Iturrieta Rojas, A.; Neptune, A. M. L. Effect of Macronutrients and Iron Upon the Growth and Mineral Composition of Castor Bean (Ricinus Communis L.) Cultivated in Nutrient Solution . An. Esc. Super. Agr. Luiz de Queiroz 1971, 28, 31-67. https://doi.org/10.1590/S0071-12761971000100002.