Landgraf, P.R.C. et al. 2015. Nutrient content and gas exchange in calla lily plants grown in a hydroponic system. Pesquisa Agropecuaria Brasileira. 50, 11 (Dec. 2015), 1027–1032. DOI:https://doi.org/10.1590/S1678-3921.pab2015.v50.21659.