Junior, J.L. et al. 2005. Deficiencies of macronutrients on nutritional status of castor bean cultivar Iris. Pesquisa Agropecuaria Brasileira. 40, 2 (Feb. 2005), 145–151. DOI:https://doi.org/10.1590/S1678-3921.pab2005.v40.6935.