(1)
Cogo, C. M.; Andriolo, J. L.; Bisognin, D. A.; Godoi, R. dos S.; Bortolotto, O. C.; da Luz, G. L. Nitrogen-Potassium Relationship for Diagnosis of Plant Nutritional Status and Fertilization of the Potato Crop. PAB 2006, 41 (12), 1781-1786. https://doi.org/10.1590/S1678-3921.pab2006.v41.7345.