The present work tried to determine the effects of three sites of application of nitrogenous fertilizers as well as the effects of two differents sources of nitrogen on the flowers, conns and cormels productions o Gladiolus grandiflorus L., cv. 'Perusi' cultivated in podzolic soil. All the necessary cultural treatments were given to the plants. Nitrogen applied at planting time has no effect on the plant growth. Its localization in furrows near the root system helps in increasing corn and cormels production. The ammoniacal form permits a better use of nitrogen, influencing the production of floral stems, number of floral buds per stem, higher number and weight of corais. The sodium nitrate causes a despersion in the harvest of the floral stems, while the ammonium sulphate tends to concentrate it.