Efeito da adubação no pH, massa específica básica e teor de cinzas da madeira de Cordia trichotoma (Vell.) Arrab.ex Steud

Abstract

Wood is a multi-purpose material, and can be used for furniture, structures, panels, energy, among others, however, its properties are variable according to certain factors, such as environment, species, soil. The basic specific mass, pH, ash content, buffering capacity are some points that can help in determining the appropriate use for each species. Cordia trichotoma is a native species, found from Ceará to Rio Grande do Sul, with good workability and ideal for use in baseboards, furniture.The work was carried out at the Federal Technological University of Paraná, Dois Vizinhos campus, at the Wood Technology Laboratory, where disks of 12 trees of the Cordia trichotoma species were obtained, supplied after selective thinning carried out in the planting located in the Experimental Station of UTFPR itself, being within these 12 wood disc samples, 3 for each type of treatment, varying in T0 (without fertilization), and the other 3 with different doses of NPK, being, T1 (33-22-09), T2 (66 -44- 18) and T3 (99-66-27). The disks were cut into 4 wedges, 2 wedges being used for the analysis of the basic specific mass and the other two for the analysis of pH, buffering capacity and ash content. After carrying out the analyses, the data obtained were submitted to analysis of variance, and Tukey's test at 5% probability for comparison between means using the SASM – Agri software. The basic specific mass varied from 0,37 to 0,40 g/cm³, pH after 1 hr from 6,53 to 6,79, pH after 24 hrs from 6,47 to 6,73, buffer capacity between 2,45 and 5,52 ml of NaOH solution (0,001 N) and ash content from 1,04 to 2,03%. Analyzing statistically, the treatments did not show significant difference between them, with all p-value > 0,05.