Díaz, M. I. H.; Laffita, M. C.; Placeres, V. M.; Veloz, A. O.; Pulido, J. M. S.; Guerrero, O. B. Nitrogen-potassium ratios in fertirrigation for protected cultivation of tomato in Red Ferralitic soil. PAB 2010, 44 (5), 429-436. https://doi.org/10.1590/S1678-3921.pab2009.v44.1917.