Metodologias de mensuração de área foliar e crescimento inicial de mudas de Copaifera langsdorffii Desf sob diferentes disponibilidades luminosas

Abstract

Information on plant growth in response to light is essential for the production of quality seedlings. Thus, the objective of this work was to evaluate the effect of different light availability on the initial growth of Copaifera langsdorffi Desf and to compare two methodologies for evaluation of leaf area of plants. For this, the seedlings were separated into three light conditions: 30%, 70% and 100% and evaluated at 0, 45, 90 and 135 days. The analyzed characteristics were: fresh and dry mass of leaves, plant height, SPAD index and leaf area that were used the two method: Leaf disc method and leaf area integrator method. The experiment was conducted in a completely randomized design (DIC), in a factorial scheme of 3 light availability (30%, 70% and 100% - full sun) x 4 evaluation periods (0, 45, 90, 135 days after transfer of the seedlings for the different light conditions) with 4 replicates in each treatment. The leaf area of the seedlings under 30% light was higher, as well as fresh mass and leaf dry mass, allowing to conclude that Copaifera langsdorffi Desf develops adjustment to survive in different light intensities. Regarding the methods of leaf area estimation, both the leaf area integrator method and the fresh mass method of leaf discs are efficient for Copaifera langsdorffi Desf.