Borkert, Clóvis Manuel, Gedi Jorge Sfredo, José Renato Bouças Farias, César de Castro, Claudio Luis Spoladori, and Fábio Tutida. “Residual Effect of Potassium Fertilization Applied to Soybean in Three Different Oxisols”. Pesquisa Agropecuaria Brasileira 32, no. 12 (December 1, 1997): 1227–1234. Accessed March 27, 2026. https://apct.sede.embrapa.br/pab/article/view/4779.