Cuchiara, C.C. et al. 2015. Physiological responses of sweet potato (Ipomoea batatas L.) plants due to different copper concentrations. Semina: Ciências Agrárias. 36, 6Supl2 (Dec. 2015), 4165–4176. DOI:https://doi.org/10.5433/1679-0359.2015v36n6Supl2p4165.