Qualidade de mudas de eucalipto e acácia em substratos de resíduos agroindustriais

• Autor(a) principal: Jesus, Roberta Paula de
• Data de Publicação: 2016
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/8363
• topic: Produção de mudas; Essências florestais; Fibra de coco; Lodo compostado; Seedling production; Forest species; Coconut fiber; Composted sludge; FISIOLOGIA VEGETAL::REPRODUCAO VEGETAL

Demand for quality seedlings of forest species is becoming increasingly widespread, due to increased planted area and the restoration of degraded environments. Based on the importance of substrate for seedling production and use of renewable materials in its formulation, the aim of this work was to characterize the physical properties of renewable substrates composed by coconut fiber and composted sludge and evaluate the feasibility of using these substrates in the production of seedlings of Eucalyptus grandis and Acacia mangium. Therefore, there were three studies. The sources of organic materials used for the composition of the substrates were commercial substrate, coconut fiber and composted sludge (waste from the tomato processing industry). The treatments were: commercial substrate; commercial substrate + 10% sludge; commercial substrate + 20% sludge; commercial substrate + 40% sludge; coconut fiber; Coconut fiber + 10% sludge; coconut fiber + 20% sludge and coconut fiber + 40% sludge. In the first study were performed following physical analysis of formulated substrates: volume density, particle density, porosity, air space, readily available water, buffering water, available water, the remaining water of 100 cm and water retention capacity. It was observed that treatments showed a great variability in the physical characteristics and no advantage in doing mixtures to obtain a more efficient substrate on these properties. As a conditioner of the mixes, the composted sludge promoted increased density, reduced porosity and increased water retention capacity. In the second study, parameters relating to the growth of Eucalyptus grandis seedlings were evaluated, and the third study evaluated parameters relating to the growth of Acacia mangium seedlings. The evaluated parameters were: plant height, stem diameter, dry matter of aerial part and radicial part, ease of removal of the cartridge seedlings, roots aggregation of the substrate and chemical analysis of the aerial part of the plant. The results showed that the use of sludge and composted coconut fiber as substrate for the production of Eucalyptus grandis and Acacia mangium seedlings is a promising alternative because it resulted in the adequate development of the same. The use of organic waste in the substrate composition for the production of forest trees seedlings is a technically feasible option and is an alternative to recycling and use of by-products of agribusiness.