A study was made to clarify the problem “nutri-tion and blindness” in gladiolus. According to the design showh in Table 1. three corms each of Spot-light variety (average weight 25. 7g) were planted in sand in Wagners pots on May 26, 1958 and nutritional treatments were made from June 17 to September 13 at 3 day intervals during the course of experiments. Samplings for the chemical analysis were made at the time of flowering, August 21, and at the time of digging, November 5, 1958. Date of flowering, height of plants, number of leaves, and number of florets were recorded at flowering time. Fresh wegihts of tops, of new corms, and of cormels, and number of cormels were measured at digging time. The results obtained are summarized as follows: 1. No significant differences were observed in percentage of flowering, height of plants, number of leaves, and number of florets, even though there were a few blind stalks in -N and several other plots. 2. Earlier flowering was observed in the plots treated with N 200_??_100 ppm and P 50 ppm, and later flowering in -N plots. 3. The color of leaves in the plots supplied with N 50 ppm or -N was yellowish-green, which clearly showed the N deficient symptom, and these plants. showed weaker growth than the others. In the plots: of N 200ppm, the color of leaves showed dark greenb and the plants looked vigorous, but the color of roots: was dark brown and the development of root system, was poor. 4. Fresh weight of tops and of new corms were increased with an increase of nitrogen. 5. Number of cormels was increased in the plots-supplied with low level nitrogen, and decreased remarkably in N 200ppm plots. There was no significant difference in the fresh weight of cormels. 6. Absorption of nitrogen increased with increas-ing of nitrogen supply regardless of application ra-tes of phosphorus or potassium. With increasing of phosphorus increased not only P absorption but also N absorption, except the plot supplied with phos-phorus alone. With increasing potassium increasedi K absorption-slightly when it was supplied with P 25_??_50 ppm or N 100 ppm, and decreased when it was supplied with N 200 ppm. 7. From the results mentioned above, it seemss that nitrogen has a strong relation to flowering in gladiolus, and the optimum of nitrogen application in flowering is 100 ppm. And phosphorus promotes. the effect of nitrogen.