Carvalho, L.M. de et al. 2020. Yield and photosynthetic attributes of sunflower cultivars grown under supplemental irrigation in the semiarid region of the Brazilian Northeast. Pesquisa Agropecuaria Brasileira. 55, X (Aug. 2020), e01715. DOI:https://doi.org/10.1590/S1678-3921.pab2020.v55.26730.