Production of jatoba seedlings in residual substrates

This study evaluated the production of Hymenaea courbaril L. (jatobá) seedlings using substrates composed of agroindustrial residues, aiming to improve morphological and physiological attributes of seedlings for reforestation. The experiment was conducted at the FUNTAC nursery in Rio Branco (AC), using a randomized block design with four blocks and five plants per block. Treatments were: T2 (açaí seeds + coffee husk), T3 (T2 + bone meal), T4 (organic compost from UTRE), T5 (T4 + bone meal), T6 (sawdust), T7 (T6 + bone meal), T8 (T6 + bovine ruminal residue), and T9 (T8 + bone meal). Seeds were sown in 120 cm³ tubes with slow-release fertilizer. Height and collar diameter were evaluated at 30, 60, 90, and 120 days, along with fresh and dry mass of aerial and root parts, Dickson Quality Index (DQI), and soil aggregate consistency. Treatment T9 showed the best results: average height of 34.34 cm, diameter of 4.32 mm, fresh mass of 6.22 g, dry mass of 3.28 g, DQI of 0.29, and soil consistency score of 7.0, with higher levels of Cu, Fe, Mn, and Zn. However, T4 presented the highest DQI (0.72). Results indicate that substrates with agroindustrial residues, especially enriched with bone meal, are a viable, sustainable, and economical alternative for jatobá seedling production, supporting reforestation and environmental recovery efforts.