Studies on N, P. K fertilization of Gladiolus (Gladiolus grandiflorus, cv. 'Perusi'). At the Agricultural Cooperative of Holambra, Jaguariúna SP, experiments with gladiolus were conducted with the objective of studying the effects of increasing dosis of N, R and K on the floral stems and corms production. The response of gladiolus to nitrogen, phosphorus and potassium varied with the size of the corm that was planted. The effects of each nutrient on several characteristics of plants are discussed.