Minato, E. A.; Esper Neto, M.; Sakurada, R. L.; Inoue, T. T.; Batista, M. A. Foliar Macronutrient Contents and Maize (Zea Mays L.) Production in Response to Gypsum Application in an Oxisol. Rev. Sci. Agr. Paranaensis 2017, 16, 219-224.