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In order to find the optimum effect of fertilizer ratio N, P, K on bulb quality and quantity characteristics of tulip cv: hybrid darwin Apledoorn, experiments were conducted in a randomized complete block design using different fertilizer treatments. In those experiments, 3-year tulip Apledoorn bulbs were planted in pots containing sandy loam soil. The following treatments were applied through hydroponics method: ¬1-Control, solution No.1 with N,P,K (6, 1.6 and 2.6 meq/l), 2- solution No.2 with N,P,K (6, 4.05 and 2.6 meq/l), 3- solution No.3 with N,P,K (6, 4.05, 4.6 meq/l), and 4- solution No.4 with N,P,K (6.25, 1.6 and 4.6 meq/l). At the end of vegetative growth and when the leaves were dried, bulb diameter, wet & dried weight, proteins content, N, P, and K content of bulbs were found out, and the data statistically analyzed. Results revealed that among performed treatments the nutritional solution No.3 with respective N, P, K of 6, 4.05, 4.6 meq/l) increased bulb size, proteins contents and bulblet number in tulip (p<1%).