Almeida, E.P. de, Freire, A.L. de O., Bakke, I.A. e Ferreira, C.D. 2021. Gas exchange and water use efficiency in seedlings of tree species from caatinga under water levels and potassium. Revista Principia. 1, 53 (fev. 2021), 218–230. DOI:https://doi.org/10.18265/1517-0306a2020v1n53p218-230.