Palhano, J. B., Muzilli, O., Igue, K., Garcia, A., & Sfredo, G. J. (2014). The use of phosphate and potassium fertilizers in soybean culture in the State of Paraná, Brazil. Pesquisa Agropecuaria Brasileira, 18(4), 357–362. https://doi.org/10.1590/S1678-3921.pab1983.v18.15241