(1)
Borkert, C. M.; Sfredo, G. J.; Farias, J. R. B.; Castro, C. de; Spoladori, C. L.; Tutida, F. Residual Effect of Potassium Fertilization Applied to Soybean in Three Different Oxisols. PAB 1997, 32 (12), 1227-1234. https://doi.org/10.1590/S1678-3921.pab1997.v32.4779.