with altitude of 702 meters. The results revealed that the use of the commercial humic acid source applied via foliar promotes a higher quality of seedlings in relation to the alternative source and the absence of application of humic acids