Substratos renováveis na produção de mudas de Eucalyptus Benthamii Maiden et Cambage e Mimosa Scabrella Benth.
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Eucalipto - Mudas
Bracatinga - Mudas
Based on the importance of substrate on seedling production and use of renewable materials for its formulation in this study aimed to evaluate the technical feasibility of using renewable substrates the base of coconut fiber, rice hulls, sewage sludge and pine bark medium decomposed for the production of Eucalyptus benthamii and Mimosa scabrella and also relate the physical and chemical characteristics of substrates formulated with quality seedlings. For that we gave 41 treatments, performed physical and chemical analysis of them. The experiments were conducted at the Laboratory Propagation of Plants Embrapa Florestas located in Colombo-PR, performing direct owing in tubes of 55 cm ³ staying for 60 and 120 days in a greenhouse of glass for Eucalyptus benthamii and Mimosa scabrella, respectively, and 30 days in the area of full sun for both species. The experiment was a completely randomized design with 41 treatments of 5 replicates wi th 20 plants. Every 30 days were carried out measurements of height and diameter and the final evaluation was quantified fresh and dry biomass and root air, ease of removal of the tube, root aggregation to substrate ratio shoot height and diameter and Quality Index Dickson. The collected variables were tested with Bartlett and then analysis of variance, proceeding to the Scott-Knott to observe the differences between means. Based on these results, we can observe different responses to the two species. For both species, the best substrates studied were those formulated the basis of coconut fiber / rice hulls analyzed in different proportions. Eucalyptus benthamii for all renewable components were technically feasible, while for the Mimosa scabrella the biosolids had to be unfeasible, because of its high density, organic matter content, magnesium concentration, salinity and pH were not suitable for this species. Eucalyptus benthamii to the higher aggregation in substrate, greater ease of removal of the seedlings of the tube, while for the Mimosa scabrella, observed an opposite effect. Measurements of height and diameter prior to final assessment are exempt, since they are not reliable for predicting the outcome. Eucalyptus benthamii showed lower plasticity to the substrate relative to Mimosa scabrella, which can produce the seedlings on each substrate examined.
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