Produção de mudas de ipê-amarelo submetida a diferentes regimes hídricos

Abstract

One of the biggest problems involving forestry is the availability of water resources available for irrigation of plantations, which despite the investments used to solve this problem, there are still limits that irrigation imposes, with prices in current systems and hand of work, where it must be specialized. Knowledge in forestry about scarcity-tolerant species and their water regime is extremely important for success in the activity. Aiming to evaluate the physiological and biochemical behavior of ipê-amarelo subjected to different water regimes. This work was carried out in the greenhouse of the Production Technology Laboratory, belonging to the Engineering and Agricultural Sciences Campus of the Federal University of Alagoas. Handroanthus albus (Cham.) Mattos seedlings were used, acquired from the nursery of the Institute for the preservation of the Atlantic Forest located at Usina Utinga Leão, municipality of Rio Largo – AL. The experimental design was completely randomized, consisting of four treatments (Control (CR) and Irrigation Cycles of three (3D), six (6D) and nine (9D) days) with four replications. The seedlings were 90 days old and biometric assessments were carried out weekly, measuring stem diameter, plant height and counting the number of leaves, until the experiment was dismantled. The stem diameter was measured at the marked location, and an MTX-316119 digital caliper was used for the assessments. The height of the plant was measured with the aid of a measuring tape, from the base to the apical bud of the seedling, the leaves were counted when fully expanded, biomass allocation consists of removing all parts of the plant, where they are weighed fresh and dry, To quantify the photosassimilides, 0.1 of the leaf blade of the treatments was removed and placed in tubes with alcohol and subsequently read using a spectrophotometer. water and placed in the refrigerator, weighed, turgid and then dried. The data obtained were subjected to analysis of variance, using the Sisvar software. The means were compared with each other using the Tukey test. It was observed that the number of leaves was directly affected, consequently the plants deepened their root system, reduced the specific leaf area and the accumulation of photosynthetic chlorophyll pigments, indicating that the applied stress affects the production of this pigment. In general, yellow ipê seedlings can survive for 9 days in a summer period without severely altering their survival and development.