Substratos renováveis na produção de mudas de Eucalyptus grand

• Ano de defesa: 2012
• Autor(a) principal: Peroni, Leonardo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal do Espírito Santo; BR; Mestrado em Ciências Florestais; Centro de Ciências Agrárias e Engenharias; UFES; Programa de Pós-Graduação em Ciências Florestais
• Palavras-chave em Português: Sewage sludge; Coconut fiber; Coffee straw; Rice hulls; Organic compost; Lodo de esgoto; Fibra de coco; Palha de café; Casca de arroz; Composto orgânico; Lodo residual; Eucalyptus grandis - Nutrição; Química vegetal; Viveiros florestais; Mudas - Qualidade; Recursos Florestais e Engenharia Florestal; 630
• Link de acesso: http://repositorio.ufes.br/handle/10/5823

This study aimed to test the use of sewage sludge and renewable organic waste in the composition of substrates for the production of Eucalyptus grandis W. Hill ex Maiden seedlings. The seedlings were grown in the Forest Nursery of the of Forest and Wood Department of the Agricultural Sciences Center from the Federal University of Espírito Santo, in the municipality of Alegre, in tubes with a capacity of 280 cm3, containing different combinations of substrates. After 90 days, the morphological and nutritional characteristics were evaluated. The used substrates were made from different combinations of sewage sludge with renewable vegetable waste such as coconut fiber, fresh coffee straw, organic compost (manure + fresh coffee straw) and fresh rice husk, in proportions of 100:0, 80:20, 60:40, 40:60 and 20:80 (sewage sludge : crop residues), and a control, consisting of a commercial substrate, totaling 18 treatments with six replicates of four plants each. Physical analysis of all the formulated substrates demonstrated that they showed low density, with a tendency to increase according to the rise of sewage sludge proportions in their composition. It was observed in the treatments containing higher proportions of sludge an increased porosity. There was a reduction of macroporosity values in treatments containing over 60% of coconut fiber and over 40% of fresh rice husk in the substrates composition. Most treatments showed appropriate microporosity, and in general, the microporosity corresponded to a higher percentage of porosity distribution in all treatments. The treatments composed of waste such as fresh coffee straw and fresh rice husks allowed a greater drain to the substrate, which provided more room for airing and a lower amount of water easily available. Chemical analysis of substrates revealed a low pH, between 4.0 and 5.7, for all treatments and adequate CTC for most of them. The use of increasing proportions of coconut fiber, fresh rice husk and fresh coffee straw promoted additions of K to the substrate and reduction of the Ca available. The use of growing proportions of sewage sludge promoted an increase of the total content of soluble salts of the substrate. The treatments containing organic compound in the composition provided the best developments of the seedlings morphological characteristics. Most treatments had proper foliar levels of N, Ca, S, Mn and B, high levels of P and Cu and low concentrations of K, Mg, Fe and Zn. The combination of renewable vegetable organic waste and sewage sludge provided significant differences in terms of seedling growth, compared to the commercial substrate commonly used, demonstrating the importance of evaluating the potential of each residue as a component of the substrate before employing it commercially, since some materials may provide a less impressive seedling development