Cogo, Clarissa Melo, Jerônimo Luiz Andriolo, Dilson Antônio Bisognin, Rodrigo dos Santos Godoi, Orcial Ceolin Bortolotto, and Gean Lopes da Luz. 2006. “Nitrogen-Potassium Relationship for Diagnosis of Plant Nutritional Status and Fertilization of the Potato Crop”. Pesquisa Agropecuaria Brasileira 41 (12):1781-86. https://doi.org/10.1590/S1678-3921.pab2006.v41.7345.