The valorization of wood derived from thinning operations in tropical plantations represents an alternative to enhance the sustainability and profitability of forest production systems. This study evaluated the hygroscopic, physical, and machining properties of 13-year-old Simarouba amara Aubl. thinning wood obtained from a plantation established in the Peruvian Amazon. Two planting spacings (2 × 2 m and 3 × 3 m) and three longitudinal stem positions (base, middle, and apex) were analyzed using a factorial design and generalized linear mixed models. Planting density and longitudinal position significantly influenced (p < 0.05) most of the evaluated properties. The saturated moisture content increased from 96.17% at the base to 135.42% at the apex, whereas basic density decreased from 0.45 to 0.30 g cm⁻³. Volumetric shrinkage ranged from 10.19% to 14.81%, and the dimensional stability index varied between 1.66 and 1.91. The first principal component (PC1) explained 98.4% of the total variance and clearly differentiated the treatments. The wood exhibited excellent performance in planing and molding, good performance in drilling, and fair performance in turning, indicating strong potential for the manufacture of higher value-added products and for sustainable utilization in tropical plantation forests.

Forest plantations represent an alternative to reduce timber extraction pressure in the Amazonian forests. In order to tolerate the hostile field conditions of deforested areas, high-quality seedlings are required. This study aimed to find the optimal dose of a native microbial consortium (NMC), which enhances seedling quality indicators, in three forest species at nursery phase. A completely randomized design (3 × 5) was used. Factor 1: Bolaina blanca (Guazuma crinita Mart.), Capirona (Calycophyllum spruceanum Benth. Hook. f.), and Marupa (Simarouba amara Aubl.). Factor 2: Incremental doses of 0, 160, 320, 480, and 640 mL NMC per plant. The nursery survival (%), robustness index, root height/length ratio, shoot–root index, Dickson Quality Index (DQI), Nitrogen (%), Phosphorus (%), and Potassium (%) content in tissues were analyzed. Statistical analyses consisted of two-way ANOVA per variable and correlation analysis. The results indicated that increasing doses of NMC did not improve nursery survival for any species; did not decrease the robustness index, plant height/root length ratio, or the shoot–root index for any species; and did not increase the DQI, P%, or K% for any species; however, they did increase the N% for all species. In conclusion, the incremental dose of 160 mL was chosen for increasing the N% without affecting nursery survival.