Ateleia glazioveana Baill. is a pioneer, rustic and can be used for forest recovery. This work aimed to study the process of physiological maturation of this species. The research was carried out in the city of Alegre - ES, the trees were identified in the floral anthesis and accompanied during the filling of the fruits and development of the seeds until the complete maturation. The fruits were harvested at the following stages 7, 14, 21, 28, 35 and 42 days after anthesis, and characterized according to: morphometry, moisture, fresh and dry mass of fruits and seeds, germination, germination speed index, shoot and root length and dry mass of seedlings. The regression equations were adjusted for the main characteristics analyzed as a function of the harvest period. The point of physiological maturity of timbó occurred at 42 days after anthesis.

Nutrient removal through timber harvesting can affect the long-term sustainability of forest plantations, particularly when species differ in biomass allocation and nutrient use. Understanding these differences is therefore essential for developing species-specific nutrient management strategies. This study evaluated differences in stem biomass allocation, nutrient and carbon stocks, and nutrient use efficiency (NUE) among 8.6-year-old Khaya grandifoliola, K. ivorensis, and K. senegalensis. This study was conducted in a plantation located at Reserva Natural Vale, Brazil, where five trees per species were sampled. Discs collected from the base, middle, and top of the commercial stem were separated into stemwood and stembark for chemical analyses. Biomass, nutrient and carbon stocks, and NUE were estimated, and differences among species were assessed using univariate and multivariate analyses. Macronutrient concentrations in the stembark followed the order Ca > N > K > Mg > S > P. K. senegalensis had the highest proportion of stembark (24.13%) and accumulated greater stocks of several nutrients and carbon in this compartment, as well as higher N, P, and Mg stocks in stemwood. In contrast, K. ivorensis showed the highest K and Fe stocks in stemwood, whereas K. grandifoliola accumulated the greatest amount of Ca. Stemwood carbon stocks averaged 11.77 Mg ha⁻¹ and did not differ among species. Nutrient use efficiency also differed among species, with K. ivorensis showing greater efficiency for N, Ca, Mg, and Cu, K. grandifoliola for K, Zn, and Mn, and K. senegalensis for Fe. The results revealed species-specific patterns of biomass allocation, nutrient accumulation, and nutrient use efficiency. K. senegalensis, which had the highest proportion of stembark, also accumulated greater stocks of several nutrients and carbon in this compartment, highlighting the potential value of retaining bark after harvesting to support nutrient return to the soil. However, the species-specific patterns of nutrient accumulation indicate that the implications for nutrient export depend on the element considered. These findings can inform species selection and harvesting practices aimed at improving nutrient conservation in Khaya spp. plantations.