PLANT RESIDUES AS AN ALTERNATIVE FOR SUBSTRATE COMPOSITION IN THE PRODUCTION OF Eucalyptus grandis SEEDLINGS

Selecting constituents for substrate formulations is of fundamental importance for the production of quality seedlings. The objective of this work was to evaluate the initial growth of Eucalyptus grandis seedlings, using carbonized and fresh coffee husks, cattle manure, coconut fiber and carbonized rice husks as substrate constituents, in different combinations. As a control treatment, the commercial substrate Maxfértil was used. The experiment was set in a nursery, in a randomized block design, consisting of eight treatments and four replications, with a sample unit of 16 seedlings. To evaluate the quality of the seedlings formed, the biometric variables, and plant biomass were quantified and the characterization of the physical and chemical properties of the formulated substrates was also carried out, regarding the characteristics of the seedlings produced. Qualitative analyses were used, where the ease of removing the seedlings from the tube and the aggregation of the roots to the substrate were assessed. After data analysis, it was found that the use of coffee husks was adequate for the production of Eucalyptus grandis seedlings for most of the analyzed variables, with higher values than the seedlings formed in the control treatment. Thus, coffee husks are indicated as an alternative constituent of substrates for the production of seedlings of the referred specie

SEEDLINGS OF TREE SPECIES PRODUCED IN SUBSTRATES BASED ON ORGANIC COMPOSTS

The quality of the seedling produced is directly related to substrate composition, so it is essential to select constituents with adequate characteristics. The objective of this study was to evaluate Eucalyptus urophylla, Peltophorum dubium and Eremanthus erythropappus seedlings and to relate the physical and chemical characteristics of the formulated substrates to their quality. For each species, an experiment was carried out in a completely randomized design (CRD), consisting of five treatments, five replicates, and plots composed of 20 seedlings. In order to evaluate the quality of the seedlings, the biometric variables were measured and, as a qualitative analysis, the ease to remove the seedlings from the tubes (ERT) and root aggregation to the substrate (AGGR) were evaluated. Seedlings produced in the substrates formulated with alternative constituents showed higher values when compared to seedlings produced with commercial substrate, for most of the analyzed variables. Coffee husk can be applied in the production of seedlings of P. dubium and E. urophylla. For the formation of E. erythropappus seedlings, none of the formulations tested are recommended

Potencial uso da casca de café como constituinte de substrato para produção de mudas de espécies florestais

In the production of forest species seedlings there are several factors that influence their growth. Among these, one of the most important is the composition of the substrate. In this sense, it is essential to select good constituents that meet this demand. The objective of this work was to evaluate the initial growth of seedlings of Eucalyptus urophylla, Peltophorum dubium and Eremanthus erythropappus, produced in different substrate formulations. For each species, an experiment was installed and conducted, using composted rice husk, composted coffee husk, coconut fiber and commercial substrate in the formulations. The experiments were installed in a completely randomized design (DIC), consisting of eight treatments, five replications and 20 seedlings per plot. To evaluate the quality of seedlings, at 120 days the variables height, stem diameter, dry matter weight of the aerial part, dry matter weight of the root system and Dickson's quality index were measured. As qualitative analyzes, the ease of removing seedlings from the tube and the aggregation of roots to the substrate were evaluated. The results found after the evaluation attested that the seedlings produced in the treatments formulated with composted coffee husk presented higher values for most of the analyzed variables, when compared with the seedlings produced in the treatments formulated with the rice husk and in the control. For the three species, the use of the proportion of 40% of coffee husk composted with 40% of commercial substrate and 20% of coconut fiber for the composition of the substrate is indicated.Na produção de mudas de espécies florestais há vários fatores que influenciam no seu crescimento. Dentre estes, um dos mais importantes é a composição do substrato. Nesse sentido, é essencial a seleção de bons constituintes que atendam a essa demanda. O objetivo deste trabalho foi avaliar o crescimento inicial de mudas de Eucalyptus urophylla, Peltophorum dubium e Eremanthus erythropappus, produzidas em diferentes formulações de substratos. Para cada espécie, foi instalado e conduzido um experimento, utilizando-se nas formulações os constituintes casca de arroz compostada, casca de café compostada, fibra de coco e substrato comercial. Os experimentos foram instalados em delineamento inteiramente casualizado (DIC), constituídos por oito tratamentos, cinco repetições e 20 mudas por parcela. Para avaliação da qualidade das mudas, aos 120 dias foram mensuradas as variáveis altura, diâmetro do coleto, peso de matéria seca da parte aérea, peso de matéria seca do sistema radicular e índice de qualidade de Dickson. Como análises qualitativas, foram avaliadas a facilidade de retirada das mudas do tubete e a agregação das raízes ao substrato. Os resultados encontrados após a avaliação atestaram que as mudas produzidas nos tratamentos formulados com casca de café compostada apresentaram valores superiores para a maioria das variáveis analisadas, quando comparado com as mudas produzidas nos tratamentos formulados com a casca de arroz e na testemunha. Para as três espécies, indica-se a utilização da proporção de 40% de casca de café compostada com 40% de substrato comercial e 20% de fibra de coco para composição do substrato