The objective of this work was to study the initial growth of Acacia mangium in coconut fiber "blanket" with a substrate of sewage sludge. The experimental design was of a randomized block with 13 treatments, three repetitions, in a factorial project (6 x 2 + 1), with 6 ratio of coconut fiber and aggregating residue, combined with presence and absence of sewage sludge, and treatment control (subsoil land). The speed emergency index (IVE), percentage of emergency (EM) and plant height at the 40 and 60 days after emergency was evaluate. No interaction was observed between the type of substrate used and the different ratio of coconut fiber in the "blanket". The presence of sewage sludge in the substrate did not influence the IVE and EM, however it was verified that the substrate without sewer silt provided greater growth in plant height. The use of "blankets" with 50 and 100% coconut fiber provided greater growth of the A. mangium grow in field conditions.
Sewage Sludge; Germination; Residues
