Turchetto, Felipe creator Araujo, Maristela Machado creator Tabaldi, Luciane Almeri creator Griebeler, Adriana Maria creator Berghetti, Álvaro Luís Pasquetti creator Rorato, Daniele Guarienti creator Barbosa, Felipe Manzoni creator Sasso, Victória Martini creator text periodical abstract or summary bl. continuing eng Abstract In forest nurseries, one of the factors that change the growth and quality of seedlings is water supply, which has a direct influence on metabolic processes such as stomatal conductance and photochemical efficiency of photosystem II. This study aims to identify the influence of different watering regimes as well as the use of a water-retaining polymer on the initial growth and metabolic processes of Enterolobium contortisiliquum seedlings. The experimental design was in random blocks with a factorial scheme. Morphological attributes, as well as physiological and biochemical attributes were investigated. We verified that the performance of E. contortisiliquum seedlings depends on the watering regime provided to the plants; furthermore, up to 60 days after the application of the treatments, both the height and diameter of the collection and the leaf water potential were similar in the water regimes of 8 mm day-1 and 12 mm day-1. Keywords: abiotic stress, water potential, oxidative stress, antioxidant enzymes. Publicação on-line; 49 ref.; 2 tables; 5 illus.; Summary (En) POTENCIAL HÍDRICO ENZIMA IRRIGAÇÃO ENTEROLOBIUM CONTORTISILIQUUM Rio de Janeiro-RJ Instituto de Florestas - UFRRJ 1994 2025-0456 1415-0980 / ISSN 2179-8087 0nline BR2026001237 v. 27(2) p. 1-11; (2020) https://www.scielo.br/j/floram/a/7TFKyB8VctXpHxDt3QMTScg/?format=pdf&lang=en https://www.scielo.br/j/floram/a/7TFKyB8VctXpHxDt3QMTScg/?format=pdf&lang=en BR-BrBNA 260519 20260519133321.0 eng