Pereira, José Ribamar, and Gilberto Gomes Cordeiro. 2014. “Effect of Irrigation and Fertilization on Some Chemical Characteristics of a Vertisol”. Pesquisa Agropecuaria Brasileira 22 (6):627-33. https://doi.org/10.1590/S1678-3921.pab1987.v22.14988.