This study aimed to evaluate the effect of different methods to break dormancy and the use of sugarcane bagasse in the composition of alternative substrates made from a mixture of commercial substrate, in canafistula (Peltophorum dubium (Sprengel) Taubert) seedling production The experiment was carried out in randomized blocks in a 4 x 5factorial design, with five substrates, Bioplant®; 75% Bioplant® + 25% sugarcane bagasse (75B+25BC); 50% Bioplant® + 50% sugarcane bagasse (50B+50BC); 25% Bioplant® + 75% sugarcane bagasse (25B+75BC), sugar cane bagasse (100%) and four methods of breaking dormancy (control, scarification with sandpaper, immersion in hot water and scarification with sulfuric acid) with three replications. The emergence index (IVE), mean emergence time (TME), emergence percentage, shoot height, diameter of the collar; shoot dry weight, root dry weight, total dry weight, the shoot height:diameter of the colla ratio and shoot height:shoot dry weight ratio; Dickson quality index, absolute growth rate and relative growth rate. The treatments of immersion in hot water and sulfuric acid scarification were responsible for the highest percentages of emergence and IVE, and the lowest TME. The use of sugarcane bagasse proved to be technically feasible in the composition of substrates 75B+25BC and 50B+50BC, where they, along with the Bioplant®, provided the highest growth rates and quality score for canafistula seedlings.
Peltophorum dubium ((Sprengel) Taubert); forest seeds; Bioplant®; sugar cane bagasse; nursery
