Nitrogen supply to the plant increases the rate of metabolism where more carbohydrate is synthesized. This in turn increases the bulb weight and total yield as confirmed by the results of Amin, Rahim, and Hashem (1995) who reported that 100 kg N he-1 resulted in maximum yield. Conversely, minimum yield was recorded in the control plot (Table 4); which could be due to low fertility status of the original soil indicating a need for balanced fertilization. Accordingly, higher yield of garlic was observed in plots fertilized with N, P, S, and Zn fertilizers over the others (Table 4). The possible justification for this higher result could be due to combined effect of the contributions of nitrogen to chlorophyll, enzymes, and proteins synthesis; as phosphorus is essential for root growth, phospho-proteins and phospho-lipids. The diameter and weight of bulbs were significantly improved with the application of S up to 24 kg/ha. It also might be due to adequate nutrient supply which favored the enlargement of bulb and its weight. The result was in conformity with the findings of Nasiruddin, Farooque, and Baten (1993) that reported the application of both potassium and sulfur either individually or in combined increased plant height, number of leaves, bulb diameter, bulb weight and bulb yield. Balasubramonium, Raman, and Moorty (1979) studied that the added S had positive effect in increasing the yield of onion but a reduction in yield with very high dose of S was also observed.