CRESCIMENTO INICIAL DE AROEIRA DO SERT?O (Myracrodruon urundeuva Allem?o) EM DIFERENTES SUBSTRATOS

摘要

This study aimed to evaluate the growth of M. urundeuva Allem?o produced on substrates prepared with sewage sludge, organic compost and cattle manure. The experiment was conducted under greenhouse conditions during 120 days in the Nursery Reference Center for Nature Conservation and Recovery of Degraded Areas - CRAD, Brasília-DF. Four types of fertilizers were tested: (1) Osmocote?, (2) cattle manure, (3) organic compost and (4) dried sewage sludge. Each fertilizer was subjected to three different compositions: (1) 25%, (2) 50% and (3) 75 %, except for control and Osmocote?, totaling eleven treatments with ten replicates each. The variables analyzed were: Root collar diameter (RCD); Seedling height (H), Number of leaves (NL); Fresh Matter of shoot (FMAP); Dried Matter of shoot (DMAP); Fresh Matter of Root (FMR), Dried Matter of Root (DMR); Dickson Quality Index (DQI). The averages were compared by Tukey test at 5 % probability. The results indicated a significant interaction between treatments. The highest averages were obtained from treatments with cattle manure, followed by treatment with organic compost. The plants produced only with Osmocote? and sewage sludge died. The study pointed out the importance of incorporating organic matter in the substrate for growing seedlings of M. urundeuva and the organic compost in a proportion of 25% is equivalent to the cattle manure in the proportion of 25, 50 and 75%.