Fageria, N.K. et al. 2014. Iron nutrition of plants: an overview on the chemistry and physiology of its deficiency and toxicity. Pesquisa Agropecuaria Brasileira. 25, 4 (Apr. 2014), 553–570. DOI:https://doi.org/10.1590/S1678-3921.pab1990.v25.13454.